WSDL Bindings For EJBs, JMS, JCA...
WSIF defines additional binding extensions so that EJBs, local java classes, software accessible over message queues using the JMS API and software that can be invoked using the Java Connector architecture can also be described in WSDL. WSIF is packaged with providers that allow transparent invocation of such software given the corresponding WSDL description.
Read more about this topic: Web Services Invocation Framework