javax.persistence.TransactionRequiredException的可能原因

Question

What are the possible causes of a TransactionRequiredException?

javax.ejb.EJBTransactionRolledbackException: JBAS011469:
Transaction is required to perform this operation
(either use a transaction or extended persistence context)

We have a setup where we run tests from a normal JVM towards an application container (jboss 7) over the JNDI interface. We have a nightly build that runs this code every night and it usually succeeds. Sometimes however, after a certain time of execution, all tests starts to fail with the above exception without any code change. Can any external issues cause this. We have disk space, and since the exceptions are passed over the network I think the network is also good. Can any of the following cause an exception like this:

• Lack of file descriptors
• Hibernate having problems talking to the database (mysql)
• CPU load
• Out of memory

Sorry if the question got a bit abstract, but I cannot get my head around this one. All solutions and debugging suggestions are more then welcome.

Answer 1

I found my answer in the server.log jboss provides. The log shows that at the time when the tests starts to fail, this class:

org.hornetq.core.client

throws

Throwable: java.lang.OutOfMemoryError: unable to create new native thread

So an OutOfMemoryError can cause

javax.ejb.EJBTransactionRolledbackException: JBAS011469:
Transaction is required to perform this operation
(either use a transaction or extended persistence context)