I recently submitted a bug to the Java Bug Database. I received an email in reply with a bug ID, and a link to add the bug to my Bug Watch List. However, when I click on the link, I get a message, "This bug is not available".
My suspicion is that since the bug makes the Java VM crash, the "powers that be" regard the bug as a security issue, and have hidden the details. But in the process, they have made it impossible to use that web page to sign up for the watch list.