"axis2_svc_client_get_last_response_has_fault" return 0 even when there is really soap fault returned.

"axis2_svc_client_get_last_response_has_fault" return 0 even when there is really soap fault returned.
I have used "axiom_node_to_string" to print the returned soap body by the peer service(which is developed by Java and deployed by JBoss), and it reads:

<env:Fault xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"><faultcode>env:Client</faultcode><faultstring>Cannot find child element: String_1</faultstring></env:Fault>

But "axis2_svc_client_get_last_response_has_fault" really returns 0 on it.