A fix is available
APAR status
Closed as program error.
Error description
The following message is written to the CICS TG log and requests are not sent to the CICS server: CTG8433E Connection failure for IPIC connection to CICS server <CICS_server_name> reason = java.io.IOException: Already connected. A ConcurrentModificationException is reported: Exception in thread "Receiver-<URL>:<Port>(n)" java.util.ConcurrentModificationException at java.util.Vector$Itr.checkForComodification(Vector.java:1167) at java.util.Vector$Itr.next(Vector.java:1144) at com.ibm.ctg.server.isc.SessionPool.close(Unknown Source) at com.ibm.ctg.server.isc.Connection.closeSocket(Unknown Source) at com.ibm.ctg.server.isc.Connection.close(Unknown Source) at com.ibm.ctg.server.isc.Connection.connectionError(Unknown Source at com.ibm.ctg.server.isc.Receiver.run(Unknown Source) at java.lang.Thread.run(Thread.java:780) Additional search words msgCTG8433E msgCTG8433 CTG8433
Local fix
No work-around, the Gateway daemon must be restarted
Problem summary
**************************************************************** * USERS AFFECTED: All users of IPIC-connected CICS servers * **************************************************************** * PROBLEM DESCRIPTION: The Gateway daemon throws a * * ConcurrentModificationException when an * * IPIC connection fails to connect * **************************************************************** * RECOMMENDATION: * **************************************************************** When an IPIC connection can not be established, the sessions for the IPIC connection are terminated. The Gateway daemon throws a ConcurrentModificationException if the session termination occurs before the session initialization has completed. The Gateway daemon does not terminate. Further attempts to connect to the CICS server fail.
Problem conclusion
CICS TG has been corrected and will not throw the reported ConcurrentModificationException when a connection attempt fails.
Temporary fix
Comments
APAR Information
APAR number
PI06947
Reported component name
CTG V9 FOR Z/OS
Reported component ID
5655Y2000
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2013-11-26
Closed date
2014-03-13
Last modified date
2014-04-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI13189 UI15986
Modules/Macros
CTG00201 CTG00204
Fix information
Fixed component name
CTG V9 FOR Z/OS
Fixed component ID
5655Y2000
Applicable component levels
R900 PSY UI15986
UP14/03/20 P F403
Fix is available
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Document Information
Modified date:
15 August 2024