APAR status
Closed as program error.
Error description
Error Message: Performance issues may be noticed in code that heavily utilizes the java.lang.Class.getGenericInterface() or java/lang/Class.getClassRepository() methods. . Stack Trace: A javacore taken during the time of the issue will show multiple threads blocked on the following stack:4XESTACKTRACE at java/util/Hashtable.get(Hashtable.java: 617(Compiled Code))5XESTACKTRACE (entered lock: java/util/Hashtable@0x0000000044923FE0, entry count: 1)4XESTACKTRACE at java/lang/Class.getClassRepository Class.java:2045(Compiled Code))4XESTACKTRACE at java/lang/Class.getGenericInterfaces (Class.java:2081(Compiled Code)) .
Local fix
Problem summary
The performance issue is due to a synchronization bottleneck in the implementation of java/lang/Class and java/lang/Classloader.
Problem conclusion
The jvm has been updated to remove the synchronization bottleneck that caused the issue. . This APAR will be fixed in the following Java Releases: 6 R1 SR8 FP4 (6.1.8.4) 7 SR9 (7.0.9.0) 8 SR1 (8.0.1.0) 7 R1 SR3 (7.1.3.0) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IV70546
Reported component name
J9 COMMON CODE
Reported component ID
620700127
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-03-04
Closed date
2015-03-04
Last modified date
2015-03-04
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
J9 COMMON CODE
Fixed component ID
620700127
Applicable component levels
R260 PSY
UP
R270 PSY
UP
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Document Information
Modified date:
22 February 2022