Fixes are available
9.0.5.0: WebSphere Application Server traditional Version 9.0.5 Refresh Pack
9.0.5.1: WebSphere Application Server traditional Version 9.0.5 Fix Pack 1
9.0.5.2: WebSphere Application Server traditional Version 9.0.5 Fix Pack 2
9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3
APAR status
Closed as new function.
Error description
Only product classes were stored in the IBM JDK shared class cache. By adding application classes to the shared class cache, applications can start up faster on subsequent server starts.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM WebSphere Application * * Server * **************************************************************** * PROBLEM DESCRIPTION: Improve startup time and reduce memory * * footprint using java class sharing. * **************************************************************** * RECOMMENDATION: * **************************************************************** Since WebSphere Application Server version 6.1, Java class sharing -- IBM JVM option "-Xshareclasses" -- is enabled by default for Application Server, Node Agent, and Deployment Manager processes in order to improve startup time and reduce memory footprint (1, 2). APAR PH12606 extends Java class sharing support within WebSphere Application Server to include Java Enterprise Edition applications, shared libraries and isolated resource providers. Specifically, the classloader types which load these entities have been upgraded to store and load class definitions to and from the server's Java shared class cache. This new application class sharing support introduced by APAR PH12606 will enable and disable according to the value of the "-Xshareclasses" option configured for each server process type. Visit Knowledge Center topic "Tuning the IBM virtual machine for Java" (2) to learn more about enabling java class sharing in WebShere Application Server. References: 1. WebSphere Application Server Network Deployment 9.0, "Tuning the IBM virtual machine for Java". https://www.ibm.com/support/knowledgecenter/SSAW57_9.0.0/ com.ibm.websphere.nd.multiplatform.doc/ae/ tprf_tunejvm_v61.html 2. IBM SDK, Java Technology Edition 8.0.0, "Class data sharing". https://www.ibm.com/support/knowledgecenter/en/SSYKE2_8.0.0/ com.ibm.java.vm.80.doc/docs/shrc.html
Problem conclusion
APAR PH12606 enables Java Enterprise Edition application class sharing in Application Server, Node Agent, and Deployment Manager processes that use the IBM JVM. The fix for this APAR is currently targeted for inclusion in fix pack 9.0.5.0. Please refer to the Recommended Updates page for delivery information: http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
Temporary fix
Comments
APAR Information
APAR number
PH12606
Reported component name
WEBSPHERE APP S
Reported component ID
5724J0800
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-05-29
Closed date
2019-06-27
Last modified date
2019-06-27
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
WEBSPHERE APP S
Fixed component ID
5724J0800
Applicable component levels
R900 PSY
UP
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
02 November 2021