Hi,
I found the solution .
just need to put these properties in the persistence.xml file and it all works fine..
<code>
<persistence-unit name="jdbcService" transaction-type="JTA">
........
<property name="jboss.entity.manager.jndi.name" value="java:/jdbcService"></property>
<property name="jboss.entity.manager.factory.jndi.name"value="java:/jdbcServiceFactory" ></property>
</code>
thanks for all your kind support.....:)
Amit