NullPointerException while loading pkg by KnowledgeAgent
by FlyingEagle
Hello,
I have this exception in my Drools application and I don't know what's
happening.
I try to load a pkg by applying a defined change set by the KnowledgeAgent.
If I load the pkg by the KnowledgeBuilder, everything is fine, but I want to
use the KnowledgeAgent, so that changes are automatically recognized.
Can anybody help me?
Thx
http://drools.46999.n3.nabble.com/file/n3959482/CardTrapping.drl
CardTrapping.drl
http://drools.46999.n3.nabble.com/file/n3959482/EngineStarter.java
EngineStarter.java
java.lang.NullPointerException at
org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.getInterval(AfterEvaluatorDefinition.java:272)
at
org.drools.rule.VariableRestriction.getInterval(VariableRestriction.java:132)
at
org.drools.rule.VariableConstraint.getInterval(VariableConstraint.java:133)
at
org.drools.reteoo.builder.BuildUtils.gatherTemporalRelationships(BuildUtils.java:334)
at
org.drools.reteoo.builder.BuildUtils.calculateTemporalDistance(BuildUtils.java:298)
at
org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:108)
at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:110)
at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:441)
at
org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:821)
at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:555)
at
org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:458)
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
at
org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016)
at
org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785)
at
org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169)
at
com.wn.fraud.droolstest.starter.EngineStarter.initializeKnowledgeBase(EngineStarter.java:67)
at
com.wn.fraud.droolstest.starter.EngineStarter.<init>(EngineStarter.java:46)
at
com.wn.fraud.droolstest.starter.EngineStarter.getInstance(EngineStarter.java:33)
at
com.wn.fraud.droolstest.BaseFraudTest_UsingEngineStarter.createKnowledgeBase(BaseFraudTest_UsingEngineStarter.java:8)
at
com.wn.fraud.droolstest.BaseFraudTest.initialize(BaseFraudTest.java:47)
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.RunBefores.evaluate(RunBefores.java:27)
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:49)
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)
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13 years, 9 months
strict-mode and nested object property access in drools 5.4.0.Final - can i cast?
by radai rosenblatt
hello.
I have the following 2 classes:
public class ClassWithPayload {
private String key;
private Object payload;
// getters setters etc ommitted
}
public class PayloadClass {
public String someProp;
//getters setters etc ommitted
}
and im trying to get the following rule to compile:
rule "Naive Payload Access"
when
$container : ClassWithPayload(key == "someKey", (payload != null &&
payload.someProp == "someValue"))
then
System.err.println("boom");
end
which results in the following error:
java.lang.AssertionError: Unable to Analyse Expression payload.someProp:
[Error: unable to resolve method using strict-mode:
java.lang.Object.someProp()]
[Near : {... payload.someProp ....}]
is there some way for me to cast payload.someProp to the proper class ?
(PayloadClass in this case).
this is a simplification of a bigger migration issue from drools 5.1 to 5.4
so the payload property has to remain an Object in the general case.
there's a casting syntax mentioned here
(https://community.jboss.org/wiki/DroolsPatternLanguage) but i take it its
not been implemented yet? (or maybe i just cant understand it properly?)
i've tried this:
rule "Naive Payload Access"
when
$container : ClassWithPayload(key == "someKey", (payload != null &&
payload.#PayloadClass(someProp == "someValue")))
then
System.err.println("boom");
end
but it doesnt compile:
java.lang.AssertionError: [8,51]: [ERR 101] Line 8:51 no viable alternative
at input '(' in rule "Naive Payload Access"
[0,0]: Parser returned a null Package
and if i cant cast, how can i get this sort of rule to behave as it did in
5.1.1 ?
thanks in advance for any assistance,
Radai.
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13 years, 9 months
