Java.lang.IllegalArgumentException?

Check with Wireshark what goes over the wire and diff the . NET request with the java request.

Looks like your web application was receiving a message, and one of its fields failed verification that it was the right type (or acceptable value). Whether that was a data issue, or a coding issue depends heavily on the data, code, and intent which are all not provided.

As you can see from the class names in the stack trace, the exception is thrown during deserialization of the webservice response. The exception itself is pretty generic and hence carries little useful information. Try looking at the response sent over the wire, or set an exception breakpoint in eclipse so you can inspect the stack frames the exception is thrown to get additional context.(To ease interpretation of what went wrong, you'll probably want to procure the source code of your web service stack).

Look in the code for something is parsed for user input like this Integer I = Integer. ParseInt("string"); and the "string" contains none valid number.

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