404 Error with ajax call which works after page refresh (F5)

Question

I have a javascript portal-like application (based on JPolite), when modules are loaded with $.ajax jquery call.

But the first request (when user has just started his browser) is failed with error 404. Supposing the app is hosted https://localhost:8443/context Firebug shows a request to /:8443/context/file.html which is incorrect

But after refreshing browser (F5) everything works fine and request became well-formed. The same issue was in another app based on JBoss portal but fixes after migrating to the latest version.

I suppose this may be connected with incorrect caching or so. Unfortunately google did not suggest anything useful so I'd appreciate any answers.

Answer 1

Seems I found the solution myself. The problem was that the log was not configured properly and I missed the important record: ERROR: org.hibernate.util.JDBCExceptionReporter - Already closed .
After some period of inactivity mysql server closes the current connection and request was failed with AlreadyClosedException. Adding validationQuery="select 1" to my context.xml seems fixed the issue.

Answer 2

After some period of inactivity mysql server closes the current connection

You should be closing connections as soon as you are finished with your database unit-of-work. Not just letting them sit idle until the SQL server closes the connection.