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List: jboss-user
Subject: [jboss-user] [jBPM] - Re: Session and thread safety
From: Michał_Mański <do-not-reply () jboss ! com>
Date: 2012-09-29 18:58:37
Message-ID: 2-723455-3-103348-1331679841628-2-762354-3-114905-1348945112602.jivesbs.jivemailuser () https://community ! jboss ! org
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Michał Mański [https://community.jboss.org/people/mmanski] created the discussion
"Re: Session and thread safety"
To view the discussion, visit: https://community.jboss.org/message/762354#762354
--------------------------------------------------------------
Hi,
I use JBPM 5.3.0.Final in my project. My application uses EJB 3.1/JPA 2.0 and runs on \
JBoss 7.1.1.Final. I have similar problem with thread safety. When I use one session \
for whole application, strange exceptions are thrown (e.g. \
"javax.persistence.PersistenceException: error during managed flush ... caused by: \
org.hibernate.AssertionFailure: collection [null] was not processed by flush()", \
"javax.persistence.PersistenceException: error during managed flush ... Caused by: \
java.util.ConcurrentModificationException" or "org.hibernate.HibernateException: \
Found two representations of same collection: \
org.jbpm.persistence.processinstance.ProcessInstanceInfo.eventTypes") if many users \
use the application simultaneously. I tried to use the \
ProcessPersistenceContextManager presented by Sebastian, but it didn't resolve the \
problem - errors still appear.
When I try to user another solution and create new session for every request, I don't \
know how to dispose sessions. I read in documentation that this method must always be \
called after finishing using the session, or the engine will not free the memory used \
by the session. However, I don't know how to correctly dispose a session.
If I try to dispose session before end of transaction, an exception is thrown during \
committing transaction: "javax.persistence.PersistenceException: error during managed \
flush ... Caused by: java.lang.IllegalStateException: Illegal method call. This \
session was previously disposed". On the other hand, if i dispose session after \
transaction commits, another exception is thrown: "Could not commit session: \
javax.persistence.TransactionRequiredException: No active JTA transaction on \
joinTransaction call".
Does anyone know what is the correct way to dispose a session?
--------------------------------------------------------------
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created by <a href="https://community.jboss.org/people/mmanski">Michał \
Mański</a> in <i>jBPM</i> - <a \
href="https://community.jboss.org/message/762354#762354">View the full discussion</a> \
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1px;">
<div class="jive-rendered-content"><p>Hi,</p><p>I use JBPM 5.3.0.Final in my project. \
My application uses EJB 3.1/JPA 2.0 and runs on JBoss 7.1.1.Final. I have similar \
problem with thread safety.</p><p>When I use one session for whole application, \
strange exceptions are thrown (e.g. "javax.persistence.PersistenceException: error \
during managed flush ... caused by: org.hibernate.AssertionFailure: collection [null] \
was not processed by flush()", "javax.persistence.PersistenceException: error during \
managed flush ... Caused by: java.util.ConcurrentModificationException" or \
"org.hibernate.HibernateException: Found two representations of same collection: \
org.jbpm.persistence.processinstance.ProcessInstanceInfo.eventTypes") if many users \
use the application simultaneously. I tried to use the \
ProcessPersistenceContextManager presented by Sebastian, but it didn't resolve the \
problem - errors still appear.</p><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>When I try to user another solution and create new session for \
every request, I don't know how to dispose sessions. I read in documentation that \
this method must always be called after finishing using the session, or the engine \
will not free the memory used by the session. However, I don't know how to correctly \
dispose a session. </p><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>If I try to dispose session before end of transaction, an \
exception is thrown during committing transaction: \
"javax.persistence.PersistenceException: error during managed flush ... Caused by: \
java.lang.IllegalStateException: Illegal method call. This session was previously \
disposed". </p><p>On the other hand, if i dispose session after transaction commits, \
another exception is thrown: "Could not commit session: \
javax.persistence.TransactionRequiredException: No active JTA transaction on \
joinTransaction call".</p><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>Does anyone know what is the correct way to dispose a \
session?</p></div>
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<p style="margin: 0;">Reply to this message by <a \
href="https://community.jboss.org/message/762354#762354">going to Community</a></p> \
<p style="margin: 0;">Start a new discussion in jBPM at <a \
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