how to use jboss7 xa-datasource

[paffli]

I  get a dataSource by using jboss jndi  ,but I want to get a XaResouce to operate  transaction.

when I cast the class,a error occur:

20:17:26,477 ERROR [stderr] (http--127.0.0.1-8080-1) java.lang.ClassCastException: org.jboss.jca.adapters.jdbc.xa.XAManagedConnection cannot be cast to org.jboss.jca.adapters.jdbc.xa.XAManagedConnection.

[wdfink]

You need to configure the datasource as XA. See Admin Guide for that.

The simple way is to use the CLI command (bin/jboss-cli.*) with the tab-completion. Use the command xa-data-source.

[paffli]

I hava used the xa-data-source. we can know I hava already get  a XAManagedConnection  by  the error information , if I user reflect ,xa is work well.