[jboss-jira] [JBoss JIRA] Created: (JBRULES-1050) Extra space between variable and field name in LHS causes crash

[Alexandre Gattiker (JIRA)]

Extra space between variable and field name in LHS causes crash
---------------------------------------------------------------

                 Key: JBRULES-1050
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1050
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions:  4.0.0.GA
            Reporter: Alexandre Gattiker
         Assigned To: Mark Proctor


Writing a condition as "$co:Item(attachment in ($c, $c. parent))" fails at runtime with an uninformative exception. Removing the extra space and writing "$c.parent" corrects the problem.

Below is the rule file, sample code and exception trace.

package com.sample
 
import com.sample.DroolsTest.Child;
import com.sample.DroolsTest.Parent;
import com.sample.DroolsTest.Item;
 
rule "My Rule"
	
	when
		$c:Child()
		$co:Item(attachment in ($c, $c. parent))
	then
		System.out.println("wawa");
end


package com.sample;

import java.io.InputStreamReader;
import java.io.Reader;

import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.event.DebugWorkingMemoryEventListener;
import org.drools.rule.Package;

/**
 * This is a sample file to launch a rule package from a rule source file.
 */
public class DroolsTest {

	public static final void main(String[] args) {
		try {
			RuleBase ruleBase = readRule();
		} catch (Throwable t) {
			t.printStackTrace();
		}
	}

	private static RuleBase readRule() throws Exception {
		Reader source = new InputStreamReader(DroolsTest.class
				.getResourceAsStream("/Sample.drl"));
		PackageBuilder builder = new PackageBuilder();
		builder.addPackageFromDrl(source);
		Package pkg = builder.getPackage();
		RuleBase ruleBase = RuleBaseFactory.newRuleBase();
		ruleBase.addPackage(pkg);
		return ruleBase;
	}

	public static class Parent {
	}

	public static class Child {
		private Parent parent;

		public Parent getParent() {
			return parent;
		}

	}

	public static class Item {
		private Object attachment;

		public Object getAttachment() {
			return attachment;
		}

	}

}


java.lang.NullPointerException
	at org.drools.reteoo.builder.PatternBuilder.createConstraints(PatternBuilder.java:128)
	at org.drools.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.java:72)
	at org.drools.reteoo.builder.PatternBuilder.build(PatternBuilder.java:54)
	at org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:112)
	at org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:70)
	at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:136)
	at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:109)
	at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:116)
	at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:262)
	at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:333)
	at com.sample.DroolsTest.readRule(DroolsTest.java:33)
	at com.sample.DroolsTest.main(DroolsTest.java:20)



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