I would suggest using the plugins SDK. When creating a hook, portlet, ext environment you can use the build in ant script to run "ant build-wsdd". Typically the way I have done it is create a service that has no column names, just an entity. Generate the service using the "ant build-service". Make sure you set the entity you have created as remote-service="true". Implement the methods after doing a "ant build-service". You will need to make sure you set the property in the portal-ext.properties file with this property:
# Axis Servlet
##
#
# Input a list of comma delimited IPs that can access this servlet. Input a
# blank list to allow any IP to access this servlet. SERVER_IP will be
# replaced with the IP of the host server.
#
#axis.servlet.hosts.allowed=127.0.0.1,SERVER_IP
axis.servlet.hosts.allowed=
Deploy your portlet and use:
http:\\domainname+"\"+hookname(or portlet)+"\axis"
