site_archiver@lists.apple.com Delivered-To: bluetooth-dev@lists.apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists.a... I am trying to add Bluetooth RFCOMM connectivity to an existing Java application. The Java app uses AWT for the GUI and a jnilib native library for traditional serial port access. I have based my code on Apple's JNI Example which calls a dylib from a JNI library. ( http://developer.apple.com/samplecode/JNISample/JNISample.html ) I have gotten as far as putting up the Bluetooth device selector controller but I have quickly run into threading problems. When I click on the "Search" button of the dialog, I get a "<NSObjectInaccessibleException> NSDistantObject access attempted from another thread" I have been cautioned about the threading limitations of Bluetooth. I understand that Bluetooth must run in a single thread, and that the UI must run in the main thread. What I don't understand is *how* to make my Bluetooth code run in the main thread. Since the BT code is in a dylib called from a jnilib I don't even know if it is possible. In an earlier stab at a solution, I tried using the Java Objective-C bridge, basing my code on the sample provided at http://www.montagetech.com/developer_bridget.html In that case, I also got a threading error - "Apple AWT Java VM was loaded on first thread -- can't start AWT." I gave up that approach because I was already unhappy with the workarounds required to get Xcode over the bridge. Also, Apple has a Q&A cautioning against mixing AWT and Cocoa Java which recommends using JNI. ( http://developer.apple.com/qa/qa2001/qa1342.html ) But if the bridge is ultimately more promising than JNI, I'll pursue it, assuming that someone can tell me how to avoid the AWT error I'm faced with now. I'm hoping there's at least one Java AWT/Bluetooth/Java Objective-C bridge/threading expert out there who can solve problems like this in his sleep. Or at least, someone who knows more about this than me, which is sure to be a significantly larger group. This email sent to site_archiver@lists.apple.com