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GWT-RPC: hacked attempt on request payload.

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My test team try to hack on the system, they found out that GWT-RPC call returned a sensitive information (class name as emphasis as below) in response format "//EX" message. I'm amazed that I can't find any postings on this issue.

HTTP Request (Request payload):


HTTP Response:

//EX[2,1,["","This application is out of date, please click the refresh button on your browser. ( Blocked attempt to access
interface 'abc', which is not implemented by 'com.testProject.client.customerClassService'; this is either misconfiguration or a hack attempt)"],0,7]

Specially the part that says "either misconfiguration or a hack attempt". In my case is hack attempt as HTTP Response, because the exception states that 'abc' is not implemented by 'com.testProject.client.customerClassService'.

Any ideas to hide the sensitive information (class name) in the error message as above ? I try with all browsers available it is not from the browser.

Urgent. Any help will be appreciated.
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