J2EE containers are required to make the UserTransaction object available to enterprise
beans and web components under the name java:comp/UserTransaction. If the
JtaDbPersistenceService runs outside an EJB or web component, the user transaction will be
unavailable under that name.
Set the jta.UserTransaction property in your hibernate configuration to the global JNDI
name under which the application server provides the UserTransaction object. For JBoss AS
the correct value is "UserTransaction".
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