[jboss-jira] [JBoss JIRA] (JBRULES-3687) Provide detailed context information for java.lang.NullPointerException at org.drools.reteoo.RightTuple.unlinkFromRightParent(RightTuple.java:70)

Friday, 16 November 2012

     [
https://issues.jboss.org/browse/JBRULES-3687?page=com.atlassian.jira.plug...
]

Hendy Irawan updated JBRULES-3687:
----------------------------------

    Description: 
We're using Drools 5.5.0 in OSGi with: Karaf 2.3.0, Pax Wicket 1.1.1.

We experience several issues and this is one of them. Even if a fix is not in sight,
I'd appreciate if a null check with more detailed information can be provided at the
exception point, which will be helpful for us to diagnose and for future bug report to
Drools team.

Stack:

{code}
java.lang.NullPointerException
     at org.drools.reteoo.RightTuple.unlinkFromRightParent(RightTuple.java:70)
     at org.drools.reteoo.FromNode.unlinkCreatedHandles(FromNode.java:393)
     at org.drools.reteoo.FromNode.retractLeftTuple(FromNode.java:379)
     at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:290)
     at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:354)
     at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:568)
     at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:936)
     at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:924)
     at
org.drools.impl.StatefulKnowledgeSessionImpl.retract(StatefulKnowledgeSessionImpl.java:273)
     at
id.co.bippo.booking.BookingCheckRulesImpl.processBookings(BookingCheckRulesImpl.java:185)
     at
id.co.bippo.booking.BookingCheckRulesImpl.processFacts(BookingCheckRulesImpl.java:195)
     at id.co.bippo.booking.BookingCheckRulesImpl.check(BookingCheckRulesImpl.java:147)
     at
id.co.bippo.booking.web.ProductBookingPanel.<init>(ProductBookingPanel.java:47)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
     at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
     at
org.ops4j.pax.wicket.internal.FilterDelegator$Chain.doFilter(FilterDelegator.java:79)
     at
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
     at
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
     at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
     at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
     at
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
     at
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
     at
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
     at
org.ops4j.pax.wicket.internal.FilterDelegator$Chain.doFilter(FilterDelegator.java:77)
     at org.ops4j.pax.wicket.internal.FilterDelegator.doFilter(FilterDelegator.java:61)
     at
org.ops4j.pax.wicket.internal.ServletProxy$ServletInvocationHandler.invoke(ServletProxy.java:72)
     at $Proxy80.service(Unknown Source)
     at java.lang.reflect.Method.invoke(Method.java:601)
     at
org.ops4j.pax.web.service.internal.HttpServiceStarted$2.invoke(HttpServiceStarted.java:210)
     at org.ops4j.pax.web.service.internal.$Proxy0.service(Unknown Source)
     at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:652)
     at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:447)
     at
org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:70)
     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
     at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:559)
     at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
     at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1038)
     at
org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:117)
     at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:374)
     at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
     at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:972)
     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
     at
org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:74)
     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
     at org.eclipse.jetty.server.Server.handle(Server.java:363)
     at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:483)
     at
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
     at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:920)
     at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:982)
     at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
     at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
     at
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
     at
org.eclipse.jetty.server.nio.BlockingChannelConnector$BlockingChannelEndPoint.run(BlockingChannelConnector.java:298)
     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
     at java.lang.Thread.run(Thread.java:722)

Complete stack:

java.lang.RuntimeException: Cannot create component
id.co.bippo.booking.web.ProductBookingPanel for contributor
id.co.bippo.product.web.pub.ProductView/addToCartRegion from id.co.bippo.booking.web
[3478]
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:189)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

java.lang.RuntimeException: Error during booking check CheckProduct
[bookability=OUT_OF_STOCK, confirmability=OUT_OF_STOCK, message=Maaf, produk zibalabel_t05
tidak tersedia saat ini, getPersonId()=arum_puspita, getProductId()=zibalabel_t05,
getQty()=1.0]
     at id.co.bippo.booking.BookingCheckRulesImpl.check(BookingCheckRulesImpl.java:151)
     at
id.co.bippo.booking.web.ProductBookingPanel.<init>(ProductBookingPanel.java:47)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
{code}

Bundles:

{code}
[3016] [Active     ] [            ] [       ] [   80] id.co.bippo.booking.rs
(5.0.0.SNAPSHOT)
[3017] [Active     ] [            ] [       ] [   80] id.co.bippo.booking
(5.0.0.SNAPSHOT)
[3173] [Active     ] [            ] [Started] [   80] berbatik_booking.xml (0.0.0)
[3192] [Active     ] [            ] [Started] [   80] berbatik_booking.rs.xml (0.0.0)
[3295] [Active     ] [            ] [       ] [   50] org.drools.api (5.5.0.Final)
[3296] [Active     ] [            ] [       ] [   50] org.drools.internalapi
(5.5.0.Final)
[3297] [Active     ] [            ] [       ] [   50] org.drools.core (5.5.0.Final)
[3298] [Active     ] [            ] [       ] [   50] org.drools.compiler (5.5.0.Final)
[3299] [Active     ] [            ] [       ] [   50] org.drools.templates (5.5.0.Final)
[3478] [Active     ] [Created     ] [       ] [   80] id.co.bippo.booking.web
(5.0.0.SNAPSHOT)
{code}

