TTY: jdb does not set valid thread group as default

Name: dkR10014 Date: 11/05/2001


 The jdb from jdk1.4.0 fails to pass the test against "threadgroup" command.
The test works as follows.

The number of threads are created in two named ThreadGroup(s) in the
debugged test application. The jdb stops the debugeed application at
given breakpoint and then lists all existing thread groups upon
"threadgroups" command. Then two "threadgroup <thread_group_name>"
commands try to set up application's thread groups as default.
But the jdb message:
  "myGroup-..." is not a valid threadgroup name.
is received.
  
This failure is observed on all platforms - Solaris, Linux, Windows.
The jdb from jdk1.4.0-beta3-b84 build was tested.

Steps to reproduce the bug:
1. cd /net/sqesvr.sfbay/export/vsn/GammaBase/Bugs/{this bug ID}
2. sh doit.sh {JAVA_HOME} {PERL5_PATH}

where JAVA_HOME is for jdk1.4.0 and PERL5_PATH is path to perl5 binary.

This bug affects the following testbase_nsk test:
   nsk/jdb/threadgroup/threadgroup001
    
======================================================
Below is the jdb input command scenario:

stop at ThreadGroupTest:116
run ThreadGroupTest
threadgroups
threadgroup myGroup-0
threads
threadgroup myGroup-1
threads
cont

======================================================
Below is the jdb output redirected to X.debug.out file.
It shows that there is a tail of null symbols after name of thread group
in a "threadgroups" and "threads" commands' output.
 
Initializing jdb ...
> Deferring breakpoint ThreadGroupTest:116.
It will be set after the class is loaded.
> run ThreadGroupTest
>
VM Started: Set deferred breakpoint ThreadGroupTest:116

Breakpoint hit: "thread=main", ThreadGroupTest.main(), line=116 bci=249
116 int i = 0; // a dummy statement. acts as a breakpoint.

main[1] 1. (java.lang.ThreadGroup)0x12d system
2. (java.lang.ThreadGroup)0x12e main
3. (java.lang.ThreadGroup)0x130
myGroup-0<null><null><null><null><null><null><null>
4. (java.lang.ThreadGroup)0x131
myGroup-1<null><null><null><null><null><null><null>
main[1] "myGroup-0" is not a valid threadgroup name.
main[1] Group system:
  (java.lang.ref.Reference$ReferenceHandler)0xf5 Reference Handler cond. waiting
  (java.lang.ref.Finalizer$FinalizerThread)0xf4 Finalizer cond. waiting
  (java.lang.Thread)0xf2 Signal Dispatcher running
  (java.lang.Thread)0xf3 CompileThread0 cond. waiting
Group main:
  (java.lang.Thread)0x1 main running (at
breakpoint)
  (java.util.logging.LogManager$Cleaner)0x12f Thread-0 unknown
Group myGroup-0<null><null><null><null><null><null><null>:
  (t)0x12c myThread-0 cond. waiting
  (t)0x132 myThread-1 running
  (t)0x133 myThread-2 running
  (t)0x134 myThread-3 running
  (t)0x135 myThread-4 running
Group myGroup-1<null><null><null><null><null><null><null>:
  (t)0x136 myThread-5 running
  (t)0x137 myThread-6 running
  (t)0x138 myThread-7 running
  (t)0x139 myThread-8 running
  (t)0x13a myThread-9 running
main[1] "myGroup-1" is not a valid threadgroup name.
main[1] Group system:
  (java.lang.ref.Reference$ReferenceHandler)0xf5 Reference Handler cond. waiting
  (java.lang.ref.Finalizer$FinalizerThread)0xf4 Finalizer cond. waiting
  (java.lang.Thread)0xf2 Signal Dispatcher running
  (java.lang.Thread)0xf3 CompileThread0 cond. waiting
Group main:
  (java.lang.Thread)0x1 main running (at
breakpoint)
  (java.util.logging.LogManager$Cleaner)0x12f Thread-0 unknown
Group myGroup-0<null><null><null><null><null><null><null>:
  (t)0x12c myThread-0 cond. waiting
  (t)0x132 myThread-1 running
  (t)0x133 myThread-2 running
  (t)0x134 myThread-3 running
  (t)0x135 myThread-4 running
Group myGroup-1<null><null><null><null><null><null><null>:
  (t)0x136 myThread-5 running
  (t)0x137 myThread-6 running
  (t)0x138 myThread-7 running
  (t)0x139 myThread-8 running
  (t)0x13a myThread-9 running
main[1] > myThread-3 returns 10000
myThread-1 returns 10000
myThread-2 returns 10000
myThread-0 returns 10000
myThread-4 returns 10000
myThread-5 returns 10000
myThread-6 returns 10000
myThread-7 returns 10000
myThread-8 returns 10000
myThread-9 returns 10000

The application exited

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Name: dkR10014 Date: 01/13/2003


This bug also affects the following testbase_nsk test:
   nsk/jdb/threadgroup/threadgroup002


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