IJ28836: Z/OS SPECIFIC C FUNCTION SEND_FILE IS CHANGING THE FILE POINTER POSITION

APAR status

• Closed as program error.

Error description

• Error Message: No errors reported. Data corruption Issue seen.
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• This issue happens on Java8 and Java7 for z/OS. The z/OS
  specific C function send_file is changing the file pointer
  position though as per the API documentation
  (http://w3.hursley.ibm.com/java/docs/java7/api/java/nio/channels
  /FileChannel.html#transferTo) the "Bytes may be read or written
  at an absolute position in a file in a way that does not affect
  the channel's current position."
  

Problem conclusion

• Code for resetting the file position is already present but was
  not getting executed as the method
  transferToDirectlyNeedsPositionLock of FileDispatcherImpl.java,
  returned false for all platforms. The method
  transferToDirectlyNeedsPositionLock was modified to return true
  in case of z/OS.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP20  (8.0.6.20)
     7    SR10 FP75 (7.0.10.75)
     7 R1 SR4 FP75  (7.1.4.75)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

• R800 PSY

     UP

• R700 PSY

     UP