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Re: Mixing Cocoa Java and Java AWT Q&A

you can mix native GUI element with java via
1. JAWT interfaces (fully documented and well supported)
2. CocoaComponent class (fully documented and well supported)
3.(?) it was suggestion on that list about changing peer for the AWT frame
but there wasn't definitive conclusion (AFAIK)


On Feb 27, 2004, at 12:01 AM, Greg Bolsinga wrote:

Hello-

The amount of Cocoa Java and Java AWT mixing suggested on this mailing list is interesting. The posts on this list are the only times I've personally heard of mixing these two technologies together.

It's good to know that this combination is working for some users, but the Apple and Sun suggested way of accessing platform specific native specialties from java is by using JNI. Accordingly, Apple has just created an official Technical Q&A about this matter. <http://developer.apple.com/qa/qa2001/qa1342.html>

When using JNI, the developer is made more aware of the issues involved with any platform specific issues. For example, while Java is thread crazy and fairly multiple thread aware, all of the rest of Mac OS X isn't always a good multi-threaded citizen without lots of preparation by the developer. When the developer is writing code with a native language while using the native API, hopefully they will be aware of all of the multiple threading issues involved.

For example, there are places in Cocoa Java that won't mix with Java AWT, such as when executing on the main AppKit thread is required. Cocoa's -performSelectorOnMainThread simply isn't accessible via Cocoa Java's NSObject (as it is with Obj-C). Java AWT by design doesn't allow any client java code to be executed on the AppKit main thread (perhaps modulo some bugs). So mixing the two technologies can have troubles, and isn't suggested.

Thanks!
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Dmitry Markman
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References: 
 >Mixing Cocoa Java and Java AWT Q&A (From: Greg Bolsinga <email@hidden>)



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