Tomcat7 PPA for Ubuntu LTS 10.04.2
Solution 1:
You should be able to install tomcat7 from Debian's testing repository without any (or, worst case, with minor) dependency issues. Might not be a good idea to keep that repository updated, but then you can always sync the contents of http://cdn.debian.net/debian/pool/main/t/tomcat7/ locally on your machine and alert yourself in case of a new version.