IV59513: ZEDC HARDWARE COMPRESSES DATA EVEN WHEN COMPRESSION LEVEL IS SET TO ZERO ON Z/OS

APAR status

• Closed as program error.

Error description

• Error Message: When running Java application on zEC12 server
  with zEDC hardware compression it produces different results
  when java.util.zip.Deflater.setLevel(0) is set compared to
  software compression.  The API setlevel(0) means NO COMPRESSION.
   With zEDC hardware compression the data is compressesd, while
  it is not compressed with software compression.
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• The problem is caused because zEDC Express hardware compression
  does not consider compression level zero and it compresses the
  data.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     7 R1 SR1       (7.1.1.0)
     7    SR7       (7.0.7.0)
  .
  The zEDC code in the z/OS JDK has been updated to fallback to
  software compression when compression level is set to ZERO. This
  ensures that the data is not compressed when compression level
  is set to ZERO.
  

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

• R700 PSY

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