[jboss-jira] [JBoss JIRA] (JBRULES-3283) Concurrency issue: Invalid bytecode generated by KnowledgeBuilder.add()

[Thomas Kruse (Created) (JIRA)]

Concurrency issue: Invalid bytecode generated by KnowledgeBuilder.add()
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                 Key: JBRULES-3283
                 URL: https://issues.jboss.org/browse/JBRULES-3283
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler (expert)
    Affects Versions: 5.3.0.Final, 5.3.0.CR1
         Environment: Oracle Java 6, Oracle Java 7, Linux, MacOS
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03-384-10M3425)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-384, mixed mode)
            Reporter: Thomas Kruse
            Assignee: Mark Proctor
            Priority: Minor


Since Drools 5.3.0.CR1 concurrent creation of different knowledgebases from filesystem DRL rule definition leads to illegal bytecode.
Reproduceable with Janino and eclipse compiler.

I have a maven based test project which executes the unit tests in parallel, this is the result:
{code}
runFirst(de.trion.drools53.TwoTest): -1
  runFirst(de.trion.drools53.FourTest): (class: de/trion/drools53/Rule_When_a_user_is_young__print_his_name_DefaultConsequenceInvoker, method: equals signature: (Ljava/lang/Object;)Z) Expecting to find integer on stack
  runSecond(de.trion.drools53.FourTest): (class: de/trion/drools53/Rule_When_a_user_is_young__print_his_name_DefaultConsequenceInvoker, method: equals signature: (Ljava/lang/Object;)Z) Expecting to find integer on stack
  runFirst(de.trion.drools53.OneTest): (class: de/trion/drools53/Rule_When_a_user_is_young__print_his_name_DefaultConsequenceInvoker, method: equals signature: (Ljava/lang/Object;)Z) Expecting to find integer on stack
  runFirst(de.trion.drools53.ThreeTest): (class: de/trion/drools53/Rule_When_a_user_is_young__print_his_name_DefaultConsequenceInvoker, method: equals signature: (Ljava/lang/Object;)Z) Incompatible object argument for function call
  runSecond(de.trion.drools53.ThreeTest): (class: de/trion/drools53/Rule_When_there_is_god__the_light_always_shines_DefaultConsequenceInvoker, method: equals signature: (Ljava/lang/Object;)Z) Unable to pop operand off an empty stack
{code}

Workaround: synchronize access
Not affected: Drools 5.3.0.Beta

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