IJ52943: JAVA 21: PROBLEM EXTRACTING FILES FROM JAR/ZIP WITH NX/GZIP APPLIES TO AIX 7300-03

APAR status

• Closed as program error.

Error description

• When using the GZIP accelerator on Power 9 and Power 10
  Java 21 Semeru cannot find classes that are greater
  than 1KB.
  
  The problem is that when the zip entry is uncompressed
  using zlibNX only the first 1024 bytes of uncompressed
  data are returned.
  
  Then the method jdk.internal.loader.Resource.getBytes
  throws
  an EOFException with the message "Detect premature EOF".
  

Local fix

• Disable gzip accelerator for an application by setting
  this environment variable:
  # export ZLIB_DECOMPRESS_ACCEL=0
  

Problem summary

• When using the GZIP accelerator on Power 9 and Power 10
  Java 21 Semeru cannot find classes that are greater
  than 1KB.
  

Problem conclusion

• Changed the code to properly flush the pending
  uncompressed data
  

Temporary fix

Comments

• 7300-03 - use AIX APAR IJ52943
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IJ50829

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  AIX V7.3

• Fixed component ID

  5765CD300

Applicable component levels