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

[Edson Tirelli (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-1050?page=all ]

Edson Tirelli reassigned JBRULES-1050:
--------------------------------------

    Assignee: Edson Tirelli  (was: Mark Proctor)

> 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: Edson Tirelli
>
> 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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