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Getting error while working with "request" example in jBPM
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created by <a href="https://community.jboss.org/people/prashanth_biomorf">prashanth Reddy Dundigal</a> in <i>jBPM Development</i> - <a href="https://community.jboss.org/message/753458#753458">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When I run the request example, for dynamically adding the ad-hoc rule, it gives me the below error. The code is exactly the same given in example. What we need to change in order to execute it correctly. I see that it is not printing what is there in the "adhoc.drl", so obviously adhoc rule is not invoked.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I get the error at the line "ksession.getKnowledgeBase().addKnowledgePackages(kbuilder.getKnowledgePackages());"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: unable to invoke method: org.jbpm.examples.request.Request.getId: target of method is null</p><p>          at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:66)</p><p>          at org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.getValue(VariableAccessor.java:37)</p><p>          at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)</p><p>          at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:107)</p><p>          at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)</p><p>          at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:123)</p><p>          at org.mvel2.MVEL.executeExpression(MVEL.java:930)</p><p>          at org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:70)</p><p>          at org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:49)</p><p>          at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:167)</p><p>          at org.drools.rule.constraint.MvelConstraint.isAllowedCachedLeft(MvelConstraint.java:136)</p><p>          at org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:130)</p><p>          at org.drools.reteoo.FromNode.updateSink(FromNode.java:473)</p><p>          at org.drools.reteoo.RuleTerminalNode.attach(RuleTerminalNode.java:344)</p><p>          at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:168)</p><p>          at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:128)</p><p>          at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:116)</p><p>          at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:445)</p><p>          at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:956)</p><p>          at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:627)</p><p>          at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)</p><p>          at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)</p><p>          at org.jbpm.examples.request.RequestUI.addRules(RequestUI.java:238)</p><p>          at org.jbpm.examples.request.RequestUI.access$3(RequestUI.java:229)</p><p>          at org.jbpm.examples.request.RequestUI$4.actionPerformed(RequestUI.java:182)</p><p>          at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)</p><p>          at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)</p><p>          at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)</p><p>          at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)</p><p>          at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)</p><p>          at java.awt.Component.processMouseEvent(Component.java:6263)</p><p>          at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)</p><p>          at java.awt.Component.processEvent(Component.java:6028)</p><p>          at java.awt.Container.processEvent(Container.java:2041)</p><p>          at java.awt.Component.dispatchEventImpl(Component.java:4630)</p><p>          at java.awt.Container.dispatchEventImpl(Container.java:2099)</p><p>          at java.awt.Component.dispatchEvent(Component.java:4460)</p><p>          at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)</p><p>          at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)</p><p>          at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)</p><p>          at java.awt.Container.dispatchEventImpl(Container.java:2085)</p><p>          at java.awt.Window.dispatchEventImpl(Window.java:2475)</p><p>          at java.awt.Component.dispatchEvent(Component.java:4460)</p><p>          at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)</p><p>          at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)</p><p>          at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)</p><p>          at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)</p><p>          at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)</p><p>          at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)</p><p>          at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)</p><p>Caused by: java.lang.NullPointerException</p><p>          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</p><p>          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)</p><p>          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)</p><p>          at java.lang.reflect.Method.invoke(Method.java:597)</p><p>          at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:43)</p><p>          ... 49 more</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can you please see it and let us know what to do.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you in advance,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Warmest regards,</p><p>Prashanth Reddy Dundigal</p></div>
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