Things to do when taking over an application

We are taking over an application from a differnet team. we have just 5 days to learn everything possible about the application from this team. This original team will not be available after these five days.

At this point, we don't even know the size or the complexity of the application. All we know is it's a j2ee application. My guess is it's a fairly big application. I have been a developer the past few years and I have never undertaken anything like this before. So I am not even sure where to start.

My questions are but not limited to:

1. Where do I start?


2. What kind of questions should I be asking?


3. Is there any tools/methodologies out there that is used in these situations?


4. Any books I can read about it?