APAR status
Closed as program error.
Error description
Error Message: The Server webUI intermittently cannot be reached for 1-15 minutes with error message "This site cant be reached". . Stack Trace: at com/ibm/security/util/MemoryCache.get(Cache.java:390(Compiled Code)) at com/ibm/jsse2/Y.getSession(Y.java:61(Compiled Code)) at com/ibm/jsse2/Y.a(Y.java:20(Compiled Code)) at com/ibm/jsse2/F.a(F.java:186(Compiled Code)) at com/ibm/jsse2/F.a(F.java:922(Compiled Code)) at com/ibm/jsse2/D.r(D.java:444(Compiled Code)) at com/ibm/jsse2/D$b.a(D$b.java:2(Compiled Code)) at com/ibm/jsse2/D$b.run(D$b.java:3(Compiled Code)) at java/security/AccessController.doPrivileged(AccessController.jav a:739) at com/ibm/jsse2/D$c.run(D$c.java:12(Compiled Code)) at org/apache/tomcat/util/net/SecureNioChannel.tasks(SecureNioChann el.java:423(Compiled Code)) at org/apache/tomcat/util/net/SecureNioChannel.handshakeUnwrap(Secu reNioChannel.java:483(Compiled Code)) at org/apache/tomcat/util/net/SecureNioChannel.handshake(SecureNioC hannel.java:238(Compiled Code)) at org/apache/tomcat/util/net/NioEndpoint$SocketProcessor.doRun(Nio Endpoint.java:1475(Compiled Code)) at org/apache/tomcat/util/net/SocketProcessorBase.run(SocketProcess orBase.java:49(Compiled Code)) at java/util/concurrent/ThreadPoolExecutor.runWorker(ThreadPoolExec utor.java:1160(Compiled Code)) at java/util/concurrent/ThreadPoolExecutor$Worker.run(ThreadPoolExe cutor.java:635) at org/apache/tomcat/util/threads/TaskThread$WrappingRunnable.run(T askThread.java:61) at java/lang/Thread.run(Thread.java:812) . N/A
Local fix
N/A
Problem summary
This is Oracle bug id JDK-8203190 The implementation of hashCode() in SessionId generates many collisions. The MemoryCache class is synchronized and because the HashMap gets really inefficient, many threads were blocked waiting for this class.
Problem conclusion
Better implementation of the hashCode. The affected jar is "ibmjsseprovider2.jar" The associated Hursley RTC Problem Report is 144312 The associated Austin Git issue is #101 The associated Austin APAR is IJ27807 JVMs affected: Java 7 The fix was delivered for Java 7 SR10FP75 and JAVA7.1 SR4FP75 The build level of this jar for the affected releases is 7.0 build_20200922--146 . This APAR will be fixed in the following Java Releases: 7 SR10 FP75 (7.0.10.75) 7 R1 SR4 FP75 (7.1.4.75) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IJ28404
Reported component name
SECURITY
Reported component ID
620700125
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-09-27
Closed date
2020-09-29
Last modified date
2020-09-29
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
SECURITY
Fixed component ID
620700125
Applicable component levels
[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"260"}]
Document Information
Modified date:
30 September 2020