I've run a FFJ vith J2SDK1.4.0_b91 and the JVM crashes.

***
Unexpected Signal : 10 occurred at PC=0xFE1DB114
Function=JVM_GetCPFieldClassNameUTF+0x2DF8
Library=/space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/client/libjvm.so


Dynamic libraries:
0x10000 /space/j2sdk/j2sdk1.4.0_b91/bin/java
0xff360000 /usr/lib/libthread.so.1
0xff3a0000 /usr/lib/libdl.so.1
0xff280000 /usr/lib/libc.so.1
0xff270000 /usr/platform/SUNW,Ultra-5_10/lib/libc_psr.so.1
0xfe000000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/client/libjvm.so
0xff220000 /usr/lib/libCrun.so.1
0xff200000 /usr/lib/libsocket.so.1
0xff100000 /usr/lib/libnsl.so.1
0xff1d0000 /usr/lib/libm.so.1
0xff250000 /usr/lib/libw.so.1
0xff0e0000 /usr/lib/libmp.so.2
0xff0b0000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/native_threads/libhpi.so
0xff080000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libverify.so
0xff040000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libjava.so
0xff020000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libzip.so
0xef100000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libawt.so
0xeeb80000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libmlib_image.so
0xeff90000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/motif21/libmawt.so
0xee900000 /usr/dt/lib/libXm.so.4
0xef590000 /usr/openwin/lib/libXt.so.4
0xfa030000 /usr/openwin/lib/libXext.so.0
0xfa010000 /usr/openwin/lib/libXtst.so.1
0xee800000 /usr/openwin/lib/libX11.so.4
0xef1a0000 /usr/openwin/lib/libdps.so.5
0xefee0000 /usr/openwin/lib/libSM.so.6
0xefeb0000 /usr/openwin/lib/libICE.so.6
0xef4d0000 /usr/openwin/lib/libdga.so.1
0xee700000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libfontmanager.so
0xef4b0000 /usr/lib//liblayout.so
0xef2e0000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libsunwjdga.so
0xeeb50000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libjdgaSUNWffb.so
0xe7350000 /space/j2sdk/j2sdk1.4.0_b91/jre/lib/sparc/libnet.so

Local Time = Mon Jan 14 13:20:20 2002
Elapsed Time = 652
#
# HotSpot Virtual Machine Error : 10
# Error ID : 4F530E43505002D3 01
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Client VM (1.4.0-rc-b91 mixed mode)
#
# An error report file has been saved as hs_err_pid12550.log.
# Please refer to the file for further information.
#
Abort - core dumped
***

This happend during dynamic uninstalation of modules.