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gwt application stopped running suddenly

first of all I am sorry on my English.
I have a problem in my Gwt application.
I build Gwt application and I work on application every day
Yesterday I want to still work on my application but is stopped worked and i do not know why and I not get errors
The application compiled and I get the Url to run on browser
I copy the Url to my Firefox browser and not happened nothing.
I put break point in my entry point class and I see the application not arrived to entry point and I do not know why.
I try to open new project to check maybe the problem in eclipse or in Gwt plug in but the new project worked excellent so I understand the problem in specific this project.
I need help
thank you everyone

Okay i have 3 possible suspicions:
You updated your Application, but for some reason some JavaScript stayed inside the Firefox cache. Solution: Go to options and "Clean cache" and always try to press CTRL+F5 instead of just reloading, this will clean the current website's cache saved in your Browser.
Your HDD is full(less likely). You said you work everyday on the app. The caching in dev-mode is very VERY bad(for me it once contained 300GB of cached data). there is a folder called <win_user>/AppData/Local/Temp - delete everything inside if you find a lot of "gwt-<something>" files and check the folder's size. There is nothing valuable inside it(if you didn't place anything inside :D)
P.S. Turns out it was a Firefox Memory-leak that has been fixed in GWT 2.6.0 :)
Your Eclipse messed up some random stuff. As always - Project > Clean...
Then right click on app and let gwt recomile your app(if you have an ant file that uses the gwt-compiler, execute that)
I can't really think of anything else...
The only thing that could be is that YOU changed something, but you said you didn't so...
Hopefully it works,
Laurenz

Works fine in NetBeans, Have some errors when built

I am in a very very upset situation. My program worked 100% fine when it is in netbeans, but when I build it it has some issues. That is, in my program, there is an one interface and 10 implementation classes. Program calls correct correct implementation class based on how the user save the file (eg: if user save it as game.yellow, it will call "YellowImpl.java", if saved as game.red, then "RedImpl.java" likewise).
But when it is built, it is calling everything fine, instead YellowImpl!! Which means, if the user saves it as game.red, it will call "RedImpl" correctly and same to all other implementations instead YellowImpl. When the user save the file as game.yellow, the program do nothing!!! But this is not happening when it is inside the netbeans! I tried clean and build too, still not good! What is causing this ? Please help!
However, I am unable to provide the code, because it has lot of codings
PS: I am using some libs too

It's difficult to understand exactly what issue you are having with your explaination and no code. However I assume you are having issue with implementation naming conventions.
Perhaps the below link can help.
Java Interfaces/Implementation naming convention

I am agree with #Rhys: it is hard to understand what happens in your application. Just let me give you an advice: do not think (even for 1 second) that there is a bug in java compiler, JVM etc. It is definitely your bug.
How to find it? I suggest you to use remote debugging.
Run your application outside IDE (NetBeans in your case) with enabled remote debugger, connect to it with net beans and debug your application. I believe you will fined the problem within minutes.
How to enable remote debugging? Add the following long string to your java execution command line:
-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
If something happens in very beginning of your program execution use suspend=y.
Now connect to this application from NetBeans. It is simple, just configure it to port 8000 according to the configuration of your application.
That's it. Good luck.

Thanks a lot for the replies guys. However, I managed to find the issue. That was a simple, capital case!! I have a package called "kolor" and all the implementations are inside that. In my "YelloImpl" class, I have mentioned the package as "Kolor" (Note that "K" is capital). It was fine in netbeans, but outside it wasn't. After clearing this out, everything went fine. Thanks all for the replies again.

Java Code only working in debug mode

I have to make a game in Java for my computer science class. Since I have already wrote a game in Java in my spare time, I decided that I would reuse some of the code. However, after importing my old code I found that it only worked in debug mode. Running it normally would not make the program crash, but many of the in-game features were not working. I think I might have seen a class not found exception once when in debug mode, but it did not show up again. What could possibly be causing this problem? I have already tried re-importing the files. Feel free to ask for any additional information.

For any non-standard class, remove the import statements. Then let the IDE make suggestions. Make sure the suggestions make sense.
When you say "debug mode", do you mean running under the debugger in the IDE, or do you mean when you have logging enabled, or when you insert 'System.out.println' statements?

