Hi, We get this error quite often with Java 1.5, we asked about it in the mailing list back in August. We found the error doesn't occur in Java 1.6. We usually see a stack trace with a NPE when doing getSession() or getCookies().
Here is what I wrote last time: We are getting an intermittent NullPointerException in Tapestry 5.0.5. We are running on Java 1.5. It seems that the RequestGlobals has a null Request when the call to getCookies is made (or that RequestGlobals is null). We cannot get the error to occur every time so testing is tricky, sometimes it occurs on the first request after the webapp starts with subsequent requests good for a few minutes before it occurs again. Other times it starts fine and pressing F5 100 times might make it occur. Our thought at the moment is that a ThreadLocal bug ( http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6550283 ) might be causing the RequestGlobals to initially be correctly initialised and stored in ThreadLocal but later on with more items being added this bug means further down the track, a new RequestGlobals is added with null values. -- Jason Lea
