How to solve RPC error: Character Encoding is 'text/'. Expected 'UTF-8'

Sometimes I do get the following stacktrace during RPC communication with the Tomcat backend.

Any idea how to solve this, and what could cause this ?

- Ed

javax.servlet.ServletException: Character Encoding is 'text/'. Expected 'UTF-8'      at com.google.gwt.user.server.rpc.RPCServletUtils.checkCharacterEncodingIgnoreCase(RPCServletUtils.java:439)      at com.google.gwt.user.server.rpc.RPCServletUtils.readContent(RPCServletUtils.java:212)      at com.google.gwt.user.server.rpc.RPCServletUtils.readContentAsGwtRpc(RPCServletUtils.java:252)      at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.readContent(AbstractRemoteServiceServlet.java:182)

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