This will load the JTA version of the transaction manager, rather than the JTS one. To loads the JTS one you need:

	ORB myORB = ORB.getInstance("test");
	RootOA myOA = OA.getRootOA(myORB);
	myORB.initORB(new String[] {}, null);
	myOA.initOA();

	ORBManager.setORB(myORB);
	ORBManager.setPOA(myOA);
	jtaPropertyManager.getJTAEnvironmentBean().setTransactionManagerClassName(com.arjuna.ats.internal.jta.transaction.jts.TransactionManagerImple.class.getName());
	jtaPropertyManager.getJTAEnvironmentBean().setUserTransactionClassName(com.arjuna.ats.internal.jta.transaction.jts.UserTransactionImple.class.getName());
	javax.transaction.TransactionManager tm = com.arjuna.ats.jta.TransactionManager.transactionManager();