Re: [drools-user] Strange Exception

[Edson Tirelli]

  Charles,

  Are you setting your global list in the working memory?

workingMemory.setGlobal( "list", new ArrayList() ) ;

  []s
  Edson

Charles Lee wrote:

Hi,

I have written a simple rule:

#list any import classes here.
import test.Person

rule "check pete"
    when
        fet : Person( name == "pete");
    then
        System.out.println("fet name " + fet.getName());
end


When I run this it passes;

But If I run the same rule but in the RHS I add the person to the list, like so:

#list any import classes here.
import test.Person


#declare any global variables here
global java.util.List list


rule "check pete"
    when
        fet : Person( name == "pete");
    then

list.add( fet ); end

I am getting the following error

org.drools.spi.ConsequenceException: java.lang.NullPointerException
    at org.drools.common.Agenda.fireActivation(Agenda.java:316)
    at org.drools.common.Agenda.fireNextItem(Agenda.java:290)

at org.drools.reteoo.WorkingMemoryImpl.fireAllRules(WorkingMemoryImpl.java:253) at org.drools.reteoo.WorkingMemoryImpl.fireAllRules(WorkingMemoryImpl.java:266)

    at client.test.RuleBootStrap.runRules(RuleBootStrap.java:51)
    at client.test.RuleTest.testGetEmbo(RuleTest.java:10)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

    at java.lang.reflect.Method.invoke(Method.java:585)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at junit.framework.TestSuite.runTest(TestSuite.java:208)
    at junit.framework.TestSuite.run(TestSuite.java:203)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:481) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:347) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: java.lang.NullPointerException

at uk.ac.ebi.submission.rules.Rule_add_new_gene_symbol_0.consequence(Rule_add_new_gene_symbol_0.java:6) at uk.ac.ebi.submission.rules.Rule_add_new_gene_symbol_0ConsequenceInvoker.evaluate(Rule_add_new_gene_symbol_0ConsequenceInvoker.java:21)

    at org.drools.common.Agenda.fireActivation(Agenda.java:313)
    ... 20 more

Any ideas?

Thanks in advance