[jboss-jira] [JBoss JIRA] (DROOLS-165) Fail-fast mode when a global is not defined at session start

[Jan Hustak (JIRA)]

Jan Hustak created DROOLS-165:
---------------------------------

             Summary: Fail-fast mode when a global is not defined at session start
                 Key: DROOLS-165
                 URL: https://issues.jboss.org/browse/DROOLS-165
             Project: Drools
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
    Affects Versions: 6.0.0.Beta3
            Reporter: Jan Hustak
            Assignee: Mark Proctor
            Priority: Minor


The following DRL causes an infinite loop when run without setting the "missing" global:

    global java.util.Collection missing
    dialect "mvel"

    rule "toInfinityAndBeyond"
      when
      then
        x = missing[3]
    end

because it triggers https://jira.codehaus.org/browse/MVEL-290

Even though the core issue is in MVEL I would really like an option to fail fast when a global is undefined at the very start of a session. I don't know about others but I never define globals from within the rules and I've had all sorts of trouble with missing globals - the infinite loop was just the last straw.

Of course, a global may legitimately be defined as null (which would also trigger the MVEL bug). So perhaps the fail-fast mode could be enabled on a case-by-case basis:

    global required java.util.Collection basicHelpers

Sorry if this has been suggested before, I couldn't find any pertinent discussions.

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