org/jboss/ws/core/jaxws/handler/MessageContextJAXWS.java lines 138,139:
InputSource inputSource = new InputSource(wsdlURL.openStream());
put(MessageContext.WSDL_DESCRIPTION, inputSource);

The URL opened by openStream() never gets closed and leads to "Too many open files" issues. It should be read into the memory and then put to the message if that was not a performance overwhelm.