[jboss-jira] [JBoss JIRA] (DROOLS-182) Timed rules can disrupt other activations as they are being fired

[RH Bugzilla Integration (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12795885#comment-12795885 ] 

RH Bugzilla Integration commented on DROOLS-182:
------------------------------------------------

Mario Fusco <mfusco at redhat.com> made a comment on [bug 995198|https://bugzilla.redhat.com/show_bug.cgi?id=995198]

String drl = "package org.drools.test; \n" +
"import org.drools.Person; \n " +
"global java.util.List list; \n" +
"\n" +
"\n" +
"rule TimeConsumingRule\n" +
"when \n" +
" $p : Person( $n : name ) \n" +
"then \n" +
" System.out.println( Thread.currentThread().getName() + \"Ill continue later \" ); \n" +
" Thread.sleep( 1000 ); \n" +
" System.out.println( Thread.currentThread().getName() + \"Hello >> \" + $n );\n" +
"end\n" +
"\n" +
"rule PreemptingRule\n" +
"timer( expr:0 )\n" +
"when\n" +
" $p : Person()\n" +
"then\n" +
" System.out.println( Thread.currentThread().getName() + \"Take out \" + $p ); \n" +
" retract( $p );\n" +
"end\n" +
"\n"
;

This particular test case throws a NPE when the accessor $n tries to read the - retracted - Person's name. The exception is not thrown when the time is > 0
                
> Timed rules can disrupt other activations as they are being fired
> -----------------------------------------------------------------
>
>                 Key: DROOLS-182
>                 URL: https://issues.jboss.org/browse/DROOLS-182
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.5.1.Final, 6.0.0.Beta3
>            Reporter: Davide Sottara
>            Assignee: Mark Proctor
>            Priority: Blocker
>
> Timer-driven rules are executed by separated thread. One such thread may retract a fact which is being used by the (main) thread in a rule being fired. This preemption will lead to a NPE

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