The easiest way to write a Java SOAP client that uses a non-wsdl PHP SOAP server?

I have successfully written PHP servers and SOA clients without using wsdl. However, I do not know how to use one of my non-wsd SOAP servers using the Java SOAP client.

Can someone please provide me with an easy way to do this, preferably without external libraries.

Assuming http://example.com/SOAP/m1/server.php is the URL where the PHP SOAP server is located.