title: Servlet should accept POST and GET
body: <p>I try to implement a servlet which should be called either through POST or GET.</p>
  
  <p>So I wrote something like this</p>
  
  <pre><code> @Override
   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doGet(req, resp);
   }
  
   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    // .. do stuff
  
    // forward to welcome page
    this.getServletContext().getRequestDispatcher("/guestbook.jsp").forward(req, resp);
    return;
   }
  </code></pre>
  
  <p>But/or because of the forward at the end I get an IllegalStateException, which is only a warning but still. What should I do differently?</p>
  
  <p>Thanks,<br />
  -lony</p>
  
  <p>Edit: Wanted Stacktrace</p>
  
  <pre><code>2012-05-26 18:02:16.422:WARN::/wsc/guestbook
  java.lang.IllegalStateException: Committed
      at org.eclipse.jetty.server.Response.resetBuffer(Response.java:1056)
      at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:216)
      at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:115)
      at de.tum.in.dss.GuestbookController.doGet(GuestbookController.java:135)
      at de.tum.in.dss.GuestbookController.doPost(GuestbookController.java:37)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
      at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352)
      at de.tum.in.dss.XSSFilter.doFilter(XSSFilter.java:76)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
      at de.tum.in.dss.AccessFilter.doFilter(AccessFilter.java:55)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:476)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
      at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:517)
      at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225)
      at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:937)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:871)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
      at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247)
      at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
      at org.eclipse.jetty.server.Server.handle(Server.java:346)
      at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589)
      at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1065)
      at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:823)
      at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:220)
      at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)
      at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:535)
      at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40)
      at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529)
      at java.lang.Thread.run(Thread.java:722)
  </code></pre>