[rules-users] Issue in Drools 5.5 concerned with rule and scanning list with from command

braveheart85 andrea.pacifico.85 at gmail.com
Fri Oct 11 05:55:41 EDT 2013 

Hello,

I'm having a strange issue. I have a medium size rule file with rules like
these:

when
	InvestigationTarget( $code : identifierCode )
	$s: SubjectData( identifierCode == $code )
	$r: Registry( )
	$y: YearData( ) from $r.years
	$p: Purchase( customerIdentifierCode == $s.identifierCode ) from
$y.purchases
then
	...

My application is actually still a prototype and i work building a session
with facts already inserted and when the system started the user changes DRL
to use with facts.
My issue is when i add resource to knowledge builder. I catch an exception
when exists one fact can activate the above rule:

java.lang.RuntimeException: unable to invoke method:
org.titan.registry.BusinessEntityData.getIdentifierCode: target of method is
null
	at
com.liferay.portal.kernel.portlet.LiferayPortlet.callActionMethod(LiferayPortlet.java:171)
	at
com.liferay.util.bridges.mvc.MVCPortlet.callActionMethod(MVCPortlet.java:250)
	at
com.liferay.portal.kernel.portlet.LiferayPortlet.processAction(LiferayPortlet.java:80)
	at
com.liferay.util.bridges.mvc.MVCPortlet.processAction(MVCPortlet.java:220)
	at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:70)
	at
com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:48)
	at
com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:111)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
	at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593)
	at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530)
	at
com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:534)
	at
com.liferay.portlet.InvokerPortletImpl.invokeAction(InvokerPortletImpl.java:579)
	at
com.liferay.portlet.InvokerPortletImpl.processAction(InvokerPortletImpl.java:294)
	at
com.liferay.portal.action.LayoutAction.processPortletRequest(LayoutAction.java:944)
	at
com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:688)
	at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:249)
	at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	at
com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:176)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	at
com.liferay.portal.servlet.MainServlet.callParentService(MainServlet.java:560)
	at com.liferay.portal.servlet.MainServlet.service(MainServlet.java:537)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
	at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
	at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
	at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
	at
com.liferay.portal.servlet.FriendlyURLServlet.service(FriendlyURLServlet.java:138)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.strip.StripFilter.processFilter(StripFilter.java:335)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.gzip.GZipFilter.processFilter(GZipFilter.java:123)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.i18n.I18nFilter.processFilter(I18nFilter.java:241)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.autologin.AutoLoginFilter.processFilter(AutoLoginFilter.java:246)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.sso.ntlm.NtlmPostFilter.processFilter(NtlmPostFilter.java:83)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.sharepoint.SharepointFilter.processFilter(SharepointFilter.java:80)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
	at
com.liferay.portal.servlet.filters.virtualhost.VirtualHostFilter.processFilter(VirtualHostFilter.java:216)
	at
com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:187)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:187)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
	at
com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
	at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
	at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
	at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: unable to invoke method:
org.titan.registry.BusinessEntityData.getIdentifierCode: target of method is
null
	at
org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:66)
	at
org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.getValue(VariableAccessor.java:37)
	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)
	at
org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:107)
	at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
	at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:123)
	at org.mvel2.MVEL.executeExpression(MVEL.java:930)
	at
org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:70)
	at
org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:49)
	at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:167)
	at
org.drools.rule.constraint.MvelConstraint.isAllowedCachedLeft(MvelConstraint.java:136)
	at
org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:130)
	at org.drools.reteoo.FromNode.updateSink(FromNode.java:473)
	at org.drools.reteoo.RuleTerminalNode.attach(RuleTerminalNode.java:344)
	at
org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:168)
	at
org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:128)
	at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:116)
	at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:445)
	at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:956)
	at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:627)
	at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
	at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
	at
org.myproject.frontend.investigation.drools.DroolsInvestigationEngine.setResources(DroolsInvestigationEngine.java:137)
	at
org.myproject.frontend.investigation.drools.filter.InvestigationFilter.setupEnvironment(InvestigationFilter.java:118)
	at
org.myproject.frontend.investigation.drools.DroolsFilter.execute(DroolsFilter.java:19)
	at
org.myproject.frontend.investigation.drools.DroolsInvestigationSession.executeFilter(DroolsInvestigationSession.java:64)
	at org.myproject.portlet.SearchResult.openGraph(SearchResult.java:86)
	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
com.liferay.portal.kernel.portlet.LiferayPortlet.callActionMethod(LiferayPortlet.java:153)
	... 136 more
Caused by: java.lang.NullPointerException
	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
org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:43)
	... 167 more

I tried a workaround modifying rule in this way:

	$p: Purchase( customerIdentifierCode == $code ) from $y.purchases

thus i don't catch the exception anymore, but simply the rule don't activate
though it should.

If anyone could help me...

Best regards



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