Re: [rules-users] java.lang.ClassCastException: org.drools.reteoo.BetaMemory cannot be cast to org.drools.reteoo.AlphaNode$AlphaMemory

Sorry, but I doubt that anyone can benefit from this somewhat obscure description of a use case - but thanks for trying. -W On 06/05/2013, dcrissman <dcrissman(a)redhat.com&gt; wrote: > While working on a sanitized version of the code, I discovered my issue. > > I am using a StatefulKnowledgeSession essentially statelessly. I am doing > this because in the past I have found StatefulKnowledgeSession to be more > feature rich. Regardless, each execution created a new > StatelessKnowledgeSession instance which is built from a single instance of > a KnowledgeBase. During the setup for each run, I was adding my change_set > to that KnowledgeBase, causing the error I was getting. I'd like to think > that my mistake could be recycled and benefit someone else in the future. > > Davide - Thank you for your time. Sorry that this turned out to be user > error. > > -Dennis > > > Davide Sottara wrote >> Could you post **at least** the unit test throwing the exception, >> the one that "enables" it and the code you are using to run them? >> This may be yet another blocker for 5.6, so I'd like to investigate it >> as soon as possible >> Thanks! >> Davide >> >> On 05/02/2013 07:20 AM, dcrissman wrote: >>> Yes, I am getting this exception (sadly, not something that I am just >>> worried >>> about). >>> >>> I am checking for rule complication errors before running the rules, and >>> no >>> errors are being given. >>> >>> I am not dynamically adding or removing rules once I have my knowledge >>> base >>> setup, it does not change though the duration of the run. >>> >>> I am using a StatefulKnowledgeSession, and I make sure that after each >>> run >>> that I am calling dispose in a finally block. So shouldn't be any >>> strange >>> memory issues. >>> >>> To add to the original description, I am getting these exceptions in my >>> unit >>> tests. There is one unit test suite that when disabled the exception >>> goes >>> away, but when enabled the exceptions happen in other suites. Which of >>> course is odd and led me to believe that there is a problem with the >>> unit >>> tests (which is still not ruled out). But the suites are using different >>> sessions, same rules, but totally different instances of everything. >>> >>> The only thing I am doing that may be a little funny is consolidating a >>> collection of objects into one then retracting the collection, but when >>> I >>> comment out this rule I still am getting this exception. Aside from this >>> one >>> case, I am not doing anything crazy. >>> >>> [code] >>> //ArrayList provided by drools seems to dynamically adjust with the >>> retractions, this safeguards us against that. >>> ArrayList safetyArr = new ArrayList($attrs); >>> >>> ArrayList values = new ArrayList(); >>> for (int i=0; i < safetyArr.size(); i++){ >>> Attribute attr = ((Attribute) safetyArr.get(i)); >>> values.add(attr.getValue()); >>> retract(attr); >>> } >>> >>> insert(newAttribute($redHatName, StringUtils.join(values, ","))); >>> [/code] >>> >>> Any other thoughts you may have would be appreciated. >>> >>> Thanks! >>> >>> >>> Davide Sottara wrote >>>> The original thread was for a bug in 5.0.x, fixed in 5.1, but it would >>>> be >>>> a >>>> very serious issue in 5.5. It basically means that the local memory of >>>> a >>>> beta node has been assigned to an alpha node, or that the wrong memory >>>> had >>>> been retrieved. In any case, the rete is broken: wrong facts or types >>>> would >>>> be joined in a different order or way than stated by the rules. >>>> >>>> Is this something you're experiencing , or just worried that it may >>>> happen? >>>> >>>> Causes could be an invalid rule in the first place (running the engine >>>> without checking for compilation errors), a bug in the construction >>>> process >>>> (unlikely, unless the rule is a very rare edge case), or a complex >>>> scenario >>>> where you add and remove rules dynamically from a knowledge base. >>>> On May 1, 2013 2:25 PM, "dcrissman" &lt; >>>> dcrissman@ >>>> &gt; wrote: >>>> >>>>> Could you explain what you mean by rete corruption? I am familiar with >>>>> rete, >>>>> but hardly an expert. I am not really doing anything too complicated, >>>>> I >>>>> guess some runtime inserts and retracts. >>>>> >>>>> I tried 6.0.0.Beta2, but that has more api changes then I am prepared >>>>> to >>>>> handle, I'll wait until the Final version. >>>>> >>>>> As for 5.6.0-SNAPSHOT, I am having trouble pulling it down. I will >>>>> pick >>>>> that >>>>> up tomorrow. >>>>> >>>>> In the meantime, any clarification to the rete question would be >>>>> appreciated. >>>>> >>>>> Thanks, >>>>> Dennis >>>>> >>>>> >>>>> >>>>> -- >>>>> View this message in context: >>>>> http://drools.46999.n3.nabble.com/java-lang-ClassCastException-org-drools... >>>>> Sent from the Drools: User forum mailing list archive at Nabble.com. >>>>> _______________________________________________ >>>>> rules-users mailing list >>>>> >>>> rules-users@.jboss >>>>> https://lists.jboss.org/mailman/listinfo/rules-users >>>>> >>>> _______________________________________________ >>>> rules-users mailing list >>>> rules-users@.jboss >>>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >>> >>> >>> -- >>> View this message in context: >>> http://drools.46999.n3.nabble.com/java-lang-ClassCastException-org-drools... >>> Sent from the Drools: User forum mailing list archive at Nabble.com. >>> _______________________________________________ >>> rules-users mailing list >>> >> rules-users@.jboss >>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >> _______________________________________________ >> rules-users mailing list >> rules-users@.jboss >> https://lists.jboss.org/mailman/listinfo/rules-users > > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/java-lang-ClassCastException-org-drools... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users