IV02865: CAN NOT ATTACH MORE THAN 1 REMOTE DEBUGGER

APAR status

• Closed as program error.

Error description

• Error Message: 1. Start a java process with jdwp and server mode
  on, such as "java
  -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=12
  7.0.0.1:8008 TestClass"
  2. Use jdb to attach the target VM, such as "jdb -attach
  127.0.0.1:8008"
  3. repeat step 1 and it will says fail to bind
  But the same does not happen on IBM JDK 5
  
  The above test was conducted with the SR mentioned by the
  customer. JDK
  1.6 SR9 FP1
  .
  Stack Trace: N/A
  .
  The same test was run with IBM Java 1.5 (build
  pxi32devifx-20100127 (SR11 FP1 )). User was able to attach a
  remote
  debugger to each new process started.
  

Local fix

• Use different port for each connection.
  

Problem summary

• The problem is caused when the target VM establish a connection
  with debugger and then another target VM wants to listen on the
  same port and it fails to bind on that port.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR10
  6.0.1 SR1
  .
  According to the behavior of IBM JDK 5, the following change is
  made. When target VM establish a connection with debugger, it
  stops listening on the port, so that others can bind on this
  port. And when the debugger quits and closes the connection, the
  target VM will try to re-listen on this port to serve other
  debuggers. If the listen action fails, the target VM will do
  nothing more until the program running on the target VM exit.
  .
  To obtain the fix:
  Install build 20110709 or later
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R600 PSY

     UP