8:03 a.m.
Hi Edson,
thanx for answering, i've tried 4.0.3, but i get the following error when i
try to refresh my rules:
java.lang.IllegalArgumentException: Cannot remove a sink, when the list of
sinks is null
at org.drools.reteoo.ObjectSource.removeObjectSink(ObjectSource.java:116)
at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:192)
at
org.drools.reteoo.LeftInputAdapterNode.remove(LeftInputAdapterNode.java:189)
at org.drools.reteoo.BetaNode.remove(BetaNode.java:173)
at org.drools.reteoo.RuleTerminalNode.remove(RuleTerminalNode.java:466)
at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:224)
at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:270)
at org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:614)
at
org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:531)
...
During refresh i do the following:
public void refresh() {
try {
ruleBase.removePackage("org.sample.mypackage");
// reading drl files from direcotry and puting them
in the package
...
for(int i = 0; i < size; i++ ) {
builder.addPackageFromDrl( new
InputStreamReader(getClass().getResourceAsStream( "package" + i +
".drl" ) )
);;
}
if(ruleBase == null) {
ruleBase = RuleBaseFactory.newRuleBase();
}
ruleBase.addPackage(builder.getPackage());
} catch(Exception e) {
log.error("Error while refreshing rules: ", e);
}
}
and one of my .drl files (they all belong to the same package) looks
something like this:
package org.sample.mypackage
import org.sample.Orders;
import org.sample.OrderItem;
import org.sample.service.OrderService;
import java.util.ArrayList
import org.apache.log4j.Logger
global OrderService orderService
global Logger log
rule "Apply Discount"
when
orders : Orders();
items : ArrayList() from collect (
OrderItem(value > 100)
from order.items)
then
log.debug("Apply Discount");
orderService.applyDiscount(items);
end
were OrderService is a service class that i'm using to do some calculating.
Do you have some idea about what could be causing this error?
Edson Tirelli-3 wrote:
Can you try 4.0.3? There was some fix for package management included
in
4.0.2 if I'm not mistaken...
[]s
Edson
2007/10/31, igor_b <igorbolic(a)gmail.com>:
>
>
> Hi,
>
> I'm using drools 4.0.1. I'm first adding one package to my RuleBase
> object,
> and everything works just fine:
>
> ...
> builder.addPackageFromDrl(new InputStreamReader(resource.getInputStream
> ()));
>
> if(ruleBase == null) {
> ruleBase = RuleBaseFactory.newRuleBase();
> }
> ruleBase.addPackage(builder.getPackage());
>
>
> But after some time i need to refresh my rules, so i'm using following
> code
> to remove previous package:
>
> ruleBase.removePackage("org.sample.mypackage");
>
> and i'm getting the following error:
>
> java.lang.NullPointerException
> at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java
> :222)
> at
> org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java
> :272)
> at
> org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java
> :460)
> at
> com.diosphere.diomedia.common.drools.impl.RulesServiceImpl.refresh(
> RulesServiceImpl.java:121)
> at
> com.diosphere.diomedia.service.impl.PromotionManagerImpl.refreshDRLs(
> PromotionManagerImpl.java:39)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java
> :39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(
> DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> uk.ltd.getahead.dwr.impl.ExecuteQuery.execute(ExecuteQuery.java
> :170)
> at
> uk.ltd.getahead.dwr.impl.DefaultProcessor.doExec(DefaultProcessor.java
> :552)
> at
> uk.ltd.getahead.dwr.impl.DefaultProcessor.handle(DefaultProcessor.java:88)
> at uk.ltd.getahead.dwr.DWRServlet.doPost(DWRServlet.java:178)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
> ApplicationFilterChain.java:290)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(
> ApplicationFilterChain.java:206)
> at
> com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(
> PageFilter.java:118)
> at
> com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(
> PageFilter.java:52)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
> ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(
> ApplicationFilterChain.java:206)
> at
> net.sf.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java
> :167)
> at
> net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(
> FilterToBeanProxy.java:120)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
> ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(
> ApplicationFilterChain.java:206)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(
> StandardWrapperValve.java:230)
> at
> org.apache.catalina.core.StandardContextValve.invoke(
> StandardContextValve.java:175)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
> :128)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
> :104)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(
> StandardEngineValve.java:109)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java
> :261)
> at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
> Http11Protocol.java:581)
> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(
> JIoEndpoint.java:447)
> at java.lang.Thread.run(Thread.java:619)
>
> Does anyone have a clue what might be the problem, and how to fix it?
> Kind regards!
> --
> View this message in context:
> http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13...
> Sent from the drools - user mailing list archive at Nabble.com.
>
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>
--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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