Hi

You are simply trying to set a null value in a session, which is
forbidden.....something like session.setAttribute("HelloWorld", null);

I'm not sure this behaviour is specified in JSP specs though....
it's more because a Hashtable is used as the Map to store key=value session
attributes within Tomcat.


> I run a servlet on Tomcat3.3 and got the following error:
>
> java.lang.NullPointerException
>         at java.util.Hashtable.put(Hashtable.java:380)
>         at org.apache.tomcat.core.ServerSession.setAttribute(Unknown =
> Source)
> Can anyone kindly tell me what is wrong with my setting?  I changed the
> expiration time for session in server.xml
> and I am sure the SessionIdGenerator is set too.
>
>
> Bill
>
>
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