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While making a request to an ArcWeb Service with Glue toolkit the following error message may appear:
"java.lang.IllegalStateException: Could not find method for proxy invocation.
Class class esri.arcwebservices.* was passed in. Please check that you are reading in map files."
The mapping files, or .map files under the WEB-INF/maps directory, were not read properly.
Verify the location and permissions of the mapping files.