IV43175: FILEDESCRIPTORS LEAK WHEN ALL THE STREAM OBJECTS OR RANDOMACCESS FILE ARE NOT EXPLICITLY CLOSED BY THE APPLICATION

APAR status

• Closed as program error.

Error description

• Error Message: The following IOException is thrown when a new
  FileDescriptor is opened either by stream objects or
  RandomAccessFile or when a new process is started.
  java.io.IOException: error=24, Too many open files
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• When a FileDescriptor is shared by multiple instances of
  FileInputStream/FileOutputStream/RandomAccessFile objects,  IBM
  JDK closes the FileDescriptor only when no other instance shared
  the FileDescriptor. Hence, leakage of FileDescriptor is possible
  if the application did not explicitly close all the streams
  associated with a particular FileDescriptor object. Oracle JDK
  closes the FileDescriptor  while closing the first stream itself
   irrespective of multiple streams access the FileDescriptor.
  Hence the possibility of FileDescriptor leak is minimal.
  However, unexpected  IOException can happen if other streams try
  to access the FileDescriptor after closing the first stream.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR14
  6.0.1 SR6
  7.0.0 SR5
  .
   IBM JDK has introduced a new system property
  -Dcom.ibm.streams.CloseFDWithStream={trueIfalse} to support both
  the behavior. By default, the FileDescriptor will be closed
  while closing the first stream and thereby consistent with
  Oracle JDK behavior. If application want to retain the existing
  IBM JDK behavior, the property
  -Dcom.ibm.streams.CloseFDWithStream=false can be used. This
  property will be removed in a future Java release. Hence,
  application has to modified to adhere to the specification
  before migrating to higher release which do not support the
  property.
  

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

• R600 PSY

     UP

• R700 PSY

     UP