4:46 a.m.
Unable to reference globals in object constructors on RHS of rule
-----------------------------------------------------------------
Key: JBRULES-2481
URL: https://jira.jboss.org/jira/browse/JBRULES-2481
Project: Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: drools-core (expert)
Affects Versions: 5.1.0.M1, 5.0.1.FINAL
Environment: Windows 7, Sun JDK 1.6.0_17
Reporter: Chris DeLashmutt
Assignee: Mark Proctor
After migrating to Drools 5, 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
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
https://jira.jboss.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira