Java 1.5 is now deprecated from most modern os's and throws a
running mvn clean install on a new system will throw
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
Failure executing javac, but could not parse the error:
javac: source release 1.6 requires target release 1.6
As java 1.5 is usually not installed, and sis-parent/pom.xml has a maven.compile.target of 1.5
updating this to 1.6 resolves the problem, since the source code is already 1.6 based makes sense to update the target as well.