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  1. JBRULES
  2. JBRULES-2481

Unable to reference globals in object constructors on RHS of rule

    Details

    • Steps to Reproduce:
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      See attached project. Use mvn test to see the failure.

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      See attached project. Use mvn test to see the failure.

      Description

      After migrating to Drools 5 from 4.0.7, it seems that you can't reference globals in object constructors on the RHS of a rule. Here is my DRL:

      package test.rules

      #list any import classes here.
      import test.domain.Field;

      #declare any global variables here
      global test.service.CalendarManager calendarManager;

      dialect "mvel"

      rule "FieldRuleTest.todayField"
      when
      then
      new Field("todayField",calendarManager.getToday())
      end

      After reading this DRL with PackageBuilder, creating a StatefulSession from the resulting rulebase, setting the global, and then executing fireAllRules, I get the following exception:

      org.drools.runtime.rule.ConsequenceException: [Error: unable to access property (null parent): calendarManager]
      [Near :

      {... Unknown ....}]
      ^
      [Line: 1, Column: 0]
      at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
      at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:980)
      at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:917)
      at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1126)
      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:697)
      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:663)
      at test.MvelBindingProblemTest.mvelBindingTestFailure(MvelBindingProblemTest.java:40)
      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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
      Caused by: [Error: unable to access property (null parent): calendarManager]
      [Near : {... Unknown ....}

      ]
      ^
      [Line: 1, Column: 0]
      at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:860)
      at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:584)
      at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:312)
      at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)
      at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)
      at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:41)
      at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileConstructor(ReflectiveAccessorOptimizer.java:1090)
      at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:1047)
      at org.mvel2.ast.NewObjectNode.getReducedValueAccelerated(NewObjectNode.java:158)
      at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
      at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:104)
      at org.mvel2.MVEL.executeExpression(MVEL.java:995)
      at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:87)
      at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:971)
      ... 27 more

      Attached is a project with a failing test case for this issue.

      If I simply add a silly reference to the global to the DRL as follows, everything works:
      rule "FieldRuleTest.todayField"
      when
      then
      stupidLocalVariable = calendarManager
      new Field("todayField",calendarManager.getToday())
      end

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              • Assignee:
                mark.proctor Mark Proctor
                Reporter:
                cdelashmutt Chris DeLashmutt
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                • Created:
                  Updated:
                  Resolved: