[rules-users] Help with DefaultAgenda.java

[Mallory]

Hello,

I have tried to change the source code of DefaultAgenda.Java by adding the
code below:

     //drools orginial sequential code
      /*
        while ( continueFiring( fireLimit ) && fireNextItem( agendaFilter )
) {
            fireCount++;
            fireLimit = updateFireLimit( fireLimit );
            this.workingMemory.executeQueuedActions();
        }
        */


        //code with concurrency

        InternalAgendaGroup myGroup = (InternalAgendaGroup) getNextFocus();
        fireCount = myGroup.size();

        for(int i =0; i< fireCount; ++i)
        {

                new Thread(new Runnable(){
                        public void run()
                        {
                                fireNextItem( agendaFilter );

                        }
                }).start();

        }


I am getting an Errorjava.lang.NullPointerException because my code flow is
going to consequenceExceptionHandler ! = null exception.

else if ( this.consequenceExceptionHandler != null ) {

                    this.consequenceExceptionHandler.handleException(
activation, this.workingMemory.getKnowledgeRuntime(),
                                                                      e );


Could you kindly help me with this?

I am pasting the exception below and I am using Drools 5.4 Final version.

In DA: [Activation rule=Rule 1, act#=0, salience=0, tuple=[fact
0:0:1773684356:1306428912:0:DEFAULT:org.drools.reteoo.InitialFactImpl at 4dde85f0]
]
Exception in thread "Thread-1" Exception in thread "Thread-0" Exception
executing consequence for rule "Rule 1" in defaultpkg:
java.lang.NullPointerException
In DA WM: org.drools.impl.StatefulKnowledgeSessionImpl at 542487b1
In DA Errorjava.lang.NullPointerException
In DA: [Activation rule=Rule 2, act#=1, salience=0, tuple=[fact
0:0:1773684356:1306428912:0:DEFAULT:org.drools.reteoo.InitialFactImpl at 4dde85f0]
]
In DA WM: org.drools.impl.StatefulKnowledgeSessionImpl at 542487b1
In DA Errorjava.lang.NullPointerException
        at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
        at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
        at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1208)
        at org.drools.common.DefaultAgenda$1.run(DefaultAgenda.java:1471)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
        at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1272)
        ... 3 more
Exception executing consequence for rule "Rule 2" in defaultpkg:
java.lang.NullPointerException
        at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
        at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
        at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1208)
        at org.drools.common.DefaultAgenda$1.run(DefaultAgenda.java:1471)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
        at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1272)
        ... 3 more


Thanks a lot for the help.

Regards,
Malory



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