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 > > > -- > To unsubscribe: <mailto:[EMAIL PROTECTED]> > For additional commands: <mailto:[EMAIL PROTECTED]> > Troubles with the list: <mailto:[EMAIL PROTECTED]> > -- To unsubscribe: <mailto:[EMAIL PROTECTED]> For additional commands: <mailto:[EMAIL PROTECTED]> Troubles with the list: <mailto:[EMAIL PROTECTED]>