If you are dealing with a web service call using the Axis framework, there is a much simpler answer. If all want is for your client to be able to call the SSL web service and ignore SSL certificate errors, just put this statement before you invoke any web services:
System.setProperty("axis.socketSecureFactory",
"org.apache.axis.components.net.SunFakeTrustSocketFactory");
The usual disclaimers about this being a Very Bad Thing to do in a production environment apply.
I found this at the Axis wiki.