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Old 08-25-2004, 04:03 AM   #1 (permalink)
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Default global try/catch

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Hi,

I am trying to catch uncaught errors in my application with a global try/catch.
My problem is that, in my catch, I would like to display a message (something that could be like Microsoft's famous blue screen) with that code :
public static void main(String[] args) {

try{
Youpi theApp=new Youpi ();
theApp.enterEventDispatcher();
}catch(Exception e){

}
Application.getApplication().invokeLater(new Runnable() {

public void run() {
Dialog.alert("Your application has crashed down");
UiApplication.getUiApplication().updateDisplay();
System.exit(-1);
}
});


}
Nothing happens, the message does not display and the application does not exit
anyone could help me please?
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Old 08-25-2004, 01:38 PM   #2 (permalink)
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Although I am familiar with programming many other platforms (I have been programming for 19 years), I haven't made software for BlackBerry yet, but let me try to provide a few leads:

(1) Possibility One.
From certain platforms I believe you cannot display messages during certain kinds exceptions, especially operating-system-related exceptions. To solve this, you may have to set a variable flag that another handler checks and display the message in there instead. This may not apply to Blackberry, but I should mention this.

(2) Possibility Two
Another thing is that your exception handler is not even being executed at all. You will need to debug this. (Exception debugging is a toughie, inconsistent behaviour on different platforms too)

(3) Possibility Three
Displaying not updating before the crash, or that your alert message is non-blocking (i.e. does not pause all application threads when the message is displayed -- your message could be pre-empted if your application exits before the 'OK' is clicked on). I am not sure if that particular alert message is blocking (as in fully application modal, in Windows-ese programming terminology)

(4) Possibility Four
Look for ther source-code-available applications like those I listed, and study how this particular exception handling is done. Reverse engineer the technique into your software if allowed to do so. (i.e. open source applications are a good learning tool -- see the other links in this forum -- though you will have to rewrite the code on your own for proprietary use)
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