title: UserTransactionAdapter vs UserTransactionImpl
body: <p>Does spring contain a jta implementation ?</p>
  
  <p>I see that class <a href="http://docs.spring.io/autorepo/docs/spring/4.2.x/javadoc-api/org/springframework/transaction/jta/UserTransactionAdapter.html" rel="nofollow">UserTransactionAdapter</a> implements <a href="https://docs.oracle.com/javaee/6/api/javax/transaction/UserTransaction.html" rel="nofollow">UserTransaction</a> but javax.transaction.UserTransaction don't exists in any spring jar.</p>
  
  <p>In the other hand javax.transaction.UserTransaction exist in jboss runtime library but the implementation is in spring jar. And another UserTransaction (from jbossxts-4.17.21.Final-redhat-2.jar) implementation: UserTransactionImpl can be found in jbossxts-4.17.21.Final-redhat-2.jar in jboss modules folder.</p>
  
  <p>Can someone explain this to me ?</p>