[jboss-jira] [JBoss JIRA] Created: (JBRULES-2253) ClassNotFound when ASM optimizer kicks in in MVEL consequence

[Michael Neale (JIRA)]

ClassNotFound when ASM optimizer kicks in in MVEL consequence
-------------------------------------------------------------

                 Key: JBRULES-2253
                 URL: https://jira.jboss.org/jira/browse/JBRULES-2253
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core
    Affects Versions: 5.0.1.FINAL
            Reporter: Michael Neale
            Assignee: Michael Neale
            Priority: Critical
             Fix For: 5.1.0.M1


(ok if the subject is really confusing, perhaps this bug isn't for you). 

In chasing down JBRULES-2234 I found this. Instructions (apologies for relying on Guvnor to reproduce): 

To reproduce is not
easy, but here are some instructions:

* Run latest Guvnor (if you are able to, if not, then the rest is moot !).
* Import the attached repo (unzip it first).
* browse to KnowledgeBases/org/acme/insurance/pricing/
- press "build package"
* shut it down, restart (flushes caches etc...)
Then:
* browse to KnowledgeBases/org/acme/insurance/pricing/Test Scenarios
* open PolicyQuotePackageTest
* run it:

Now you should see an exception like this:
Caused by: java.lang.NoClassDefFoundError: org/acme/insurance/Policy
       at ASMAccessorImpl_62408281250565694450.setValue(Unknown Source)
       at org.mvel2.optimizers.dynamic.DynamicSetAccessor.setValue(DynamicSetAccessor.java:74)
       at org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:47)
       at org.mvel2.MVEL.executeSetExpression(MVEL.java:962)
       at org.mvel2.ast.WithNode$ParmValuePair.eval(WithNode.java:242)
       at org.mvel2.ast.WithNode.getReducedValueAccelerated(WithNode.java:67)
       at org.mvel2.ast.InterceptorWrapper.getReducedValueAccelerated(InterceptorWrapper.java:38)
       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:91)
       at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:966)

This is due to it loading a previously serialized version of the KB.
If it was to run off a freshly compiled one, its all fine. Also, if I
tell MVEL to NOT use ASM optimizer, it works fine (using reflection).
So clearly the stuff is available to the classpath in the right
places... its only to do with ASM in mvel post deserialization. (and
for that to happen, MVEL has to execute the compiled expression enough
to kick in the JIT).

MVELCompilationUnit in drools is worth examining too... still not sure where the problem lies. 

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