GWT-RPC responses have a string table to deduplicate strings and minimize 
the response size. When deserializing a server response the code will try 
to lookup a type signature string in the string table, however in your case 
the lookup returns wrong data and serialization fails. "153221" is not a 
type signature but some other data you have transferred, maybe a variable 

Usually it means your GWT versions are out of sync. Make double sure to 
deploy the gwt-servlet.jar from GWT 2.8.2 and not the one of GWT 2.6.1 to 
your server. Then make double sure you are actually compile your app with 
GWT 2.8.2 and not with 2.6.1.

-- J.

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