-source 1.5

[Guido Zockoll]

I am trying to "mavenize" my current project. It is a Java 5 project and
i get to following error from mvn:
 
java:[24,9] annotations are not supported in -source 1.3
(try -source 1.5 to enable annotations)
        @Override

But where should i define "-source 1.5"? I could not find any hint in
the documentation?
 
Thanks for help in advance
 
Guido