Hi Julius,
Firstly i ll tell you the difference between synchronous and asychronous web services.
Synchronous services are characterized by the client invoking a service and then waiting for a response to the request. Because the client suspends its own processing after making its service request, synchronous services are best when the service can process the request in a small amount of time. Synchronous services are also best when applications require a more immediate response to a request. Web services that rely on synchronous communication are usually RPC-oriented. Generally, consider using an RPC-oriented approach for synchronous Web services.
With asynchronous services, the client invokes the service but does not -- or cannot -- wait for the response. Often, with these services, the client does not want to wait for the response because it may take a significant amount of time for the service to process the request. The client can continue with some other processing rather than wait for the response. Later, when it does receive the response, it resumes whatever processing initiated the service request.
As per my knowledge, it has nothing to do with the return type.
Now regarding your case where your service method's return type is String, it can be be synchronous as well as asynchronous.
Hope your doubt is clear.
Thanks
Sagar Ingalwar
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