It sounds like you have a soap formatting issue. The java client isn't generating soap XML that makes sense to the WCF service. To get an idea of what the soap XML the service is expecting use the WcfTestClient command line app to call the service.
This app dynamically creates a service proxy in a WinForm app. In the app, call the service operation and click the XML tab (next to the Formatted tab at the bottom of the right pane). You'll see both the request & response soap in this tab.
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