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http://issues.apache.org/bugzilla/show_bug.cgi?id=41682

           Summary: ClassCastException with BackupManager + debug logging
           Product: Tomcat 6
           Version: 6.0.7
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: [EMAIL PROTECTED]


(Still happening in 6.0.9, though that isn't an option in Bugzilla)

If I use the BackupManager for session replication AND turn on debug logging, I
get this exception when I try to invalidate the session:

java.lang.ClassCastException: org.apache.catalina.ha.session.BackupManager
cannot be cast to org.apache.catalina.ha.session.DeltaManager
        at 
org.apache.catalina.ha.session.DeltaSession.expire(DeltaSession.java:361)
        at 
org.apache.catalina.ha.session.DeltaSession.expire(DeltaSession.java:352)
        at 
org.apache.catalina.session.StandardSession.expire(StandardSession.java:660)
        at
org.apache.catalina.session.StandardSession.invalidate(StandardSession.java:1112)
        at
org.apache.catalina.session.StandardSessionFacade.invalidate(StandardSessionFacade.java:150)

The bug is easy to find in the source.  If debug logging is enabled, it tries to
cast manager to DeltaManager without an instanceof, even though it is doing an
instanceof immediately after:

    public void expire(boolean notify, boolean notifyCluster) {
        String expiredId = getIdInternal();
        super.expire(notify);

        if (notifyCluster) {
            if (log.isDebugEnabled())
                log.debug(sm.getString("deltaSession.notifying",
                                       ((DeltaManager)manager).getName(),
                                       new Boolean(isPrimarySession()),
                                       expiredId));
            if ( manager instanceof DeltaManager ) {
                ( (DeltaManager) manager).sessionExpired(expiredId);
            }
        }
    }

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