CONCURRENTMODIFICATIONEXCEPTION while Logging-in to a Servlet with Kerberos SSO (under high load).

(Doc ID 2298442.1)

Last updated on AUGUST 18, 2017

Applies to:

Oracle WebLogic Server - Version 12.2.1.0.0 and later
Information in this document applies to any platform.

Symptoms

Intermittent "500 Internal Server Error" is received by users while performing a Kerberos SSO login on Weblogic 12.2.1.0.0.

This issue is observed during high load and following errors are reported in WLS :

java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)
at java.util.LinkedList$ListItr.next(LinkedList.java:888)
at javax.security.auth.Subject$SecureSet$1.next(Subject.java:1070)
at weblogic.security.acl.internal.AuthenticatedSubject$1.run(AuthenticatedSubject.java:139)

Changes

 

Cause

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