[rules-users] Help with MR3

[s erel]

In our project we are creating a StatefulRuleSession and saving it in a
per-thread context (i.e. Each thread has it's own StatefulRuleSession):

ruleServiceProvider.getRuleRuntime().createRuleSession(contextName,
properties, RuleRuntime.STATEFUL_SESSION_TYPE);

When a thread session ends, we are calling release on the previously created
StatefulRuleSession.


Changing the following lines:


public abstract class AbstractHashTable


...

    public Iterator iterator() {
//        if ( this.iterator == null ) {
//            this.iterator = new HashTableIterator( this );
//        }
//
//        this.iterator.reset();
//        return this.iterator;

        HashTableIterator iterator = new HashTableIterator(this);
        iterator.reset();

        return iterator;
    }
Seems to solve the problem I've encountered. What's your opinion?


On 7/2/07, Mark Proctor <mproctor at codehaus.org> wrote:
>
> a working memory should be single threaded, so not sure how this could be
> a race condition?
>
> Mark
> s erel wrote:
>
> I've done a little debugging. The code fails in the following segment:
>
> public static class HashTableIterator
> ...
>  while ( this.entry == null ) {
>                     this.row++;
>                     if ( this.row == this.length ) {
>                         return null;
>                     }
>                     this.entry = this.table[this.row]; *// ---> index out
> of bounds exception*
>                 }
> }
>
> this.row has the same value as this.length despite the condition above it.
> Probably a race condition issue.
>
>
> On 7/2/07, Mark Proctor <mproctor at codehaus.org > wrote:
> >
> > Not really :(
> >
> > In your situation I tend to keep removing rules and data while still
> > making sure the error happens, to get it down to a minimum. Please do try,
> > as this isn't an error that should happen. Or alterntaively you can open
> > drools-core and drools-compiler in eclipse and execuse and debug this
> > yourself - in your situation this might best. you can put in a breakpoint to
> > listen for that particular exception.
> >
> > Mark
> > s erel wrote:
> >
> > It's hard for me to provide a self contained project. The drl is long
> > and uses several business objects. It's the same drl as we've been using for
> > 306 minus the keyword changes.
> > Is there anything else i can check or provide you in order to solve this
> > matter.
> >
> > Thanks
> >
> > On 7/1/07, Mark Proctor <mproctor at codehaus.org > wrote:
> > >
> > > Can you provide us a self contained project which creates this error?
> > > Unless we can recreate it, it will be very hard to track it down. Please
> > > attach the project to a jira and we'll make it a priority.
> > >
> > > Mark
> > > s erel wrote:
> > >
> > >  Hello,
> > >
> > > I've just started integrating MR3 into my project (I've previously
> > > used 3.06). The drl compiles and everything seems fine, but during
> > > tests the following exception is thrown for time to time:
> > >
> > > java.lang.ArrayIndexOutOfBoundsException: 17
> > >  at org.drools.util.AbstractHashTable$HashTableIterator.next(
> > > AbstractHashTable.java:250)
> > >  at org.drools.reteoo.Rete$ObjectTypeConf.buildCache(Rete.java:434)
> > >  at org.drools.reteoo.Rete$ObjectTypeConf.getObjectTypeNodes(Rete.java
> > > :425)
> > >  at org.drools.reteoo.Rete.assertObject(Rete.java:172)
> > >  at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java
> > > :190)
> > >  at
> > > org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.execute(
> > > ReteooWorkingMemory.java:163)
> > >  at org.drools.common.AbstractWorkingMemory.executeQueuedActions(
> > > AbstractWorkingMemory.java:1135)
> > >  at org.drools.common.AbstractWorkingMemory.insert(
> > > AbstractWorkingMemory.java:781)
> > >  at org.drools.common.AbstractWorkingMemory.insert(
> > > AbstractWorkingMemory.java:584)
> > >  at org.drools.jsr94.rules.StatefulRuleSessionImpl.addObject(
> > > StatefulRuleSessionImpl.java:162)
> > >
> > > This only happens during high load tests.
> > > Can anyone help me?
> > >
> > > Thanks
> > >
> > >
> > > ------------------------------
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