[jboss-jira] [JBoss JIRA] Created: (JBRULES-1006) NullPointerException when using "from collect"

[Brian Stiles (JIRA)]

NullPointerException when using "from collect"
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                 Key: JBRULES-1006
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1006
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Brian Stiles
         Assigned To: Mark Proctor


It seems that using more than one rule with "from collect"--or possibly "from collect ( Foo() from someCall() )--causes Declaration.getPattern().getOffset() to be incorrect, resulting in a NullPointerException in ReteTuple.get(int).  This should be more clear after running the included code.

The following test case demonstrates the problem.

--

package sample;

import java.io.StringReader;
import java.util.HashSet;
import java.util.Set;

import org.drools.RuleBase;
import org.drools.RuleBaseConfiguration;
import org.drools.RuleBaseFactory;
import org.drools.StatefulSession;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageBuilderConfiguration;

public class FromProblem {

    public static void main(String[] args) throws Exception {

        final PackageBuilderConfiguration packageBuilderConfiguration =
                new PackageBuilderConfiguration();
        final PackageBuilder packageBuilder = new PackageBuilder(packageBuilderConfiguration);

        packageBuilder.addPackageFromDrl(new StringReader("\n"
                + "package sample\n"
                + "\n"
                + "import java.util.ArrayList;"
                + "import sample.FromProblem;"
                + "global sample.FromProblem x;"
                + "\n"
                + "rule MyRule\n"
                + "    dialect \"java\"\n"
                + "\n"
                + "    when\n"
                + "        $i : ArrayList() from collect(Integer() from x.getIntegers())\n"
                + "        $k : ArrayList() from collect(Integer() from x.getIntegers())\n"
                + "    then \n"
                + "        System.out.println($i);\n"
                + "        System.out.println($k);\n"
                + "end \n"));

        final RuleBaseConfiguration ruleBaseConfiguration = new RuleBaseConfiguration();
        final RuleBase ruleBase = RuleBaseFactory.newRuleBase(ruleBaseConfiguration);

        ruleBase.addPackage(packageBuilder.getPackage());

        final StatefulSession session = ruleBase.newStatefulSession();
        session.setGlobal("x", new FromProblem());
        session.fireAllRules();
    }

    public Set<Integer> getIntegers() {
        final HashSet<Integer> set = new HashSet<Integer>();
        set.add(1);
        return set;
    }
}



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