UserTranaction utx = null;
try {
Context ctx = new InitialContext();
utx = (UserTransaction) ctx.lookup("java:/comp/UserTransaction");
utx.begin();
UserHome userHome = (UserHome) ctx.lookup("User");
User user = userHome.findByPrimaryKey(Integer.valueOf("9"));
user.setName("user1");
ClassanduserHome home = (ClassanduserHome) ctx.lookup("Classanduser");
Classanduser classanduser = home.create(Integer.valueOf("2"), Integer.valueOf("2"));
utx.commit();
System.out.println(classanduser.getClassID());
}
catch (Exception e) {
System.out.println(e.getMessage());
}

Classanduser classanduser = home.create(Integer.valueOf("2"), Integer.valueOf("2")); throw Exception
user.setName("user1") can rollback

but when replace user.setName("user1") with
user.remove() or userHome.create("user2")
it can't rollback

who can help me please!