[jboss-jira] [JBoss JIRA] Created: (JBRULES-1279) Memory leak in release 4.0.2

[Paul Jackson (JIRA)]

Memory leak in release 4.0.2
----------------------------

                 Key: JBRULES-1279
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1279
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 4.0.2
         Environment: tested with windows jdk5 and jdk6
            Reporter: Paul Jackson
         Assigned To: Mark Proctor


I  have observed memory leaks in our application after upgrading to the latest 4.0.2 release. I have replicated the problem with the sample code below:

DroolsTest.java

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

import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.StatefulSession;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;

public class DroolsTest {

	public void run() throws Exception {
		
		RuleBase ruleBase = createRuleBase();

		long counter = 0;
		while(true) {
			StatefulSession session = ruleBase.newStatefulSession(false);
			if(++counter % 100 == 0) {
				System.out.println(counter);
			}
			session.dispose();
		}
	}
	
	private RuleBase createRuleBase() throws Exception {
		Reader source = new InputStreamReader( this.getClass().getResourceAsStream( "HelloWorld.drl" ) );

		PackageBuilder builder = new PackageBuilder();
		builder.addPackageFromDrl( source );
		if ( builder.hasErrors() ) {
		    System.out.println( builder.getErrors().toString() );
		    throw new RuntimeException( "Unable to compile \"HelloWorld.drl\".");
		}
		Package pkg = builder.getPackage();
		
		RuleBase ruleBase = RuleBaseFactory.newRuleBase();
		ruleBase.addPackage( pkg );

		return ruleBase;
	}
	
	public static void main(String[] args) throws Exception {
		new DroolsTest().run();
	}
}

HelloWorld.drl

#list any import classes here.



#declare any global variables here




rule "Your First Rule"
	
	when
		#conditions
	then 
		#actions
		
end

rule "Your Second Rule"
	#include attributes such as "salience" here...
	when
		#conditions
	then 
		#actions
		
end

When I run this with release 4.0.1 I have to manually break the program to get it to stop.

When I run with release 4.0.2 it reaches about 14000 iterations before crashing with an out of memory error.




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