DRL:

{code}
package id.co.bippo.booking
dialect "mvel"

import org.slf4j.Logger;
import org.joda.time.*;
import id.co.bippo.booking.*;
import id.co.bippo.booking.CheckProduct.Bookability;
import id.co.bippo.booking.CheckProduct.Confirmability;
import id.co.bippo.person.*;
import id.co.bippo.product.util.ProductUtils;

global Logger log;
global BookingDao bookingDao;
global ProductUtils productUtils;
global PersonUtils personUtils;

rule "Cek booking produk dengan qty 1, stock ada"
activation-group "Check"
	when
		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty
== 1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty    : Double() from bookingDao.findBookedQty($productId)
		$availableQty : Double(this - $bookedQty >= $qty) from
productUtils.getQtyByProductId($productId)
		$countBook 	  : Long(this < 100) from
bookingDao.getBookCountByPersonIdToday($personId)
	then
		log.info("{} boleh booking {} sebanyak {} (stok tersedia: {}, sudah dibooking:
{})",
			{$personId, $productId, $qty, $availableQty, $bookedQty});
		modify($action) {
			setBookability(CheckProduct$Bookability.AVAILABLE),
			setConfirmability(CheckProduct$Confirmability.AVAILABLE),
			setMessage("Anda boleh melakukan booking untuk produk "+ $productId +",
Terima Kasih")
		}
end

rule "Check booking yang melebihi batas yang telah ditentukan, batas booking 3 per 24
jam" 
activation-group "Check"
	when
		$action 	   : CheckProduct( $personId : personId, $productId : productId, $qty : qty ==
1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$countBook     : Long(this >= 100) from
bookingDao.getBookCountByPersonIdToday($personId)
	then
		log.info("Person ID {} telah melakukan booking product sebanyak {}",
{$personId, $countBook});
		modify($action) {
			setBookability(CheckProduct$Bookability.QUOTA_EXCEEDED), 
			setConfirmability(CheckProduct$Confirmability.QUOTA_EXCEEDED),
			setMessage("Sorry, Cannot book product currently, you have too many bookings
today");
		}
end

rule "Check if product is already booked by himself (BookingDetail status:
open/pending/waiting)."
activation-group "Check"
salience 15
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
    	$bookingDetail  : BookingDetail(booking.personId == $personId, productId ==
$productId, qty == $qty,
    						/*status in (BookingDetail$Status.OPEN, BookingDetail$Status.PENDING_WAITING)
)*/ 
    						status == BookingDetail$Status.OPEN)
    then
		log.info("{} sudah booking {} sebanyak {}, tinggal diorder",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.ALREADY_SELF),
			setConfirmability(CheckProduct$Confirmability.PLEASE_PAY_TO_ORDER),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($personId + " sudah booking " + $productId " sebanyak "
+ $qty + ", tinggal diorder")
		}
end

rule "Check if product is already confimed by himself (BookingDetail status:
pending_waiting)."
activation-group "Check"
salience 15
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
    	$bookingDetail  : BookingDetail(booking.personId == $personId, productId ==
$productId, qty == $qty,
    						status == BookingDetail$Status.PENDING_WAITING)
    then
		log.info("{} sudah booking {} sebanyak {}, tinggal diorder",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.ALREADY_SELF),
			setConfirmability(CheckProduct$Confirmability.PLEASE_PAY_TO_WAIT),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($personId + " sudah booking " + $productId " sebanyak "
+ $qty + ", tinggal diorder")
		}
end

rule "Check: Product already booked by other, AND already confirmed by yet
another."
activation-group "Check"
salience 20
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty      : Double(this >= 1.0) from bookingDao.findBookedQty($productId)
    	$bookingDetail  : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
    						status == BookingDetail$Status.OPEN)
    	$bookingDetail2 : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
    						status == BookingDetail$Status.PENDING_WAITING)
    then
		log.info("{} ingin booking {} sebanyak {} tapi sudah dibooking dan diconfirm 2
orang",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.BOOKED_BY_OTHER),
			setConfirmability(CheckProduct$Confirmability.CONFIRMED_BY_OTHER),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($productId + " sudah dibooking dan diconfirm 2 orang customer
lain.")
		}
end

rule "Check the product, but the product was booked by other."
activation-group "Check"
salience 10
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty      : Double(this >= 1.0) from bookingDao.findBookedQty($productId)
    	$bookingDetail  : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
    						status == BookingDetail$Status.OPEN)
    then
		log.info("{} ingin booking {} sebanyak {} tapi sudah dibooking orang, mau confirm
dan nunggu ngga?",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.BOOKED_BY_OTHER),
			setConfirmability(CheckProduct$Confirmability.MUST_CONFIRM_WAITING),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($productId + " sudah dibooking customer lain, silahkan untuk confirm
waiting list.")
		}
end

