Java more than one DB connection in UserTransaction

Question

static void clean() throws Exception {
  final UserTransaction tx = InitialContext.doLookup(\"UserTransaction\");
  tx.begin();

  try {
    final DataSource ds = In         


        

Answer 1

My guess is that you have autocommit enabled on the connections. This is the default when creating a new connection, as is documented here https://docs.oracle.com/javase/tutorial/jdbc/basics/transactions.html

System.out.println(connection1.getAutoCommit());

will most likely print true.

You could try

connection1.setAutoCommit(false); 

and see if that changes the behavior.

In addition to that, it's not really defined what happens if you call close() on a connection and haven't issued a commit or rollback statement beforehand. Therefore it is strongly recommended to either issue one of the two before closing the connection, see https://docs.oracle.com/javase/7/docs/api/java/sql/Connection.html#close()

EDIT 1: If autocommit is false, the it's probably due to the undefined behavior of close. What happens if you switch the statements? :

st2.executeUpdate();
st2.close();
connection2.close();
st1.executeUpdate();
st1.close();
connection1.close();

EDIT 2: You could also try the "correct" way of doing it:

st1.executeUpdate();
st1.close();
st2.executeUpdate();
st2.close();
tx.commit();
connection1.close();
connection2.close();

If that doesn't fail, then something is wrong with your setup for UserTransactions.