title: Are server 500 errors a security issue?
body: <p>I've found that it's possible to cause 500 errors on a server using curl and a faked GWT-Permutation with a POST payload. The payload is generating a java.lang.Exception on an Apache server. </p>
  
  <p>Does this open up a security issue? Should I report it to Google's GWT support?</p>
  
  <p>To clarify the question: Would a significant number of server errors be a concern as a denial of service. I.e. could they exhaust server resources. (Sorry, if this is too hypothetical). </p>
  
  <pre><code>SEVERE: Exception while dispatching incoming RPC call
  java.lang.NumberFormatException: Expected type 'int' but received a non-numerical value: 
      at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.getNumberFormatException(ServerSerializationStreamReader.java:999)
      at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.readInt(ServerSerializationStreamReader.java:537)
      at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.readString(ServerSerializationStreamReader.java:582)
      at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.prepareToRead(ServerSerializationStreamReader.java:488)
      at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:240)
      at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:206)
      at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
      at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
      at java.lang.Thread.run(Thread.java:662)
  </code></pre>
  
  <p>Thanks!
  Dave</p>