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copied!<p><strong>Client:</strong> All Callbacks extend a Abstract Callback where you implement the onFailur()</p> <pre><code>public abstract class AbstrCallback<T> implements AsyncCallback<T> { @Override public void onFailure(Throwable caught) { //SessionData Expired Redirect if (caught.getMessage().equals("500 " + YourConfig.ERROR_MESSAGE_NOT_LOGGED_IN)) { Window.Location.assign(ConfigStatic.LOGIN_PAGE); } // else{}: Other Error, if you want you could log it on the client } } </code></pre> <p><strong>Server:</strong> All your ServiceImplementations extend AbstractServicesImpl where you have access to your SessionData. Override onBeforeRequestDeserialized(String serializedRequest) and check the SessionData there. If the SessionData has expire then write a spacific error message to the client. This error message is getting checkt in your AbstrCallback and redirect to the Login Page.</p> <pre><code>public abstract class AbstractServicesImpl extends RemoteServiceServlet { protected ServerSessionData sessionData; @Override protected void onBeforeRequestDeserialized(String serializedRequest) { sessionData = getYourSessionDataHere() if (this.sessionData == null){ // Write error to the client, just copy paste this.getThreadLocalResponse().reset(); ServletContext servletContext = this.getServletContext(); HttpServletResponse response = this.getThreadLocalResponse(); try { response.setContentType("text/plain"); response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); try { response.getOutputStream().write( ConfigStatic.ERROR_MESSAGE_NOT_LOGGED_IN.getBytes("UTF-8")); response.flushBuffer(); } catch (IllegalStateException e) { // Handle the (unexpected) case where getWriter() was previously used response.getWriter().write(YourConfig.ERROR_MESSAGE_NOT_LOGGED_IN); response.flushBuffer(); } } catch (IOException ex) { servletContext.log( "respondWithUnexpectedFailure failed while sending the previous failure to the client", ex); } //Throw Exception to stop the execution of the Servlet throw new NullPointerException(); } } } </code></pre> <p>In Addition you can also Override doUnexpectedFailure(Throwable t) to avoid logging the thrown NullPointerException.</p> <pre><code>@Override protected void doUnexpectedFailure(Throwable t) { if (this.sessionData != null) { super.doUnexpectedFailure(t); } } </code></pre>

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