By default the maven compiler plugin assumes you’re working with 1.3 compatible sources. So tiger (java 1.5) sources will throw an UnsupportedClassVersionError.
The solution is to configure the maven-compiler plugin in your pom file to generate 1.5 sources like this:
4.0.0
be.cappelleh.test
test
test
1.0-SNAPSHOT
http://maven.apache.org
maven-compiler-plugin
1.5
1.5
source
o http://maven.apache.org/plugins/maven-compiler-plugin/