1:20 p.m.
I'm not very experienced with Drools but have some Java code that dynamically
loads/unloads rules from a KnowledgeBase. It worked with 5.2 but now throws the following
exception with 5.3
org.drools.RuntimeDroolsException: Unable to merge resource attribute for type declaration
of class: 'NormalizedEvent'
at org.drools.common.AbstractRuleBase.mergeLeft(AbstractRuleBase.java:642)
at
org.drools.common.AbstractRuleBase.mergeTypeDeclarations(AbstractRuleBase.java:608)
at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:537)
at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:458)
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
at
com.hp.mon.processor.KnowledgeSessionFactory.addRules(KnowledgeSessionFactory.java:181)
at com.hp.mon.processor.RuleRunner.runRules(RuleRunner.java:54)
at com.hp.mon.processor.RulesTest.test(RulesTest.java:57)
at com.hp.mon.processor.RulesTest.testSiteScopeSNMPRules(RulesTest.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
I have three .drl files. The first is "globals.drl" that simply imports and
defines some global variables (e.g, a org.slf4j.Logger, etc.). This globals.drl file
also defines NormalizedEvent as follows:
declare NormalizedEvent
@role( event )
end
The second rules file (defaultRules.drl) contains default rules for aging out old / stale
events.
The third rules file has rules additional rules that are specific to a policy being
dynamically deployed to our application.
The compilation and loading process treats "globals.drl" as common
"header" file. That is, rules files are pre-pended with globals.drl before they
are compiled. For example:
String globals = readDrlfile("globals.drl");
String newRules = readDrlfile("rulesToAdd.drl");
knowledgeBuilder.add(ResourceFactory.newReaderResource(new StringReader(globals +
newRules)));
if (knowledgeBuilder.hasErrors()) {
throw exception ...
}
// No exception so compile succeeded --- BTW, it's using JANINO
knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages()); //
ERROR
The first compile and load (globals.drl + defaultRules.drl) succeeds but I get this
exception when I try to compile and load an additional file (globals.drl +
additionalRules.drl).
This code was also written by someone not very familar with Drools but it was working in
5.2 and now I need to get it working with 5.3 Looks like there were some significant
code changes to AbstractRuleBase between these two releases.
Any thoughts or suggestion here would be greatly appreciated.