Hard to say with this amount of info. Maybe you need to clean out the generated class files so that a clean build is made. If it's running on a server, maybe you need to delete and recreate it on the server.

Java code in Netbeans IDE: Code executed is the older one! even when I make changes in the code

I am building an application in Java using Netbeans IDE. I am trying to debug some errors in my code. But even when I modify messages passed in the log statements, I do not see a corresponding change in the logged messages. This implies that when execute the code, it probably runs an older version of code & prints the old version of log messages as well.
What is the cause of this error ? & how should I rectify this ?
Thanks for helping..

I had that same problem...closing and reopening netbeans fixed it for me...

By saving the code. I assume, you are have compile-on-save enabled. If not then you have to build it before running it.
Yes you need to enable build-on-save, otherwise GlassFish wouldn't be able to show you the changes, because the new changes have never been deployed. Sometimes, deploying on save bothers a lot. So, what I do is, I don't enable build-on-save and work with tests and thereby run my tests to see the result of the change. When everything seems fine, then I build the app and deploy it on the server for further verifications.

Compile on save must be set.
See the properties of your project.
(Right click, select properties, then select compile).
Another possibility is that you have to redeploy
your project. In such a case I would recommend to
take a look at jRebel.

Mirth Running Old JAR File Code

This is really driving me crazy. No matter what I do, it seems that Mirth (1.8.2) is running an older version of my JAR file; I know because of various signs, like:
I can't call any functions
Information logged is not showing up in the logs
Changed log messages are not changed in the log files
Files that were once created and written to in code, but no longer touched by code, are still being created and written
I've tried everything I can think of to make this work. It was working at one point, but now it seems like it's no longer being updated. My process to integrate my changes into Mirth are:
Run an ant script to build the JAR file
Copy the JAR file to \lib\custom
Restart the Mirth service (via Mirth administrator)
I've tried restarting (Mirth service via Services, Java, computer) -- to no avail. I know my JAR file is correct, because I've decompiled it (to make sure it has the latest code) and hashed it (to compare to the hash of the ant-built JAR) -- it is correct and the code is there; it's just not being run.
I'm at wit's end; this occurs infrequently but completely blocks me from developing.
Edit: I also know that my code is correct, because when I run unit tests, it generates the right files and calls the right functions and logs the right information. Only Mirth seems to "not get it."
And my classes are very simple; simple one-argument constructors and a few public methods that return various data. Nothing complex, no nested classes/JARs/dependencies.
Edit: I even deleted my custom JAR file and restarted Mirth, and it's still running my code. Awesome :/ I've added a bounty for this question. I suspect the JAR is cached somewhere (even though they deny it on the Mirth forums) and that cache needs to be cleaned out somehow (although why restarting the Mirth service and my PC doesn't do it is beyond me).
I've also killed all instances of Java (and rebooted my computer), so that makes it highly unlikely that the JVM is caching the JAR somewhere.
I tried reinstalling Mirth. For some reason, it had my custom channel when I booted the administrator for the first time; and infuriatingly, it's still running the old JAR, even though I've updated it with the new one in lib\custom.

I ended up solving this with a combination of actions:
Uninstalling Mirth and Java, and then reinstalling.
I also removed all Java installations except one (one JDK and one JRE).
I stopped Mirth when you copying my JAR. Stop Mirth, copy, and restart; don't try to copy on a live installation. It may or may not pick up your updated JAR depending on if it's loaded into a JVM or not.
This combination of steps seemed to work. Prior to this, I had 3-4 JREs installed (and two JDKs) and I was copying (successfully, according to Windows 7) the JARs while Mirth was running. It's working now!

Mirth is a J2EE application running on a plain old JVM; you have options for debugging it.
You could follow the instructions here for running Mirth Connect via Eclipse. You could then see the JVM classpath, you could set breakpoints and use the debugger.
Mirth is based on the Mule ESB. Mule has its own way of class-loading. You could research it.
If Mirth is really using an old version of your JAR, maybe it's got a cached version around somewhere. Or maybe you made some configuration changes you've forgotten about - perhaps you added a new directory for jars. (Not sure how you do that.)
Mule pays attention to an environment variable named MULE_LIB; maybe that's relevant.
It looks like Mirth Connect 1.8 and Mirth Connect 2.0 have different places for jars (lib/custom and custom-lib, respectively). Which version are you using?