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Also, Make sure the service type in your login-config.xml file matches the transaction type in your "-ds.xml" file. EX:

if your "-ds.xml" entry tooks like:

<xa-datasource>
    <jndi-name>SomeDS</jndi-name>
        <security-domain>SomeDomain</security-domain>
  </xa-datasource>

Then the service type in the login-config.xml for the corresponding domain should look like :

<module-option name = "managedConnectionFactoryName">jboss.jca:name=SomeDS,service=XATxCM</module-option>

But,

if your "-ds.xml" entry tooks like:

<local-tx-datasource>
    <jndi-name>SomeDS</jndi-name>
        <security-domain>SomeDomain</security-domain>
  </local-tx-datasource>

Then the service type in the login-config.xml for the corresponding domain should look like :

<module-option name = "managedConnectionFactoryName">jboss.jca:name=SomeDS,service=LocalTxCM</module-option>