I am writing a C++ command line program (using CodeWarrior and the
Mac OS X PowerPC Mach-O linker to create an executable) in which I
want to invoke a Java VM.
The class I'm trying to use indirectly uses AWT. It executes as
expected if I run it using "java -cp ...", but if I run it from my
program I get the following error:
2005-03-20 22:47:18.355 mytest[1041] Apple AWT Java VM was loaded on
first thread -- can't start AWT.
Exception in thread "main" java.lang.InternalError: Can't start the
AWT because Java was started on the first thread. Make sure
StartOnFirstThread is not specified in your application's Info.plist
or on the command line
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1503)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
at java.lang.System.loadLibrary(System.java:834)
at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.loadLibraries(Toolkit.java:1437)
at java.awt.Toolkit.<clinit>(Toolkit.java:1458)
at quicktime.QTSession.<clinit>(QTSession.java:77)
at squarebox.mytest.Main.main(Main.java:72)
I tried restructuring my code so it fires off a new thread instead of
initialising the AWT Toolkit from my main thread. Sure enough, the
error goes away, but instead the application just hangs, with the
thread dump below. Again, the problem seems to lie in
Toolkit.loadLibraries().
Any ideas?
-Rolf
Full thread dump Java HotSpot(TM) Client VM (1.4.2-38 mixed mode):
"Runner" prio=5 tid=0x0110b530 nid=0x282ac00 runnable [f0405000..f0407b20]
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
- locked <0x65000228> (a java.util.Vector)
- locked <0x65000278> (a java.util.Vector)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1503)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
- locked <0x65012160> (a java.lang.Runtime)
at java.lang.System.loadLibrary(System.java:834)
at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.loadLibraries(Toolkit.java:1437)
at java.awt.Toolkit.<clinit>(Toolkit.java:1458)
at quicktime.QTSession.<clinit>(QTSession.java:77)
at squarebox.mytest.Main._main(Main.java:97)
at squarebox.mytest.Main.access$0(Main.java:58)
at squarebox.mytest.Main$1.run(Main.java:52)
"Signal Dispatcher" daemon prio=10 tid=0x01107f30 nid=0x2812600
waiting on condition [0..0]
"Finalizer" daemon prio=8 tid=0x011069d0 nid=0x280d800 in
Object.wait() [f0203000..f0203b20]
at java.lang.Object.wait(Native Method)
- waiting on <0x65000448> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
- locked <0x65000448> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x011066a0 nid=0x2802200 in
Object.wait() [f0182000..f0182b20]
at java.lang.Object.wait(Native Method)
- waiting on <0x65000338> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:429)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:115)
- locked <0x65000338> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=0x01100c50 nid=0xa000a1ec waiting on condition
[bffff000..bffff938]
at java.lang.Thread.sleep(Native Method)
at squarebox.mytest.Main.main(Main.java:55)
"VM Periodic Task Thread" prio=10 tid=0x01107e70 nid=0x2812200
waiting on condition
"Exception Catcher Thread" prio=10 tid=0x01100db0 nid=0x2801200 runnable
--
Rolf Howarth, Square Box Systems Ltd, Stratford-upon-Avon UK.
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