https://issues.apache.org/bugzilla/show_bug.cgi?id=50950

           Summary: NotSerializableException:
                    org.apache.catalina.realm.GenericPrincipal
           Product: Tomcat 6
           Version: 6.0.32
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Cluster
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: ron...@echteman.nl


Because this issue (https://issues.apache.org/bugzilla/show_bug.cgi?id=47502)
is fixed I re-enabled using the security-constraint in web.xml to protect some
pages instead of using my own workaround. But now I get a somewhat similar
exception.

This is running Tomcat 6.0.32 (directly from your tar.gz) on Debian 5 in a
cluster of 3 nodes.
I access my password protected pages over https.

 Mar 11, 2011 1:20:48 PM org.apache.catalina.ha.session.DeltaManager
requestCompleted
 SEVERE: Unable to serialize delta request for sessionid
[7D6D6A80C080C132F7EDCDAA3DFCEFB7]
 java.io.NotSerializableException: org.apache.catalina.realm.GenericPrincipal
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
     at java.util.LinkedList.writeObject(LinkedList.java:943)
     at sun.reflect.GeneratedMethodAccessor65.invoke(Unknown Source)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
     at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
     at java.io.ObjectOutputStream.access$300(ObjectOutputStream.java:143)
     at
java.io.ObjectOutputStream$PutFieldImpl.writeFields(ObjectOutputStream.java:1677)
     at java.io.ObjectOutputStream.writeFields(ObjectOutputStream.java:462)
     at javax.security.auth.Subject$SecureSet.writeObject(Subject.java:1281)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
     at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
     at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
     at
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:422)
     at
java.util.Collections$SynchronizedCollection.writeObject(Collections.java:1602)
     at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)

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