We are observing this on a number of our instances. We have a Logon.jsp on which after entering the username/pass you are directed to another page. Everything is fine and after sometime, when you try to login, instead of rendering the other page, a blank page appears. No errors thrown on the Java console.
Checking the file system, we see that when this appears sometimes the <jsp_name>_jsp.java file is missing or else the <jsp_name>_jsp.class file is missing or sometimes both are missing or sometimes both are present! Still the page is not displayed.
IS this something to do with the Class Loader not finding the class to display the page, even though it exists in the right location?