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Re: mysterious Java application crash

Hi everybody,

Thank you all for your hints, I finally found a solution to my problem. It was discussed just over a month ago on this very list, and I somehow missed to pick it up:

http://lists.apple.com/archives/Java-dev/2007/Feb/msg00294.html

I think I've been going the same way as the Joshua, picking up some sample code how to remove the drop shadow from AWT Window objects and the running into random crashes eventually.

best regards,

Florian

Doug Zwick wrote: 
Florian Bruckner wrote:

The application is plain Swing, there is only a single snippet
of code that is using Cocoa API


So, from my point of view, this should not be able to cause the "garbage
collected java ref", as we work with hard references from a Java point
of view and keep references to the cocoa objects in code, but I may very
well be wrong, as I do not have experience with this API.

The Cocoa-Java classes are not intended for use in Swing programs -- this is all the com.apple.cocoa... packages. They are only safe to use in pure Cocoa-Java apps. Many of the methods are only safe to call from the AppKit thread -- which is inaccessible to a pure Swing/Java app. The symptoms of misusing these methods are deadlocks and crashes. These packages are all deprecated by Apple, and will be removed in some future release (or so they tell us).

Rework the Cocoa-Java code to use JNI and Objective-C, and use NSObject performSelectorOnMainThread to get onto the AppKit thread. Since you're already running native code, you might as well use JAWT to get at the native Cocoa objects, and perform your operations there.
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 >Re: mysterious Java application crash (From: Doug Zwick <email@hidden>)



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