We have one deployment of a GWT app where there is a Fortiweb firewall that 
blocks every GWT RPC call because it recognizes every call as a Java Method 
Injection attack. This seems to be caused by the presence of the pattern 
"java.lang." in the messages from the client to the server like the 
following:

7|0|7|https://host/app/app_gui/|BD9331DABCA5012FC56F3600DF03415F|com.app.gui.client.Bridge|getClientConfiguration|java.lang.St
 
ring/2004016611|john|ADMINISTRATOR|1|2|3|4|2|5|5|6|7|

My idea is to convince the firewall administrator that these are 
false-positives as these calls are part of the GWT RPC mechanism that does 
not allow arbitrary java code execution on the server side.

Is my reasoning correct or am I not worried enough?

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