rule "Cek booking produk dengan qty 1, stock habis"
activation-group "Check"
	when
		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty
== 1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty    : Double() from bookingDao.findBookedQty($productId)
		$availableQty : Double(this - $bookedQty < $qty) from
productUtils.getQtyByProductId($productId)
	then
		log.info("{} tidak bisa booking {} sebanyak {} karena stok tidak cukup. Stok
sekarang: {}, sudah dibooking orang: {}",
			{$personId, $productId, $qty, $availableQty, $bookedQty});
		modify($action) {
			setBookability(CheckProduct$Bookability.OUT_OF_STOCK),
			setConfirmability(CheckProduct$Confirmability.OUT_OF_STOCK),
			setMessage("Maaf, produk "+ $productId + " tidak tersedia saat
ini")
		}
end

rule "Check booking produk dengan qty bukan 1"
activation-group "Check"
	when
		$action : CheckProduct( $personId : personId, $productId : productId, $qty : qty !=
1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
	then
		log.info("{} booking {} sebanyak {}. Tidak boleh! Qty harus 1",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.INVALID),
			setConfirmability(CheckProduct$Confirmability.INVALID),
			setMessage("Booking qty harus 1") 
		}
end
 /*
rule "Minta booking produk, tapi tidak ada ada stock"
activation-group "Check"
salience -10
	when
		$action 	   : CheckProduct( $personId : personId, $productId : productId, $qty : qty,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		Double(this == null) from stockSvc.getAvailableQtyByProductId($productId)
	then
		log.info("{} booking {} sebanyak {}. Maaf stock tidak terdaftar!",
			{$personId, $productId, $qty});
		modify($action) {
			setMessage("Stock produk " + $productId + " tidak terdaftar"),
			setBookability(Bookability.NO_STOCK_DATA),
			setConfirmability(Confirmability.NO_STOCK_DATA)
		}
end
*/
rule "Minta booking produk... tak ada kriteria lain yang matching (unhandled
case)"
activation-group "Check"
salience -100
	when
		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
	then
		log.warn("{} minta booking {} sebanyak {}, tapi tidak ada rule yang
matching",
			{$personId, $productId, $qty});
		modify($action) {
			setMessage("Internal error: " + $personId + " check booking " +
$productId +
				" sebanyak " + $qty + " namun tidak ada rule yang match. " +
				" Mohon laporkan ke customer support."),
			setBookability(CheckProduct$Bookability.ERROR),
			setConfirmability(CheckProduct$Confirmability.ERROR)
		}
end
{code}

  was:
We're using Drools 5.5.0 in OSGi with: Karaf 2.3.0, Pax Wicket 1.1.1.

We experience several issues and this is one of them. Even if a fix is not in sight,
I'd appreciate if a null check with more detailed information can be provided at the
exception point, which will be helpful for us to diagnose and for future bug report to
Drools team.

Stack:

{code}
java.lang.NullPointerException
     at org.drools.reteoo.RightTuple.unlinkFromRightParent(RightTuple.java:70)
     at org.drools.reteoo.FromNode.unlinkCreatedHandles(FromNode.java:393)
     at org.drools.reteoo.FromNode.retractLeftTuple(FromNode.java:379)
     at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:290)
     at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:354)
     at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:568)
     at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:936)
     at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:924)
     at
org.drools.impl.StatefulKnowledgeSessionImpl.retract(StatefulKnowledgeSessionImpl.java:273)
     at
id.co.bippo.booking.BookingCheckRulesImpl.processBookings(BookingCheckRulesImpl.java:185)
     at
id.co.bippo.booking.BookingCheckRulesImpl.processFacts(BookingCheckRulesImpl.java:195)
     at id.co.bippo.booking.BookingCheckRulesImpl.check(BookingCheckRulesImpl.java:147)
     at
id.co.bippo.booking.web.ProductBookingPanel.<init>(ProductBookingPanel.java:47)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
     at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
     at
org.ops4j.pax.wicket.internal.FilterDelegator$Chain.doFilter(FilterDelegator.java:79)
     at
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
     at
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
     at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
     at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
     at
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
     at
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
     at
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
     at
org.ops4j.pax.wicket.internal.FilterDelegator$Chain.doFilter(FilterDelegator.java:77)
     at org.ops4j.pax.wicket.internal.FilterDelegator.doFilter(FilterDelegator.java:61)
     at
org.ops4j.pax.wicket.internal.ServletProxy$ServletInvocationHandler.invoke(ServletProxy.java:72)
     at $Proxy80.service(Unknown Source)
     at java.lang.reflect.Method.invoke(Method.java:601)
     at
org.ops4j.pax.web.service.internal.HttpServiceStarted$2.invoke(HttpServiceStarted.java:210)
     at org.ops4j.pax.web.service.internal.$Proxy0.service(Unknown Source)
     at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:652)
     at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:447)
     at
org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:70)
     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
     at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:559)
     at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
     at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1038)
     at
org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:117)
     at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:374)
     at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
     at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:972)
     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
     at
org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:74)
     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
     at org.eclipse.jetty.server.Server.handle(Server.java:363)
     at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:483)
     at
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
     at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:920)
     at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:982)
     at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
     at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
     at
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
     at
org.eclipse.jetty.server.nio.BlockingChannelConnector$BlockingChannelEndPoint.run(BlockingChannelConnector.java:298)
     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
     at java.lang.Thread.run(Thread.java:722)

