Re: Logout then login error (Exception while dispatching incoming RPC call: javax.servlet.ServletException: Content-Type was '(null)'. Expected 'text/x-gwt-rpc'.)

The exception itself is pretty clear: GWT-RPC checks if a GWT-RPC request has the HTTP header "Content-Type: text/x-gwt-rpc". If GWT can not find that header or the header has no value then it throws the above exception.

So in your setup something is messing up that HTTP header. So I guess you have to debug a server request to figure out who is responsible for the issue. Also figure out if you have a proxy server in front of your app servers and if that proxy server works correctly.

-- J.

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