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UserTransaction object in remote client

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Can anyone help me out here?

I am using JBoss 4.0.1 and I've deployed a Datasource "Test" to connect to Postgres database.

This is what my java client which is running in JVM outside JBoss.

1. Lookup "UserTransaction" object in JBoss namespace.
2. Lookup "Test" datasource in JBoss namespace. (With JBoss 3.2.x it is not possible, it's possible only in JBoss 4.0.x by setting "<use-java-context>false</use-java-context>" in -ds.xml to deploy dataosure.)
3. Begin UserTransaction, Get connection object and do some database updates & either commit or rollback usertransaction.
4. But UserTransaction is not working. My database updates are always committed.
I tested the same thing in EJB deployed on the JBoss and it works fine. The only problem is when I control the user transaction from outside JBoss JVM. I get no errors/exceptions but it doesnt work.

Here is the snippet of code.

InitialContext ctx = new InitialContext();
Object o1 = ctx.lookup("AgileITPTest");
DataSource datasource = (DataSource) PortableRemoteObject.narrow(o1, DataSource.class);
Object o = (UserTransaction) ctx.lookup("UserTransaction");
UserTransaction userTransaction = (UserTransaction)PortableRemoteObject.narrow(o, UserTransaction.class);

Connection conn = datasource.getConnection();
stat = conn.createStatement();
String sql_Outer = "insert into transac_order values(6421)";
} catch(Exception sle) {

Thanks in advance,
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