[rules-users] Slf4j Log4j logger not working with Drools drl while using as a global variable.

[Geoffrey De Smet]

Check if the logger isn't null (by adding a System.out in the then part 
of the rule).

If that's the case, then that error message is pretty poor (or even 
incorrect):
    java.lang.RuntimeException: cannot invoke method: info
It should clearly talk about a NullPointer instead.
So, if that's the case, create a jira issue.
   https://issues.jboss.org/browse/DROOLS


On 27-05-14 07:09, Soumya.plavaga wrote:
> I am using global slf4j log4j logger as a global variable within our drl and
> inserting that global logger value at runtime into kiesession. While we are
> trying to do logger.info with multiple arguments then it's giving the
> following exception stack trace -
>
> Exception executing consequence for rule "Test Logger 2" in
> test.rules.system: java.lang.RuntimeException: cannot invoke method: info
> 	at
> org.drools.core.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
> 	at
> org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1027)
> 	at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:129)
> 	at
> org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:71)
> 	at
> org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935)
> 	at
> org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1200)
> 	at
> org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:952)
> 	at
> org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:926)
> 	at
> org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:232)
> 	at
> test.platform.rules.executor.service.impl.RuleExecutorServiceImplTest.testExecuteRule(RuleExecutorServiceImplTest.java:230)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> 	at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> 	at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> 	at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> 	at
> org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
> 	at
> org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
> 	at
> org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
> 	at
> org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:232)
> 	at
> org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
> 	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
> 	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
> 	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
> 	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
> 	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
> 	at
> org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
> 	at
> org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
> 	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
> 	at
> org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:175)
> 	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)
> Caused by: java.lang.RuntimeException: cannot invoke method: info
> 	at
> org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:63)
> 	at
> org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.getValue(VariableAccessor.java:37)
> 	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)
> 	at org.mvel2.MVELRuntime.execute(MVELRuntime.java:86)
> 	at
> org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123)
> 	at
> org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119)
> 	at org.mvel2.MVEL.executeExpression(MVEL.java:930)
> 	at
> org.drools.core.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:107)
> 	at
> org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1016)
> 	... 36 more
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
> 	at
> org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.executeAll(MethodAccessor.java:140)
> 	at
> org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:48)
> 	... 44 more
>
>
> Example: My drl file looks like this -
>
> package test.system.rule;
>
> import test.platform.model.*;
> import org.slf4j.Logger;
>
> global Logger logger;
>
> rule "Test Logger 1"
>
> when
>
> then
>
> logger.info("within test logger 1");
>
> end
>
> rule "Test Logger 2"
>
> when
>
> then
>
> logger.info("within test logger 2. Rule fired {}",
> drools.getRule().getName());
>
> end
>
>
> While rules are firing then the first logger is getting printed into console
> but second one is not getting printed and giving the above exception to me.
>
>
>
> --
> View this message in context: http://drools.46999.n3.nabble.com/Slf4j-Log4j-logger-not-working-with-Drools-drl-while-using-as-a-global-variable-tp4029707.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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