Complete stack:

java.lang.RuntimeException: Cannot create component
id.co.bippo.booking.web.ProductBookingPanel for contributor
id.co.bippo.product.web.pub.ProductView/addToCartRegion from id.co.bippo.booking.web
[3478]
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:189)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

java.lang.RuntimeException: Error during booking check CheckProduct
[bookability=OUT_OF_STOCK, confirmability=OUT_OF_STOCK, message=Maaf, produk zibalabel_t05
tidak tersedia saat ini, getPersonId()=arum_puspita, getProductId()=zibalabel_t05,
getQty()=1.0]
     at id.co.bippo.booking.BookingCheckRulesImpl.check(BookingCheckRulesImpl.java:151)
     at
id.co.bippo.booking.web.ProductBookingPanel.<init>(ProductBookingPanel.java:47)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
     at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
     at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
     at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
     at org.apache.wicket.Component.fireInitialize(Component.java:933)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
     at org.apache.wicket.Component.render(Component.java:2313)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
     at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
     at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
     at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
     at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
     at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
     at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
{code}

DRL:

{code}
package id.co.bippo.booking
dialect "mvel"

import org.slf4j.Logger;
import org.joda.time.*;
import id.co.bippo.booking.*;
import id.co.bippo.booking.CheckProduct.Bookability;
import id.co.bippo.booking.CheckProduct.Confirmability;
import id.co.bippo.person.*;
import id.co.bippo.product.util.ProductUtils;

global Logger log;
global BookingDao bookingDao;
global ProductUtils productUtils;
global PersonUtils personUtils;

rule "Cek booking produk dengan qty 1, stock ada"
activation-group "Check"
	when
		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty
== 1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty    : Double() from bookingDao.findBookedQty($productId)
		$availableQty : Double(this - $bookedQty >= $qty) from
productUtils.getQtyByProductId($productId)
		$countBook 	  : Long(this < 100) from
bookingDao.getBookCountByPersonIdToday($personId)
	then
		log.info("{} boleh booking {} sebanyak {} (stok tersedia: {}, sudah dibooking:
{})",
			{$personId, $productId, $qty, $availableQty, $bookedQty});
		modify($action) {
			setBookability(CheckProduct$Bookability.AVAILABLE),
			setConfirmability(CheckProduct$Confirmability.AVAILABLE),
			setMessage("Anda boleh melakukan booking untuk produk "+ $productId +",
Terima Kasih")
		}
end

rule "Check booking yang melebihi batas yang telah ditentukan, batas booking 3 per 24
jam" 
activation-group "Check"
	when
		$action 	   : CheckProduct( $personId : personId, $productId : productId, $qty : qty ==
1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$countBook     : Long(this >= 100) from
bookingDao.getBookCountByPersonIdToday($personId)
	then
		log.info("Person ID {} telah melakukan booking product sebanyak {}",
{$personId, $countBook});
		modify($action) {
			setBookability(CheckProduct$Bookability.QUOTA_EXCEEDED), 
			setConfirmability(CheckProduct$Confirmability.QUOTA_EXCEEDED),
			setMessage("Sorry, Cannot book product currently, you have too many bookings
today");
		}
end

rule "Check if product is already booked by himself (BookingDetail status:
open/pending/waiting)."
activation-group "Check"
salience 15
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
    	$bookingDetail  : BookingDetail(booking.personId == $personId, productId ==
$productId, qty == $qty,
    						/*status in (BookingDetail$Status.OPEN, BookingDetail$Status.PENDING_WAITING)
)*/ 
    						status == BookingDetail$Status.OPEN)
    then
		log.info("{} sudah booking {} sebanyak {}, tinggal diorder",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.ALREADY_SELF),
			setConfirmability(CheckProduct$Confirmability.PLEASE_PAY_TO_ORDER),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($personId + " sudah booking " + $productId " sebanyak "
+ $qty + ", tinggal diorder")
		}
end

rule "Check if product is already confimed by himself (BookingDetail status:
pending_waiting)."
activation-group "Check"
salience 15
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
    	$bookingDetail  : BookingDetail(booking.personId == $personId, productId ==
$productId, qty == $qty,
    						status == BookingDetail$Status.PENDING_WAITING)
    then
		log.info("{} sudah booking {} sebanyak {}, tinggal diorder",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.ALREADY_SELF),
			setConfirmability(CheckProduct$Confirmability.PLEASE_PAY_TO_WAIT),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($personId + " sudah booking " + $productId " sebanyak "
+ $qty + ", tinggal diorder")
		}
end

rule "Check: Product already booked by other, AND already confirmed by yet
another."
activation-group "Check"
salience 20
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty      : Double(this >= 1.0) from bookingDao.findBookedQty($productId)
    	$bookingDetail  : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
    						status == BookingDetail$Status.OPEN)
    	$bookingDetail2 : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
    						status == BookingDetail$Status.PENDING_WAITING)
    then
		log.info("{} ingin booking {} sebanyak {} tapi sudah dibooking dan diconfirm 2
orang",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.BOOKED_BY_OTHER),
			setConfirmability(CheckProduct$Confirmability.CONFIRMED_BY_OTHER),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($productId + " sudah dibooking dan diconfirm 2 orang customer
lain.")
		}
end

