IJ47667: STDOUT/STDERR MESSAGES NOT CAPTURED TO TARGET FILE WHEN REDIRECTED BETWEEN A ZFS FILE AND AN MVS DATASET

APAR status

• Closed as program error.

Error description

• Error Message: Diagnostic messages from JVM or attached agents
  written to standard error were not captured in JES output.
  .
  Stack Trace: N/A
  .
  N/A
  

Local fix

• N/A
  

Problem summary

• On z/OS, the java/io/FileOutputStream implementation relies on
  the POSIX write() API, which uses file descriptors that can only
  target either MVS datasets or UNIX System Services (USS) zFS
  files, whichever is used first. If the application does a
  freopen() call to redirect stdout/stderr streams to the opposite
  file type, messages written to stdout/stderr may not be captured
  in the redirected file.
  

Problem conclusion

• A new Java property, com.ibm.writeToStandardOutputsUsingStreams,
  when set to true, will cause stdout/stderr messages to be
  written via file streams, which support redirection between MVS
  datasets and USS zFS files. Note, this alternate implementation
  changes the default buffering behaviour to line-buffering, and
  output may not be flushed in a timely fashion. This issue can be
  addressed by updating the buffering behaviour after freopen() to
  use no-buffering via a setbuf or setvbuf call.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     11              11.0.20.1
     17              17.0.7.0 (GA)
  IBM SDK, Java Technology Edition
      8    SR8 FP15  (8.0.8.15)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  maintenance can be found at:
             https://www.ibm.com/support/pages/java-sdk
  

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:

  IJ49773

Fix information

• Fixed component name

  OPENJDK CLASS L

• Fixed component ID

  621800100

Applicable component levels