IV55760: JAVA.UTIL.SCANNER RUN OUT OF MEMORY WHILE PARSING A LARGE FILE, MORE THAN 200 MB, USING HASNEXTLINE API.

APAR status

• Closed as program error.

Error description

• Error Message: java.lang.OutOfMemoryError
  .
  Stack Trace: Exception in thread "main"
  java.lang.OutOfMemoryError: Java heap space
      at java.io.Reader.read(Reader.java:82)
      at java.util.Scanner.readMore(Scanner.java:2240)
      at java.util.Scanner.hasNextLine(Scanner.java:818)
      at TestScanner.main(TestScanner.java:17)
  .
  

Local fix

Problem summary

• The Scanner Class's hasNextLine and nextLine methods do not save
  the Scanner's last find position, due to which the Scanner's
  buffer size is doubled every iteration. This causes the
  application to throw an Out Of Memory Error once the buffer size
  exceeds the heap size.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     6    SR16      (6.0.16.0)
     6 R1 SR8       (6.1.8.0)
  .
  The Scanner Class's hasNextLine and nextLine methods is updated
  to save the matcher's last find position.
  

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

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