[jboss-user] [jBPM] - Re: Transition rule EL Expression fails [Solved]

[milnauf]

milnauf [http://community.jboss.org/people/milnauf] created the discussion

"Re: Transition rule EL Expression fails [Solved]"

To view the discussion, visit: http://community.jboss.org/message/583448#583448

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Hello,
I running into problems when I try evaluating an expression during runtime (yeah - using internal APIs  :s ). What I'm doing is essentially try to find possible execution path using transition's condition.
The problem is that the method org.jbpm.pvm.internal.model.ExpressionCondition.evaluate(OpenExecution execution) - invokes evaluate() on created expression - rather than evaluate(execution). The problem is that the execution variables are not found - because in the subsequent call to JbpmElFactoryImpl.createCompositeResolver - if the scopeInstance is null - which it is in this case - the JbpmVariableElResolver is not added.
So a cosmetic change of the org.jbpm.pvm.internal.model.ExpressionCondition evaluate to invoke evaluate with execution parameter rather than without it - should fix the problem. Unless of course there's a good reason for not passing current execution.

At the bottom I attach a stacktrace for the error that I'm getting -> resulting directly from not using the OpenExecution to evaluate the expression.

The resulting code would be similar to the below:

public class org.jbpm.pvm.internal.model.ExpressionCondition {
public boolean evaluate(OpenExecution execution) {
    Object result = Expression.create(expression, language).evaluate(execution);
    if (result instanceof Boolean) {
      return ((Boolean) result).booleanValue();
    }
    throw new JbpmException("expression condition '" + expression + "' did not return a boolean: "+result);
  }

  ... 
}

Stack trace:
javax.el.PropertyNotFoundException: Cannot resolve identifier 'task1'
    at de.odysseus.el.tree.impl.ast.AstIdentifier.eval(AstIdentifier.java:86)
    at de.odysseus.el.tree.impl.ast.AstEval.eval(AstEval.java:51)
    at de.odysseus.el.tree.impl.ast.AstNode.getValue(AstNode.java:28)
    at de.odysseus.el.TreeValueExpression.getValue(TreeValueExpression.java:122)
    at org.jbpm.pvm.internal.el.UelValueExpression.evaluateInScope(UelValueExpression.java:52)
    at org.jbpm.pvm.internal.el.Expression.evaluate(Expression.java:108)
    at org.jbpm.pvm.internal.model.ExpressionCondition.evaluate(ExpressionCondition.java:41)
    at com.wfi.base.service.util.WorkItemQuery.findFutureItemNames(WorkItemQuery.java:59)
    at com.wfi.base.service.util.WorkItemQuery.findFutureItemNames(WorkItemQuery.java:63)
    at com.wfi.base.service.util.WorkItemQuery.execute(WorkItemQuery.java:50)
    at com.wfi.base.service.util.WorkItemQuery.execute(WorkItemQuery.java:1)
    at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)
    at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:50)
    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)
    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40)
    at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:56)
    at org.jbpm.pvm.internal.svc.SkipInterceptor.execute(SkipInterceptor.java:43)
    at org.jbpm.pvm.internal.processengine.ProcessEngineImpl.execute(ProcessEngineImpl.java:300)
    at com.wfi.ec.workflow.WorkflowService.findCurrentWorkItem(WorkflowService.java:303)
    at com.wfi.ec.workflow.WorkflowServiceTest.testFutureSteps(WorkflowServiceTest.java:392)
    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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    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:49)
    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)
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