rule "Check the product, but the product was booked by other."
activation-group "Check"
salience 10
    when
    	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
    						bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty      : Double(this >= 1.0) from bookingDao.findBookedQty($productId)
    	$bookingDetail  : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
    						status == BookingDetail$Status.OPEN)
    then
		log.info("{} ingin booking {} sebanyak {} tapi sudah dibooking orang, mau confirm
dan nunggu ngga?",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.BOOKED_BY_OTHER),
			setConfirmability(CheckProduct$Confirmability.MUST_CONFIRM_WAITING),
			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
			setMessage($productId + " sudah dibooking customer lain, silahkan untuk confirm
waiting list.")
		}
end

rule "Cek booking produk dengan qty 1, stock habis"
activation-group "Check"
	when
		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty
== 1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		$bookedQty    : Double() from bookingDao.findBookedQty($productId)
		$availableQty : Double(this - $bookedQty < $qty) from
productUtils.getQtyByProductId($productId)
	then
		log.info("{} tidak bisa booking {} sebanyak {} karena stok tidak cukup. Stok
sekarang: {}, sudah dibooking orang: {}",
			{$personId, $productId, $qty, $availableQty, $bookedQty});
		modify($action) {
			setBookability(CheckProduct$Bookability.OUT_OF_STOCK),
			setConfirmability(CheckProduct$Confirmability.OUT_OF_STOCK),
			setMessage("Maaf, produk "+ $productId + " tidak tersedia saat
ini")
		}
end

rule "Check booking produk dengan qty bukan 1"
activation-group "Check"
	when
		$action : CheckProduct( $personId : personId, $productId : productId, $qty : qty !=
1.0,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
	then
		log.info("{} booking {} sebanyak {}. Tidak boleh! Qty harus 1",
			{$personId, $productId, $qty});
		modify($action) {
			setBookability(CheckProduct$Bookability.INVALID),
			setConfirmability(CheckProduct$Confirmability.INVALID),
			setMessage("Booking qty harus 1") 
		}
end
 /*
rule "Minta booking produk, tapi tidak ada ada stock"
activation-group "Check"
salience -10
	when
		$action 	   : CheckProduct( $personId : personId, $productId : productId, $qty : qty,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
		Double(this == null) from stockSvc.getAvailableQtyByProductId($productId)
	then
		log.info("{} booking {} sebanyak {}. Maaf stock tidak terdaftar!",
			{$personId, $productId, $qty});
		modify($action) {
			setMessage("Stock produk " + $productId + " tidak terdaftar"),
			setBookability(Bookability.NO_STOCK_DATA),
			setConfirmability(Confirmability.NO_STOCK_DATA)
		}
end
*/
rule "Minta booking produk... tak ada kriteria lain yang matching (unhandled
case)"
activation-group "Check"
salience -100
	when
		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty,
							bookability == Bookability.NEW,
							confirmability == Confirmability.NEW)
	then
		log.warn("{} minta booking {} sebanyak {}, tapi tidak ada rule yang
matching",
			{$personId, $productId, $qty});
		modify($action) {
			setMessage("Internal error: " + $personId + " check booking " +
$productId +
				" sebanyak " + $qty + " namun tidak ada rule yang match. " +
				" Mohon laporkan ke customer support."),
			setBookability(CheckProduct$Bookability.ERROR),
			setConfirmability(CheckProduct$Confirmability.ERROR)
		}
end
{code}

...
 Provide detailed context information for
java.lang.NullPointerException at
org.drools.reteoo.RightTuple.unlinkFromRightParent(RightTuple.java:70)

-------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: JBRULES-3687
                 URL: https://issues.jboss.org/browse/JBRULES-3687
             Project: Drools
          Issue Type: Bug
      Security Level: Public(Everyone can see) 
          Components: drools-core
    Affects Versions: 5.5.0.Final
         Environment: Karaf
   Karaf version               2.3.0
   Karaf home                  /home/ceefour/git/bippo-commerce5/karaf
   Karaf base                  /home/ceefour/git/bippo-commerce5/karaf
   OSGi Framework              org.apache.felix.framework - 4.0.3
 JVM
   Java Virtual Machine        OpenJDK 64-Bit Server VM version 23.2-b09
   Version                     1.7.0_07
   Vendor                      Oracle Corporation
   Uptime                      8 minutes
   Total compile time          44.295 seconds
 Threads
   Live threads                107
   Daemon threads              92
   Peak                        140
   Total started               322
 Memory
   Current heap size           203,385 kbytes
   Maximum heap size           466,048 kbytes
   Committed heap size         283,072 kbytes
   Pending objects             0
   Garbage collector           Name = 'PS Scavenge', Collections = 73, Time =
0.654 seconds
   Garbage collector           Name = 'PS MarkSweep', Collections = 2, Time =
0.366 seconds
 Classes
   Current classes loaded      15,546
   Total classes loaded        15,547
   Total classes unloaded      1
 Operating system
   Name                        Linux version 3.2.0-32-generic
   Architecture                amd64
   Processors                  8
            Reporter: Hendy Irawan
            Assignee: Mark Proctor

 We're using Drools 5.5.0 in OSGi with: Karaf 2.3.0, Pax Wicket 1.1.1.
 We experience several issues and this is one of them. Even if a fix is not in sight,
I'd appreciate if a null check with more detailed information can be provided at the
exception point, which will be helpful for us to diagnose and for future bug report to
Drools team.
 Stack:
 {code}
 java.lang.NullPointerException
      at org.drools.reteoo.RightTuple.unlinkFromRightParent(RightTuple.java:70)
      at org.drools.reteoo.FromNode.unlinkCreatedHandles(FromNode.java:393)
      at org.drools.reteoo.FromNode.retractLeftTuple(FromNode.java:379)
      at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:290)
      at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:354)
      at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:568)
      at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:936)
      at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:924)
      at
org.drools.impl.StatefulKnowledgeSessionImpl.retract(StatefulKnowledgeSessionImpl.java:273)
      at
id.co.bippo.booking.BookingCheckRulesImpl.processBookings(BookingCheckRulesImpl.java:185)
      at
id.co.bippo.booking.BookingCheckRulesImpl.processFacts(BookingCheckRulesImpl.java:195)
      at id.co.bippo.booking.BookingCheckRulesImpl.check(BookingCheckRulesImpl.java:147)
      at
id.co.bippo.booking.web.ProductBookingPanel.<init>(ProductBookingPanel.java:47)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
      at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
      at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
      at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
      at org.apache.wicket.Component.fireInitialize(Component.java:933)
      at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
      at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
      at org.apache.wicket.Component.render(Component.java:2313)
      at org.apache.wicket.Page.renderPage(Page.java:1035)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
      at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
      at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
      at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
      at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
      at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
      at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
      at
org.ops4j.pax.wicket.internal.FilterDelegator$Chain.doFilter(FilterDelegator.java:79)
      at
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
      at
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
      at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
      at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
      at
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
      at
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
      at
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
      at
org.ops4j.pax.wicket.internal.FilterDelegator$Chain.doFilter(FilterDelegator.java:77)
      at org.ops4j.pax.wicket.internal.FilterDelegator.doFilter(FilterDelegator.java:61)
      at
org.ops4j.pax.wicket.internal.ServletProxy$ServletInvocationHandler.invoke(ServletProxy.java:72)
      at $Proxy80.service(Unknown Source)
      at java.lang.reflect.Method.invoke(Method.java:601)
      at
org.ops4j.pax.web.service.internal.HttpServiceStarted$2.invoke(HttpServiceStarted.java:210)
      at org.ops4j.pax.web.service.internal.$Proxy0.service(Unknown Source)
      at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:652)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:447)
      at
org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:70)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
      at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:559)
      at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
      at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1038)
      at
org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:117)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:374)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:972)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
      at
org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:74)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
      at org.eclipse.jetty.server.Server.handle(Server.java:363)
      at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:483)
      at
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
      at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:920)
      at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:982)
      at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
      at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
      at
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
      at
org.eclipse.jetty.server.nio.BlockingChannelConnector$BlockingChannelEndPoint.run(BlockingChannelConnector.java:298)
      at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
      at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
      at java.lang.Thread.run(Thread.java:722)
 Complete stack:
 java.lang.RuntimeException: Cannot create component
id.co.bippo.booking.web.ProductBookingPanel for contributor
id.co.bippo.product.web.pub.ProductView/addToCartRegion from id.co.bippo.booking.web
[3478]
      at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:189)
      at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
      at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
      at org.apache.wicket.Component.fireInitialize(Component.java:933)
      at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
      at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
      at org.apache.wicket.Component.render(Component.java:2313)
      at org.apache.wicket.Page.renderPage(Page.java:1035)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
      at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
      at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
      at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
      at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
