I have an applet which reliably crashes the VM during garbage
collection
(at least, I presume it is during garbage collection because of the
following message). For example:
objc: FREED(id): message finish sent to freed object=0x3ad3c0
Does anyone have any recommendations for debugging this (obviously
I am
in search of a workaround that will avoid the VM crashing)?
This error message is coming from the Objective-C runtime, complaining
about reuse of an already-deallocated Objective-C object.
The fault is likely to be in Apple's AWT/Swing implementation, which
is Objective-C based. Alternatively, if you have JNI code that
manipulates Objective-C objects directly, it might be your fault.
First, you should try enabling NSZombie, which is an Objective-C
debugging mechanism. A good description is
http://www.cocoadev.com/index.pl?DebuggingAutorelease
(Since your code is an applet, you should run Safari
or appletviewer with those settings.)
Most likely, the bad object and allocation backtrace will be from
Apple's
AWT/Swing code. In that case, you should file a bug report with
Apple, and
include the NSZombie log, any crash logs, and the applet itself or some
test case derived from it.
--
Greg Parker email@hidden Runtime Wrangler
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