title: JTA Transaction Rollback exception?
body: <p>I am using JTA Atomikos transaction with multiple datasource configuration in tomcat server.
  Sometimes am getting the following exception:</p>
  
  <blockquote>
    <p>JTA transaction unexpectedly rolled back (maybe due to a timeout);
    nested exception is javax.transaction.RollbackException: The
    transaction was set to rollback only</p>
  </blockquote>
  
  <p>What would be the cause for this exception ?</p>