5:16 a.m.
I just installed Drools and wanted to build a simple RuleFlow.
But When I add any process containing constraints or rules to my
Knowledgebuilder, I'm always getting a NullPointerException, because the
"package registry" seems to be null.
.....
java.lang.NullPointerException
at org.drools.compiler.ProcessBuilder.buildProcess(ProcessBuilder.java:119)
at
org.drools.compiler.ProcessBuilder.addProcessFromFile(ProcessBuilder.java:223)
at
org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:447)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:503)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
.....
ProcessBuilder.java:118 PackageRegistry pkgRegistry =
this.packageBuilder.getPackageRegistry(process.getPackageName());
ProcessBuilder.java:119 org.drools.rule.Package p =
pkgRegistry.getPackage();
.....
The ruleflow is successfully validated though when i press that button in
eclipse... Can somebody give me a hint what's missing?
Thanks!
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3:14 p.m.
Hi Retoy,
Ever figure this one out? We are having the same issue with one of our
flows.
Thanks,
Paul
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4 p.m.
Hi!
Check if drools-flow-compiler-5.2.0.SNAPSHOT.jar or
jbpm-flow-builder-5.0-SNAPSHOT.jar is in your classpath. (or the jar with
the same function of a older release)
juergen
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8:24 a.m.
Thanks Juergen. But from the above explanation and trace, it seems to me
that you wouldn't get that far if those jars were not in your classpath.
Additionally, this is in knowledgebases that have about 30 other processes
running just fine. When we drop this new one in, the KnowledgeAgent commits
suicide.
We've checked process name, process id, and package name. XML validates
well.
It appears to me that somehow the package/process is not stored in the
registry correctly, at some point.
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1:10 p.m.
Found the problem.
There was a constraint in a split node that was set as type="rule" and
dialect="java". We had java code in the expression like this:
return boolean;
So, my guess is that the rule compiler choked on it since it was not rule
logic, didn't catch the error, and the flow was not placed in the registry
as a result. Later code tried to pull it out, and it was not there.
I would guess there's two psedo bugs here (even though it was our fault for
configuring the process wrong):
1. The compiler code didn't catch the compile error
2. PackageBuilder assumes that a package is in the registry, and crashes the
thread if it is not.
Hope this helps someone else.
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3:52 p.m.
Just tested:
java.lang.NullPointerException
at
org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:430)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:466)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
at drools.test.PersistenceTest.testPersistence(PersistenceTest.java:49)
happends when jbpm-flow-builder-5.0-SNAPSHOT.jar is missing from classpath.
Ok, its 2 stackframes higher ;-)
juergen
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retoy