Google appengine

I have Always been a fan of Google applications, when Google started appengine few years ago I was very excited, the only problem was that it supported python and I was not much familiar with python. Within a year while I was leaning python GAE started supporting java.
The features and services provided were tempting enough for a developer like me to jump in right away. I started using it for one of my website, migrated it from php to java and while I was doing that it was always in my mind that the code is becoming increasingly coupled to gae, but I was stupid and lazy to write the code smart enough that could avoid the trap.