title: Exception while dispatching incoming RPC call java.lang.NoSuchMethodError: com.google.gwt.user.server.rpc.RPCRequest
body: <p>I have GWT page with Hibernate and MySQL setup already.  I'm running it in SuperDev mode and here is the error I get after compiling the page:</p>
  
  <pre><code> [WARN] Exception while dispatching incoming RPC call
  java.lang.NoSuchMethodError: com.google.gwt.user.server.rpc.RPCRequest.&lt;init&gt;(Ljava/lang/reflect/Method;[Ljava/lang/Object;Lcom/google/gwt/user/server/rpc/SerializationPolicy;)V
      at com.google.gwt.user.server.rpc.RPCCopy_GWT15.decodeRequest(RPCCopy_GWT15.java:278)
      at com.google.gwt.user.server.rpc.RPCCopy.decodeRequest(RPCCopy.java:136)
      at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:143)
      at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:305)
      at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
      at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
      at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
      at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
      at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
      at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:68)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
      at org.eclipse.jetty.server.Server.handle(Server.java:370)
      at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
      at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
      at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
      at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
      at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
      at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
      at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
      at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
      at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
      at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
      at java.lang.Thread.run(Unknown Source)
  [ERROR] 500 - POST /atlas_emergency_status_page/DBService (127.0.0.1) 57 bytes
     Request headers
        Host: 127.0.0.1:8888
        Connection: keep-alive
        Content-Length: 162
        X-GWT-Module-Base: http://127.0.0.1:8888/atlas_emergency_status_page/
        X-GWT-Permutation: BE75887428AD071A73976B7011B26FBF
        Origin: http://127.0.0.1:8888
        User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36
        Content-Type: text/x-gwt-rpc; charset=UTF-8
        Accept: */*
        Referer: http://127.0.0.1:8888/ATLAS_Emergency_Status_Page.html
        Accept-Encoding: gzip, deflate
        Accept-Language: en-US,en;q=0.8,fr-CH;q=0.6,fr;q=0.4,ka;q=0.2,ru;q=0.2
     Response headers
        Content-Type: text/plain
  </code></pre>
  
  <p>what might be causing this?</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>Here is my <strong>web.xml</strong>:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns="http://java.sun.com/xml/ns/javaee"
           xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
           http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"&gt;
  
    &lt;!-- Servlets --&gt;
    &lt;servlet&gt;
      &lt;servlet-name&gt;greetServlet&lt;/servlet-name&gt;
      &lt;servlet-class&gt;ch.cern.atlas.emergency.status.server.GreetingServiceImpl&lt;/servlet-class&gt;
    &lt;/servlet&gt;
  
    &lt;servlet-mapping&gt;
      &lt;servlet-name&gt;greetServlet&lt;/servlet-name&gt;
      &lt;url-pattern&gt;/atlas_emergency_status_page/greet&lt;/url-pattern&gt;
    &lt;/servlet-mapping&gt;
  
    &lt;!-- Default page to serve --&gt;
    &lt;welcome-file-list&gt;
      &lt;welcome-file&gt;ATLAS_Emergency_Status_Page.html&lt;/welcome-file&gt;
    &lt;/welcome-file-list&gt;
  
    &lt;!-- Servlets --&gt;
    &lt;servlet&gt;
      &lt;servlet-name&gt;LoginService&lt;/servlet-name&gt;
      &lt;servlet-class&gt;ch.cern.atlas.emergency.status.server.LoginServiceImpl&lt;/servlet-class&gt;
    &lt;/servlet&gt;
  
    &lt;servlet-mapping&gt;
      &lt;servlet-name&gt;LoginService&lt;/servlet-name&gt;
      &lt;url-pattern&gt;/atlas_emergency_status_page/LoginService&lt;/url-pattern&gt;
    &lt;/servlet-mapping&gt;
  
    &lt;servlet&gt;
      &lt;servlet-name&gt;DBService&lt;/servlet-name&gt;
      &lt;servlet-class&gt;ch.cern.atlas.emergency.status.server.DBServiceImpl&lt;/servlet-class&gt;
    &lt;/servlet&gt;
  
    &lt;servlet-mapping&gt;
      &lt;servlet-name&gt;DBService&lt;/servlet-name&gt;
      &lt;url-pattern&gt;/atlas_emergency_status_page/DBService&lt;/url-pattern&gt;
    &lt;/servlet-mapping&gt;
  
  &lt;/web-app&gt;
  </code></pre>