      at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
 java.lang.reflect.InvocationTargetException
      at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
      at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
      at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
      at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
      at org.apache.wicket.Component.fireInitialize(Component.java:933)
      at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
      at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
      at org.apache.wicket.Component.render(Component.java:2313)
      at org.apache.wicket.Page.renderPage(Page.java:1035)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
      at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
      at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
      at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
      at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
      at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
 java.lang.RuntimeException: Error during booking check CheckProduct
[bookability=OUT_OF_STOCK, confirmability=OUT_OF_STOCK, message=Maaf, produk zibalabel_t05
tidak tersedia saat ini, getPersonId()=arum_puspita, getProductId()=zibalabel_t05,
getQty()=1.0]
      at id.co.bippo.booking.BookingCheckRulesImpl.check(BookingCheckRulesImpl.java:151)
      at
id.co.bippo.booking.web.ProductBookingPanel.<init>(ProductBookingPanel.java:47)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
      at
org.soluvas.web.site.compose.impl.LiveChildContributorImpl$1.create(LiveChildContributorImpl.java:187)
      at org.soluvas.web.site.compose.ComposeUtils.compose(ComposeUtils.java:68)
      at org.soluvas.web.bootstrap.BootstrapPage.onInitialize(BootstrapPage.java:302)
      at org.apache.wicket.Component.fireInitialize(Component.java:933)
      at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:960)
      at org.apache.wicket.Page.internalPrepareForRender(Page.java:277)
      at org.apache.wicket.Component.render(Component.java:2313)
      at org.apache.wicket.Page.renderPage(Page.java:1035)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:115)
      at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
      at
org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
      at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
      at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
      at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
      at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
      at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
 {code}
 Bundles:
 {code}
 [3016] [Active     ] [            ] [       ] [   80] id.co.bippo.booking.rs
(5.0.0.SNAPSHOT)
 [3017] [Active     ] [            ] [       ] [   80] id.co.bippo.booking
(5.0.0.SNAPSHOT)
 [3173] [Active     ] [            ] [Started] [   80] berbatik_booking.xml (0.0.0)
 [3192] [Active     ] [            ] [Started] [   80] berbatik_booking.rs.xml (0.0.0)
 [3295] [Active     ] [            ] [       ] [   50] org.drools.api (5.5.0.Final)
 [3296] [Active     ] [            ] [       ] [   50] org.drools.internalapi
(5.5.0.Final)
 [3297] [Active     ] [            ] [       ] [   50] org.drools.core (5.5.0.Final)
 [3298] [Active     ] [            ] [       ] [   50] org.drools.compiler (5.5.0.Final)
 [3299] [Active     ] [            ] [       ] [   50] org.drools.templates (5.5.0.Final)
 [3478] [Active     ] [Created     ] [       ] [   80] id.co.bippo.booking.web
(5.0.0.SNAPSHOT)
 {code}
 DRL:
 {code}
 package id.co.bippo.booking
 dialect "mvel"
 import org.slf4j.Logger;
 import org.joda.time.*;
 import id.co.bippo.booking.*;
 import id.co.bippo.booking.CheckProduct.Bookability;
 import id.co.bippo.booking.CheckProduct.Confirmability;
 import id.co.bippo.person.*;
 import id.co.bippo.product.util.ProductUtils;
 global Logger log;
 global BookingDao bookingDao;
 global ProductUtils productUtils;
 global PersonUtils personUtils;
 rule "Cek booking produk dengan qty 1, stock ada"
 activation-group "Check"
 	when
 		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty
== 1.0,
 							bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 		$bookedQty    : Double() from bookingDao.findBookedQty($productId)
 		$availableQty : Double(this - $bookedQty >= $qty) from
productUtils.getQtyByProductId($productId)
 		$countBook 	  : Long(this < 100) from
bookingDao.getBookCountByPersonIdToday($personId)
 	then
 		log.info("{} boleh booking {} sebanyak {} (stok tersedia: {}, sudah dibooking:
{})",
 			{$personId, $productId, $qty, $availableQty, $bookedQty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.AVAILABLE),
 			setConfirmability(CheckProduct$Confirmability.AVAILABLE),
 			setMessage("Anda boleh melakukan booking untuk produk "+ $productId +",
Terima Kasih")
 		}
 end
 rule "Check booking yang melebihi batas yang telah ditentukan, batas booking 3 per
24 jam" 
 activation-group "Check"
 	when
 		$action 	   : CheckProduct( $personId : personId, $productId : productId, $qty : qty ==
1.0,
 							bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 		$countBook     : Long(this >= 100) from
bookingDao.getBookCountByPersonIdToday($personId)
 	then
 		log.info("Person ID {} telah melakukan booking product sebanyak {}",
{$personId, $countBook});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.QUOTA_EXCEEDED), 
 			setConfirmability(CheckProduct$Confirmability.QUOTA_EXCEEDED),
 			setMessage("Sorry, Cannot book product currently, you have too many bookings
today");
 		}
 end
 rule "Check if product is already booked by himself (BookingDetail status:
open/pending/waiting)."
 activation-group "Check"
 salience 15
     when
     	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
     						bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
     	$bookingDetail  : BookingDetail(booking.personId == $personId, productId ==
$productId, qty == $qty,
     						/*status in (BookingDetail$Status.OPEN, BookingDetail$Status.PENDING_WAITING)
)*/ 
     						status == BookingDetail$Status.OPEN)
     then
