This is a libthread issue. When the customer switched to the alternative 
libthread and using jdk1.3.1_02 the hang does not appear. Also using their 
original configuration, which was jdk1.3.1_01 with the default libthread for 
Solaris 8 (T1), and using -XX:+UseBoundThreads the hang cannot be reproduced.

The customer has accepted and feels more comfortable with the boundthreads 
workaround and is unwilling to persue this further.

 xxxxx@xxxxx  2001-12-17
Servlet engine using Oracle jdbc causes JVM 1.3.1 to hang on heavy load.
truss, dbx and pstack during the hang show thread deadlocks. It is not 
possible to make a thread dump.

Information provided in attachment :

- pstack output during hang
- truss 1min before and after the hang
- showrev -p
- prtdiag of the system
- dbx stacks of several threads

Other information available :
- gcore of the jvm during the hang.

1) -XX:+UseBoundThreads
or
2) alternative libthread: export LD_LIBRARY_PATH=/usr/lib/lwp
   jdk1.3.1_02 
   -XX:+OverrideDefaultLibthread

JPSE

This is a libthread issue. When the customer switched to the alternative 
libthread and using jdk1.3.1_02 the hang does not appear. Also using their 
original configuration, which was jdk1.3.1_01 with the default libthread for 
Solaris 8 (T1), and using -XX:+UseBoundThreads the hang cannot be reproduced.

The customer has accepted and feels more comfortable with the boundthreads 
workaround and is unwilling to persue this further.

 xxxxx@xxxxx  2001-12-17