Implementation of transaction using JNDI in java

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Java

I have below mentioned method for implementing UserTransaction in JNDI



private UserTransaction getUserTransactionFromJNDI() {
InitialContext context;
Object result;
try {
context = new InitialContext();
result = context.lookup("java:comp/UserTransaction"); // lookup in
// JBossAS
} catch (NamingException ex) {
throw new RuntimeException("UserTransaction could not be found in JNDI", ex);
}
return (UserTransaction) result;
}


And created context.xml and web.xml with following code
context.xml
<Resource
name="UserTransaction"
auth="Container"
type="javax.transaction.UserTransaction"
factory="org.jnp.interfaces.NamingContextFactory"/>

web.xml
<resource-ref>
<description>for implementing Transaction
<res-ref-name>UserTransaction
<res-type>javax.transaction.UserTransaction
<res-auth>Container


But i can get error javax.naming.NamingException: Cannot create resource instance
What i can do?

What I have tried:

Already tried solution shown in above