Fixes are available
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21
APAR status
Closed as program error.
Error description
Very rarely, an FFDC is produced indicating a NullPointerException similar to the following: >Exception = java.lang.NullPointerException >Source = com.ibm.ws.tcpchannel.internal.SocketRWChannelSelector >probeid = 254 >Stack Dump = java.lang.NullPointerException > at com.ibm.ws.tcpchannel.internal.SocketRWChannelSelector.updat eSelector(SocketRWChannelSelector.java:193) > at com.ibm.ws.tcpchannel.internal.ChannelSelector.run(ChannelSe lector.java:227) > at java.lang.Thread.run(Thread.java:804) The error itself is harmless other than the appearance of the FFDC. It is produced because the ChannelSelector thread is processing connections that may have been closed by another thread, and there is a timing window where the ChannelSelector, while attempting to write an event trace, will dereference a null field obtained from a closed connection.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM WebSphere Application * * Server Liberty Profile - Channel Framework * **************************************************************** * PROBLEM DESCRIPTION: FFDC is produced for a * * NullPointerException in * * com.ibm.ws.tcpchannel.internal.SocketRW * * ChannelSelector.updateSelector. * **************************************************************** * RECOMMENDATION: * **************************************************************** Very rarely, an FFDC is produced indicating a NullPointerException similar to the following: >Exception = java.lang.NullPointerException >Source = com.ibm.ws.tcpchannel.internal.SocketRWChannelSelector >probeid = 254 >Stack Dump = java.lang.NullPointerException > at com.ibm.ws.tcpchannel.internal.SocketRWChannelSelector.updateSel ector(SocketRWChannelSelector.java:193) > at com.ibm.ws.tcpchannel.internal.ChannelSelector.run(ChannelSelect or.java:227) > at java.lang.Thread.run(Thread.java:804) The error itself is harmless other than the appearance of the FFDC. It is produced because the ChannelSelector thread is processing connections that may have been closed by another thread, and there is a timing window where the ChannelSelector, while attempting to write an event trace, will dereference a null field obtained from a closed connection.
Problem conclusion
Code was added to check for null and avoid the NullPointerException. The fix for this APAR is currently targeted for inclusion in fix pack 8.5.5.7. 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
PI46433
Reported component name
WAS LIBERTY COR
Reported component ID
5725L2900
Reported release
855
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-08-06
Closed date
2015-08-07
Last modified date
2015-08-07
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
WAS LIBERTY COR
Fixed component ID
5725L2900
Applicable component levels
R855 PSY
UP
Document Information
Modified date:
28 April 2022