Hi, all:

     I'm a newbie to Drools.

     I'm trying to restore stateful knowledge session using JPAKnowledgeService after restarting server.

     In my rules I use Drools Fusion's Sliding Length Window to processing events. Below is a sample:

     package com.sample
     import com.sample.Event;
     import java.util.List;

     declare Event
	@role(event)
     end

      rule "test"
             when
		$list : List() from collect(Event() over window: length(2))
	     then
		System.out.println("list size:" + $list.size());
      end
     
      And I have done what should be done according to the manual reference. When I running my test 

case below:

       @Test
	public void test_persistedsession() {
		KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
		loadDRL(kbase);
		
		Environment env = KnowledgeBaseFactory.newEnvironment();
		env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" ) );
		env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());
		
		//create a persisted statefulknowledgesession
		StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env);
		ksession.insert(new Event());
		ksession.fireAllRules();
		
		ksession.insert(new Event());
		ksession.fireAllRules();
		
		//reload the persisted session
		ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(ksession.getId(), kbase, null, env);
		
		ksession.insert(new Event());
		ksession.fireAllRules();
		
		ksession.insert(new Event());
		ksession.fireAllRules();
	}
 

        Then I found that the result is:

Hibernate: insert into SessionInfo (id, lastModificationDate, rulesByteArray, startDate, OPTLOCK) values (null, ?, ?, ?, ?)
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
<b>list size:1</b>
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
<b>list size:2</b>
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
<b>list size:3</b>
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
<b>list size:4</b>
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?

As I have declared that the length of window is 2, how can the size of list increase to 3, 4 and more?  

I am using the 5.2.0 final. May be I have missed something, please help me.
       Any help will be appreciated.

	
	
	
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