Where are JPA variablepersisters, in Drools 5.3?
by dunnlow
Using Drools 5.3, I'm trying to set up a statefull knowledgesession that
persists out to a database. With all of the examples on nabble and the
documentation (Example 2.10. JPA configuration for StatefulKnowledgeSessions
http://docs.jboss.org/drools/release/5.3.0.Final/droolsjbpm-introduction-...)
seems like it should be straight forward enough.
However, in all of those examples, variablepersisters are configured that
are in the package org.drools.persistence.processinstance.persisters (like:
<drools:persister for-class="javax.persistence.Entity"
implementation="org.drools.persistence.processinstance.persisters.JPAVariablePersister"
I can't find that package anywhere in Drools 5.3 (or JBPM 5.2). Can someone
PLEASE suggest where to find those classes/packages?
Is the documentation (above) incorrect/outdated? If so, can someone point
me to a working example of JPA transactions configured via Spring.
Thanks very much!
-J
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12 years, 10 months
memory leak in Guvnor 5.3 when rules have incorrect regular expressions ?
by vadlam
we have hundreds of rules created in Guvnor 5.3..Final.
some of them use regular expressions when using the matches operator.
when business users enter an incorrect regular expression and rules are
built in guvnor subsequently, we have noticed heap consumption grow quite a
bit and not released subsequenlty.
currently, on a windows server that has approximately 1.3 GB heap available,
running 1 or builds consumes the whole memory and eventually crashes the
server.
The following is from one such log trace
[Near : {... **HST ....}]
^
[Line: 1, Column: 3]
[Error: Missing left node]
[Near : {... **HST ....}]
^
[Line: 1, Column: 3]
at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:293)
at
org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
at
org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:903)
at
org.drools.rule.builder.PatternBuilder.buildRelationalExpression(PatternBuilder.java:599)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:540)
at
org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:398)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:314)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:131)
at
org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2289)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:807)
at
org.drools.guvnor.server.contenthandler.GuidedDTContentHandler.compile(GuidedDTContentHandler.java:63)
at
org.drools.guvnor.server.builder.PackageAssembler.loadAllButDRLAssets(PackageAssembler.java:83)
at
org.drools.guvnor.server.builder.PackageAssembler.loadAssets(PackageAssembler.java:73)
at
org.drools.guvnor.server.builder.PackageAssembler.buildPackage(PackageAssembler.java:65)
at
org.drools.guvnor.server.builder.PackageAssembler.compile(PackageAssembler.java:55)
at
org.drools.guvnor.server.RepositoryPackageOperations.buildPackage(RepositoryPackageOperations.java:506)
at
org.drools.guvnor.server.RepositoryPackageOperations.buildPackage(RepositoryPackageOperations.java:475)
at
org.drools.guvnor.server.RepositoryPackageService.buildPackage(RepositoryPackageService.java:314)
Any thoughts or suggestions around these memory leak issues?
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12 years, 10 months
Doubt over Agenda-Group
by swaroop
Hi,
Iam invoking a template from a rule using agenda-group setfocus. My doubt is
,after focusing and executing the template based on the agenda-group where
will the rule control fall back to.
Eg:
Rule 1
ruleflow-group "RF1"
WHEN
c : someFact(someCond)
THEN
kcontext.getKnowledgeRuntime().getAgenda().getAgendaGroup("AG1").setFocus();
Do something1
Do Something2 based on some actions set in template invoked through
agenda-group
END
Rule 2
ruleflow-group "RF1"
WHEN
c : someFact(someCond1-->someCond1 is based on the parameters set in
template called in prev rule)
THEN
Do Something3
END
What should be the flow of events after rule 1 execution ?
Thanks
Swaroop
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12 years, 10 months
Contributing to Drools?
by Stephen Masters
Hi folks,
As with Mark's response on OSGI this morning, there have been a number of answers to questions on this list that mention that components are either not currently being worked on, or which request that users contribute new features or patches.
It tends not to be that easy to get to grips with a large open source project, so recently the London Java Community organised an OpenJDK hack session (http://www.meetup.com/Londonjavacommunity/events/49243872/) where they were helping people to build the projects and working on some 'low-hanging-fruit' issues. And apparently the session produced around 20 patches, which seems pretty impressive to me given that it was just a 3-hour evening session.
There seems to be a reasonable number of Drools developers and users in or near London, although I'm not sure about other locations. So I was wondering how feasible it might be to organise something similar around Drools. Obviously it would need a combination of some core developers prepared to spend some of their time helping folks such as myself get to grips with building and testing things, and enough developers interested in spending their spare time learning their way around the internals of the various Drools components. The London JBoss User Group set up a JBoss AS7 hackathon last year, so perhaps there might be someone there who would be prepared to help out?
Any thoughts?
Steve
12 years, 10 months
Doubt over Agenda-Group
by swaroop
Hi,
Iam invoking a template from a rule using agenda-group setfocus. My doubt is
,after focusing and executing the template based on the agenda-group where
will the rule control fall back to.
Eg:
Rule 1
ruleflow-group "RF1"
WHEN
c : someFact(someCond)
THEN
kcontext.getKnowledgeRuntime().getAgenda().getAgendaGroup("AG1").setFocus();
Do something1
Do Something2 based on some actions set in template invoked through
agenda-group
END
Rule 2
ruleflow-group "RF1"
WHEN
c : someFact(someCond1-->someCond1 is based on the parameters set in
template called in prev rule)
THEN
Do Something3
END
What should be the flow of events after rule 1 execution ?
Thanks
Swaroop
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12 years, 10 months
how to retract all documents created in the following scenario
by vadlam
Hi All,
we have a scenario whereby, several documents are created as part of the
ruleflow. at the end of the ruleflow, if any of the fields in the document
is empty or null, we would like to create a error (only one error) and
retract all the documents so far.
rule "createError"
ruleflow-group "mrHardErrors"
no-loop true
dialect "mvel"
when
emptyDoc : Document( field1== null || == ( "" ) , field2 == null || == ( ""
) )
doc : Document( )
then
Error fact0 = new Error();
fact0.setErrorCode( "code1" );
insert(fact0 );
retract( emptyDoc);
end
I see that error is created more than once ( as many as matching documents )
How do we ensure that all documents are retracted and also the error is
created only once ?
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12 years, 10 months
Camel-drools example
by Serge Vilvovsky
Can anybody provide, please, the example of using camel with drools? Where
should I place the drool files if I run them in ServiceMix?
Thank you!
12 years, 10 months
