IJ24012: JAVA.UTIL.ZIP.DEFLATER OPERATIONS THROW JAVA.LANG.INTERNALERROR

APAR status

• Closed as program error.

Error description

• Error Message: A java.lang.InternalError with reason of "An
  unsupported level was specified" or "buffer error" is received
  when a user attempts to invoke java.util.zip.Deflater APIs.
  .
  Stack Trace: java.lang.InternalError: An unsupported level was
  specified
  at java.util.zip.Deflater.deflate(Deflater.java:444)
  at java.util.zip.Deflater.deflate(Deflater.java:366)
  or
  java.lang.InternalError: buffer error
  at java.util.zip.Deflater.deflateBytes(Native Method)
  at java.util.zip.Deflater.deflate(Deflater.java:455)
  at java.util.zip.Deflater.deflate(Deflater.java:377)
  .
  This issue is observed only on z/OS and Linux on Z, running on
  either:
  1. IBM z15 or LinuxONE III with its zEDC Integrated Accelerator
  2. IBM zEC12 or later, or LinuxONE or LinuxONE II, with the zEDC
  Express Adapter Card installed and enabled.
  

Local fix

• On z/OS, this issue can be worked around by specifying the
  following environment variable:
  _HZC_COMPRESSION_METHOD=SOFTWARE
  On Linux running on IBM z15 or LinuxONE III, this issue can be
  worked around by specifying the following environmment variable:
  DFLTCC_LEVEL_MASK=0x0000
  On Linux running on IBM zEC12, z13, z14, LinuxONE or LinuxONE II
  with zEDC Express Adaptor Card installed, this issue can be
  worked around by specifying the following environment variable:
  ZLIB_DEFLATE_IMPL=0x0
  The above options will force the Deflate compression operations
  to utilize a software based implementation, and may result in a
  performance degradation if hardware implementations were used
  before.   The options may also be picked up by other non-Java
  workloads that utilizes zlib implementation.
  

Problem summary

• A java.lang.InternalError with reason of "An unsupported level
  was specified" or "buffer error" is received when a user
  attempts to change the compression level of an existing Deflater
  instance via java/util/zip/Deflater.setLevel() API.  This API
  was not properly supported if the compression operations were
  performed with hardware-based acceleration.
  

Problem conclusion

• Fix is provided to properly handle the requested compression
  level change by reverting back to a software-based compression
  implementation.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP15  (8.0.6.15)
  .
  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