Subj : Re: Rhino: Accessing embedded exception in JavaException
To   : netscape.public.mozilla.jseng
From : lgardner
Date : Tue Apr 20 2004 11:12 pm

Igor,
thanks for your reply; I should have included that I'm already using
Rhino 1.5R5.
Unfortunately your solution does not seem to work for me. 
This is the output:

try {
   callJavaFunctionThrowingFooException();
} catch (ex) {
   print(ex);     // prints: JavaException: FooException:
   print(ex.getWrappedException());    // undefined error
}

If I analyse the exception class further it seems to be of the type
org.mozilla.javascript.NativeError.

Where am I going wrong? BTW, FooException is a RuntimeException, could
that be the reason? If yes, is there any way I can still get at the
original exception?

thanks,
Lewis

Igor Bukanov <igor@fastmail.fm> wrote in message news:<4084EEC6.6000206@fastmail.fm>...
> Lewis Gardner wrote:
> > Hi,
> > when I call a Java method via LiveConnect (Rhino) and the method
> > throws an exception the type of the exception thrown in
> > "JavaException". Is there any way I can access the original exception,
> > the one actually thrown by the Java method?
> 
> I would suggest to upgrade to Rhino 1.5R5 which consistently rethrows 
> exceptions from Java methods as org.mozilla.javascript.WrappedException 
> where the method getWrappedException() returns the original exception 
> object.
> 
> Prior 1.5R5 Rhino could throw either 
> org.mozilla.javascript.WrappedException or 
> org.mozilla.javascript.JavaScriptException and in the later case to get 
> the original object you have to call getValue() method there, check if 
> it is an instance of Throwable and in addition if that was an instance 
> of WrappedException, then call getWrappedException() to get the real 
> exception source.
> 
> In Rhino 1.5R5 JavaScriptException represents only exceptions thrown by 
> scripts with JavaScript "throw" statement.
> 
> Regards, Igor

.