C++ application, that uses Java, gives the following error message,
when trying to run the application on JRE6:

Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: sun.awt.motif.AWTLockAccess.awtLock()V
        at sun.awt.motif.AWTLockAccess.awtLock(Native Method)
        at [ ... ]

and throws an hs_err_pid.log file:

% more hs_err_pid20710.log
#
# An unexpected error has been detected by Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xff2565a4, pid=20710, tid=22
#
# Java VM: Java HotSpot(TM) Server VM (11.3-b02 mixed mode solaris-sparc)
# Problematic frame:
# C [libc.so.1+0x565a4]
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

--------------- T H R E A D ---------------

Current thread (0x0055a800): JavaThread "AWT-EventQueue-0" [_thread_in_native, id=22, stack(0xe3800000,0xe3880000)]

siginfo:si_signo=SIGSEGV:
%

On JRE 5.0 everything works fine.

This RFE suggests to revert things in future JREs, in order to enable the
application to work fine again.