Associations between Transaction and Connection?

[cool_xiong]

How jboss associates database connection(java.sql.Connection) with transaction?

example

 xxmethod {
 ...
 UserTransaction ut = ctx.lookup("UserTransaction");
 ut.begin();
 call xx.method1();
 call xx.method2();
 ut.commit;
 ...
 }
 public class xx {
 public static void method1() {
 ...
 DataSource ds = ctx.lookup("java:/xxDS");
 Connection con = ds.getConnection();
 ...
 con.close();
 }

 public static void method1() {
 ...
 DataSource ds = ctx.lookup("java:/xxDS");
 Connection con = ds.getConnection();
 ...
 con.close();
 }
 }

In this example, connection in method1 is different instance from connection in method2. when method1 success, connection is freed to Connection Pool? if it is, where transaction with connetion in method1 go? where is transaction info kept? In TM?

thanks

[cool_xiong]

Because JDBC comments as following:

Note: By default a Connection object is in auto-commit mode, which means that it automatically commits changes after executing each statement. If auto-commit mode has been disabled, the method commit must be called explicitly in order to commit changes; otherwise, database changes will not be saved.

Then, if connection in method1 close, it seems transaction will be commit or rollback, decided by con.isAutoCommit().

please tell me why transaction info from method1 can be kept after connection be closed.

Thanks.

[cool_xiong]

I made a mistake.

:P