[jboss-user] [EJB 3.0] New message: "Re: Entity Manager with BMT and Transaction Timeout"
User development,
A new message was posted in the thread "Entity Manager with BMT and Transaction
Timeout":
http://community.jboss.org/message/528562#528562
Author : Alexander Hartner
Profile : http://community.jboss.org/people/ejb3workshop
Message:
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Thanks for responsing. Here is my bean code.
First the MDB which shows the injection of an entityManager, usertransaction and a
datasource:
...
@MessageDriven(name = "WorkListener", activationConfig = {
@ActivationConfigProperty(propertyName = "acknowledgeMode",
propertyValue = "Auto-acknowledge"),
@ActivationConfigProperty(propertyName = "destinationType",
propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty(propertyName = "destination", propertyValue =
"queue/abc/WorkMessages")
})
@TransactionManagement(TransactionManagementType.BEAN)
public class WorkListener implements MessageListener {
@PersistenceContext(unitName = "entityManager")
protected EntityManager entityManager;
@Resource(name = "jdbc/abcDSNoTX")
DataSource datasource;
@Resource
private UserTransaction userTransaction;
public void onMessage(Message message) {
try {
Processor processor = new Processor(entityManager, userTransaction,
datasource);
processor.process(message);
....
Then further down the stack we begin a new userTransaction and load some entity via the
entity manager
...
m_userTransaction.begin();
Account account = m_entityManager.find(Account.class, accountId);
...
account.getRelatedAccounts();
However further down the stack we access a collection on the account which loads further
linked entities and failes with the LazyInitializationException.
This problem only occurs under load and is most likely caused by a slow down while
accessing the database. However I am not too concerned about performance at this stage,
just want to know how I can debug this issue and see what happened to my entity manager
session. My suspicion is that since I am using a User Transaction that the global timeout
which I set to 3600 (=1 hour) is not applied. If this is the case where do you set the
default transaction timeout for a user transaction or the hibernate session. Usually the
first time the exception is thrown is between 20 and 30 minutes after submitting a large
volume of work.
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