IV55319: FILE OPEN ERRORS WITH JAVACOMM

APAR status

• Closed as program error.

Error description

• Error Message: In a javacomm application open() and sem_open()
  calls, on certain internal files, keep failing due lack of
  permissions.
  .
  Stack Trace: N/A
  .
  Continuous open() failures may lead to a high CPU situation.
  

Local fix

• Manually change permissions of all the files created by javacomm
  to 0666:
  > chmod 666 /dev/shm/sem.javax.comm*
  > chmod 666 /tmp/javax.comm*
  

Problem summary

• Javacomm creates semaphore and temporary files to synchronize
  access to shared resources. It restricts the write access to
  these files, to the owner (permissions 0644). Javacomm
  applications spawned by other users cannot write to these files,
  leading to a starvation condition.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     6    SR16      (6.0.16.0)
     7    SR7       (7.0.7.0)
  .
  The files created to synchronize access to shared resources need
  to have a universal read/write access. Their permissions are
  hence changed to 0666.
  

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

• R700 PSY

     UP