Re: The GWT application hangs on the loading screen

Hi Jeff, all,
your advice was very helpful to me, thanks a lot.

I put an alert message at the first line of your onModuleLoad method.

I put 3 more alert message in the entrypoint classes defined within the 3 gwt.xml files. I did this work first locally, where the project goes up without problems and then I deployed the war on the cloud.

Locally the 3 warning messages inform me that the 3 entrypoint classes are called. But this does not happen in the distributed application. Only the MyWorkspace class containing the  onModuleLoad()  method is called and then it enters a sort of loop, always loading the same class and never the 3 entrypoint classes.
Please, do you know why this happens?

This is all happening following an upgrade from GWT 1.5 to GWT 2.7.0, with jdk 1.8.

Thanks in advance,

Antonio

Il giorno mercoledì 17 gennaio 2024 alle 18:28:04 UTC+1 Jeff Hill ha scritto:

There might be an error in the actual code of the app (exception or other).

I suggest you try some primitive debugging with a Window.alert message as the first line of your onModuleLoad method.

ie...

 @Override
public void onModuleLoad() {

Window.alert("App is starting");

On Wednesday, January 17, 2024 at 10:16:54 AM UTC-7 Antonio Capone wrote:

 Hi Frank, thanks for the support.
No errors appear in the application logs of the application nor in the Develop Tool. The nocache.js file is successfully loaded. What else could it be?

Regrds

Il giorno lunedì 15 gennaio 2024 alle 15:15:56 UTC+1 Frank Hossfeld ha scritto:

Did you check in the Developer Tools ->. Network if the nochache.js gets loaded?

Antonio Capone schrieb am Montag, 15. Januar 2024 um 09:53:58 UTC+1:

Hello everyone and thanks for the advice you are giving me.
The nocache.js file is regularly generated and loaded. I don't think I have a problem with the URI because I can also see the home page grid but nothing more. No errors appear in the developer tool. Note that I upgraded from GWT 2.1 to GWT 2.7 and before that I had no problems.
Can you give me some other suggestions?
Thanks again.

Il giorno domenica 14 gennaio 2024 alle 05:39:07 UTC+1 Craig Mitchell ha scritto:

I use a servlet filter to tell the browser not to cache the nocache files:

public class ServletFilter implements Filter {
  private static final String NO_CACHE = ".nocache.js";

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    String requestURI = ((HttpServletRequest)request).getRequestURI();

    // Don't cache the nocache
    if (requestURI.endsWith(NO_CACHE)) {
      setNoCache((HttpServletResponse)response);
    }
    chain.doFilter(request, response);
  }

  private void setNoCache(HttpServletResponse httpResponse) {
    Date now = new Date();
    httpResponse.setDateHeader("Date", now.getTime());
    httpResponse.setDateHeader("Expires", now.getTime() - 86400000L);
    httpResponse.setHeader("Pragma", "no-cache");
    httpResponse.setHeader("cache-control", "public, max-age=0, must-revalidate");
  }
}

On Saturday 13 January 2024 at 2:54:08 am UTC+11 Jeff Hill wrote:

There may have been some Chrome updates in the last few months; occasionally, I must hard refresh to get the latest code from nocache.js.  (That did not happen in  years past)

Anyway, I always check in Developer Tools in Chrome to make sure there are no errors in the "Console" and all the necessary files are being loaded in the "Network" tab.

On Thursday, January 11, 2024 at 6:42:14 AM UTC-7 Frank Hossfeld wrote:

Check if the nochache.js gets loaded at a applicaiton staert or if it got a 404. In this case something with the URI is not ok.

Antonio Capone schrieb am Donnerstag, 11. Januar 2024 um 10:56:55 UTC+1:

Hi all. I deployed an app using GWT on Cloud. It's deployed and working, but when you log in, the browser window just says "Loading" and seems to hang indefinitely. Works fine locally in Eclipse.

Has this ever happened to you? Is there anyone who can help me understand why this happens?
Many thanks

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