raise takes a string when re-raising as a different exception class.

Author: Trevor Hart

lib/resque/helpers.rb

@@ -29,7 +29,7 @@ def decode(object)
       begin
         ::MultiJson.decode(object)
       rescue ::MultiJson::DecodeError => e
-        raise DecodeException, e
+        raise DecodeException, e.message, e.backtrace
       end
     end