 		log.info("{} sudah booking {} sebanyak {}, tinggal diorder",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.ALREADY_SELF),
 			setConfirmability(CheckProduct$Confirmability.PLEASE_PAY_TO_ORDER),
 			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
 			setMessage($personId + " sudah booking " + $productId " sebanyak "
+ $qty + ", tinggal diorder")
 		}
 end
 rule "Check if product is already confimed by himself (BookingDetail status:
pending_waiting)."
 activation-group "Check"
 salience 15
     when
     	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
     						bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
     	$bookingDetail  : BookingDetail(booking.personId == $personId, productId ==
$productId, qty == $qty,
     						status == BookingDetail$Status.PENDING_WAITING)
     then
 		log.info("{} sudah booking {} sebanyak {}, tinggal diorder",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.ALREADY_SELF),
 			setConfirmability(CheckProduct$Confirmability.PLEASE_PAY_TO_WAIT),
 			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
 			setMessage($personId + " sudah booking " + $productId " sebanyak "
+ $qty + ", tinggal diorder")
 		}
 end
 rule "Check: Product already booked by other, AND already confirmed by yet
another."
 activation-group "Check"
 salience 20
     when
     	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
     						bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 		$bookedQty      : Double(this >= 1.0) from bookingDao.findBookedQty($productId)
     	$bookingDetail  : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
     						status == BookingDetail$Status.OPEN)
     	$bookingDetail2 : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
     						status == BookingDetail$Status.PENDING_WAITING)
     then
 		log.info("{} ingin booking {} sebanyak {} tapi sudah dibooking dan diconfirm 2
orang",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.BOOKED_BY_OTHER),
 			setConfirmability(CheckProduct$Confirmability.CONFIRMED_BY_OTHER),
 			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
 			setMessage($productId + " sudah dibooking dan diconfirm 2 orang customer
lain.")
 		}
 end
 rule "Check the product, but the product was booked by other."
 activation-group "Check"
 salience 10
     when
     	$action			: CheckProduct( $personId : personId, $productId: productId, $qty: qty ==
1.0,
     						bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 		$bookedQty      : Double(this >= 1.0) from bookingDao.findBookedQty($productId)
     	$bookingDetail  : BookingDetail(booking.personId != $personId, productId ==
$productId, qty == $qty, 
     						status == BookingDetail$Status.OPEN)
     then
 		log.info("{} ingin booking {} sebanyak {} tapi sudah dibooking orang, mau confirm
dan nunggu ngga?",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.BOOKED_BY_OTHER),
 			setConfirmability(CheckProduct$Confirmability.MUST_CONFIRM_WAITING),
 			setBooker(personUtils.getPersonRefById($bookingDetail.booking.personId)),
 			setMessage($productId + " sudah dibooking customer lain, silahkan untuk confirm
waiting list.")
 		}
 end
 rule "Cek booking produk dengan qty 1, stock habis"
 activation-group "Check"
 	when
 		$action       : CheckProduct( $personId : personId, $productId : productId, $qty : qty
== 1.0,
 							bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 		$bookedQty    : Double() from bookingDao.findBookedQty($productId)
 		$availableQty : Double(this - $bookedQty < $qty) from
productUtils.getQtyByProductId($productId)
 	then
 		log.info("{} tidak bisa booking {} sebanyak {} karena stok tidak cukup. Stok
sekarang: {}, sudah dibooking orang: {}",
 			{$personId, $productId, $qty, $availableQty, $bookedQty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.OUT_OF_STOCK),
 			setConfirmability(CheckProduct$Confirmability.OUT_OF_STOCK),
 			setMessage("Maaf, produk "+ $productId + " tidak tersedia saat
ini")
 		}
 end
 rule "Check booking produk dengan qty bukan 1"
 activation-group "Check"
 	when
 		$action : CheckProduct( $personId : personId, $productId : productId, $qty : qty !=
1.0,
 							bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 	then
 		log.info("{} booking {} sebanyak {}. Tidak boleh! Qty harus 1",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setBookability(CheckProduct$Bookability.INVALID),
 			setConfirmability(CheckProduct$Confirmability.INVALID),
 			setMessage("Booking qty harus 1") 
 		}
 end
  /*
 rule "Minta booking produk, tapi tidak ada ada stock"
 activation-group "Check"
 salience -10
 	when
 		$action 	   : CheckProduct( $personId : personId, $productId : productId, $qty : qty,
 							bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 		Double(this == null) from stockSvc.getAvailableQtyByProductId($productId)
 	then
 		log.info("{} booking {} sebanyak {}. Maaf stock tidak terdaftar!",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setMessage("Stock produk " + $productId + " tidak terdaftar"),
 			setBookability(Bookability.NO_STOCK_DATA),
 			setConfirmability(Confirmability.NO_STOCK_DATA)
 		}
 end
 */
 rule "Minta booking produk... tak ada kriteria lain yang matching (unhandled
case)"
 activation-group "Check"
 salience -100
 	when
 		$action       : CheckProduct( $personId : personId, $productId : productId, $qty :
qty,
 							bookability == Bookability.NEW,
 							confirmability == Confirmability.NEW)
 	then
 		log.warn("{} minta booking {} sebanyak {}, tapi tidak ada rule yang
matching",
 			{$personId, $productId, $qty});
 		modify($action) {
 			setMessage("Internal error: " + $personId + " check booking " +
$productId +
 				" sebanyak " + $qty + " namun tidak ada rule yang match. " +
 				" Mohon laporkan ke customer support."),
 			setBookability(CheckProduct$Bookability.ERROR),
 			setConfirmability(CheckProduct$Confirmability.ERROR)
 		}
 end
 {code} 
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[jboss-jira] [JBoss JIRA] (JBRULES-3687) Provide detailed context information for java.lang.NullPointerException at org.drools.reteoo.RightTuple.unlinkFromRightParent(RightTuple.java:70)