IV07091: TIMEZONE.GETDISPLAYNAME SHOULD USE CONCURRENTMAP FOR CACHING DIS PLAY NAMES

APAR status

• Closed as program error.

Error description

• Error Message: Customer was seeing Hang
  .
  Stack Trace: The stack trace of the thread hung at the time of
  hang is
  3LKMONOBJECT
  java/util/HashMap@07000000021D4C38/07000000021D4C50:
  owner "WebContainer : 107" (0x0000000131030300), entry count 1
  
  3LKWAITERQ            Waiting to enter:
  
  3LKWAITER                "WebContainer : 0" (0x0000000116782F00)
  
  3LKWAITER                "WebContainer : 1" (0x0000000116788800)
  
  ...
  
  3XMTHREADINFO      "WebContainer : 107" (TID:0x0000000131030300,
  
  sys_thread_t:0x0000000130C22200, state:CW, native
  ID:0x00000000001393F5)
  prio=5
  
  4XESTACKTRACE          at
  
  java/text/DateFormatSymbols.getZoneStrings(DateFormatSymbols.jav
  a:325(Co
  mpiled Code))
  
  4XESTACKTRACE          at
  
  java/util/TimeZone.retrieveDisplayNames(TimeZone.java:449(Compil
  ed
  Code))
  
  4XESTACKTRACE          at
  
  ...
  
  3XMTHREADINFO      "WebContainer : 0" (TID:0x0000000116782F00,
  
  sys_thread_t:0x00000001194CDDF0, state:B, native
  ID:0x000000000012A321)
  prio=5
  
  4XESTACKTRACE          at
  
  java/util/TimeZone.getDisplayNames(TimeZone.java:418(Compiled
  Code))
  4XESTACKTRACE          at
  
  java/util/TimeZone.getDisplayName(TimeZone.java:385(Compiled
  Code))
  .
  

Local fix

Problem summary

• Date.toString was improved by eliminating static
  GregorianCalendar and SimpleDateFormat instances. However, it
  calls TimeZone.getDisplayName to get an abbreviation of a time
  zone. In the getDisplayName implementation, it uses a HashMap
  with synchronization. The HashMap should be replaced with a
  ConcurrentHashMap to improve concurrency.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR?
  .
  The use of ConcurrentHashMap has imporoved the concurrency and
   the hang that was seen before is avoided .
  .
  To obtain the fix:
  Install build 20110924 or later
  

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 5 CLASS LI

• Fixed component ID

  620500130

Applicable component levels

• R500 PSY

     UP