How to Invoking a flow service through java client?

IData out= context.invoke("namespace", "service name", "input);
out : IData where does java store the output of the webMethods service.
namespace : The folder where do you store your service in the webMethods. (eg : "pub.flow")

service name : Service name which will you call from java code.

input : IData input of the service that want to be called.