UserTransaction tx=null;
      try {
         tx =(UserTransaction)new InitialContext().lookup("java:comp/UserTransaction");
         dao.addUser(user);
         tx.commit();

      } catch (Exception e) {
         if(tx!=null)
            tx.rollback();
         throw new Exception(e);
         
      }

13:19:02,687 INFO  [STDOUT] session closed
13:19:05,859 INFO  [STDOUT] filter starts
13:19:06,125 INFO  [Environment] Hibernate 2.1 beta 5
13:19:06,156 INFO  [Environment] hibernate.properties not found
13:19:06,156 INFO  [Environment] using CGLIB reflection optimizer
13:19:06,171 INFO  [Configuration] Configuration resource: /hibernate.cfg.xml
13:19:06,421 INFO  [Configuration] Mapping resource: User.hbm.xml
13:19:06,703 INFO  [Binder] Mapping class: com.up.cip.po.User -> user
13:19:06,984 INFO  [Configuration] Configured SessionFactory: null
13:19:06,984 INFO  [Configuration] processing one-to-many association mappings
13:19:06,984 INFO  [Configuration] processing one-to-one association property re
ferences
13:19:06,984 INFO  [Configuration] processing foreign key constraints
13:19:07,046 INFO  [Dialect] Using dialect: net.sf.hibernate.dialect.MySQLDialec
t
13:19:07,046 INFO  [SettingsFactory] Use outer join fetching: true
13:19:07,093 INFO  [NamingHelper] JNDI InitialContext properties:{}
13:19:07,093 INFO  [DatasourceConnectionProvider] Using datasource: java:/mysqld
atasource
13:19:07,109 INFO  [TransactionFactoryFactory] Transaction strategy: net.sf.hibe
rnate.transaction.JTATransactionFactory
13:19:07,109 INFO  [NamingHelper] JNDI InitialContext properties:{}
13:19:07,125 INFO  [TransactionManagerLookupFactory] No TransactionManagerLookup
configured (in JTA environment, use of process level read-write cache is not re
commended)
13:19:07,125 INFO  [TransactionManagerLookupFactory] No TransactionManagerLookup
configured (in JTA environment, use of process level read-write cache is not re
commended)
13:19:07,390 INFO  [SettingsFactory] Use scrollable result sets: true
13:19:07,390 INFO  [SettingsFactory] JDBC 2 max batch size: 20
13:19:07,390 INFO  [SettingsFactory] echoing all SQL to stdout
13:19:07,390 INFO  [SettingsFactory] Query language substitutions: {}
13:19:07,390 INFO  [SettingsFactory] cache provider: net.sf.hibernate.cache.JCSC
acheProvider
13:19:07,406 INFO  [Configuration] instantiating and configuring caches
13:19:07,812 INFO  [SessionFactoryImpl] building session factory
13:19:08,421 INFO  [SessionFactoryObjectFactory] no JNDI name configured
13:19:08,609 ERROR [STDERR] java.lang.IllegalStateException: No transaction.
13:19:08,609 ERROR [STDERR]     at org.jboss.tm.TxManager.rollback(TxManager.jav
a:272)
13:19:08,609 ERROR [STDERR]     at org.jboss.tm.usertx.client.ServerVMClientUser
Transaction.rollback(ServerVMClientUserTransaction.java:134)

<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="connection.datasource">java:/mysqldatasource</property>
        <property name="show_sql">true</property>
        <property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.jdbc.batch_size">20</property>
         
        <!-- Mapping files -->
        <mapping resource="User.hbm.xml"/>
       
    </session-factory>

</hibernate-configuration>