Compiling PIPE with Maven on Linux (Crunchbang/Debian)

I tried to install PIPE (Platform Independent Petri Net Editor) on my machine, but I had a strange problem. Following their instruction I did:

$ mvn install

but the compilation failed for some reason.

The first error was "invalid target release: 1.7" while compiling PIPE-gui.
This can be solved by putting your JAVA_HOME in your .bashrc or .bash_profile files. In my case:

export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/

Reloading the bash, and running again the compilation, PIPE-gui is successfully compiled.