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=?
list size:1
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
list size:2
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
list size:3
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=? Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?, OPTLOCK=? where id=? and OPTLOCK=?
list size:4
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.
View this message in context: Re: persisted StatefulKnowledgeSession failed to maintain the length of Sliding window?
Sent from the Drools: User forum mailing list archive at Nabble.com.