My application is balancing two app servers running tomcat.4, using one web server and sharing session across the app servers with In Memory Session Replication by Filip Hanik. I am attempting to create some data sets like a list of countries (that should never change) which would be available to all users who sign in by having some static methods in a class to load and retrieve this list.
The way the data set (Vector) is loaded is in the login servlet the static method GlobalDataSets.loadCountries() is called and a single static vector is loaded from a stateless ejb which makes the vector vailable for display in the jsp's.
So at this point we have a single GlobalDataSet class loaded on app1. However, when the next request to the server occurs it could go to app2 and the GlobalDataSet has not yet been loaded on that server. The only way the GlobalDataSet works is if the request for the list occurs on the same app server the user logged into. If the request for the list goes to the other server I get null pointers when calling the ejb's.
From what I can tell, this would be caused by some initialization somewhere at login. I tried putting in a SessionAttributeListener class that would notify app2 of a login made in app1,(based on a session attribute being added) which would then trigger a call on app2 to load the GlobalDataSet, but it still threw a null pointer exception on app2.
Any ideas on how I can get the context initialized on the second server if a user logs in on the first server or vice versa?
The last resort would be to login to each server specifically to get proper initialization, then restart the balance software for both. For obvious reasons I would prefer a way to code it.
Thanks, Brian
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