[jboss-jira] [JBoss JIRA] Created: (JBRULES-579) NPE when imports not available

[Edson Tirelli (JIRA)]

NPE when imports not available
------------------------------

                 Key: JBRULES-579
                 URL: http://jira.jboss.com/jira/browse/JBRULES-579
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 3.1-m1
            Reporter: Edson Tirelli
         Assigned To: Mark Proctor


REPORTED BY DIRK BERGSTROM:
------------------------------------------------

Trying to compile this rule, I get an NPE:

package foo;
rule "Generates NPE"
  when
    $count : Thing( size > 0 ) from collect( Gizmo( length == 1 ) )
  then
    System.out.println("boo");
end

Like so:

java.lang.NullPointerException
at org.drools.rule.Rule.addDeclarations(Rule.java:316)
at org.drools.rule.Rule.addPattern(Rule.java:304)
at org.drools.semantics.java.RuleBuilder.build(RuleBuilder.java:320)
at org.drools.semantics.java.RuleBuilder.build(RuleBuilder.java:215)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:366)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:215)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:181)
at net.juniper.dash.DroolsTest.readRule(DroolsTest.java:106)
at net.juniper.dash.DroolsTest.main(DroolsTest.java:22)

This happens when there are two undefined classes referenced in a rule, with the
second one inside a collect() statement.  If I import Thing, or import Gizmo, or
have a constraint on Gizmo not in a collect(), I get a parser exception, as
expected.

This is with Trunk, revision 8110.

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