The maven program requires the dev-java/forehead library to run, however the ebuild deos not list this among its DEPEND. This should be fixed. Reproducible: Always Steps to Reproduce: emerge -C forehead emerge maven-bin maven Actual Results: When running maven you would get a NoClassDefFoundException. Expected Results: The emerge maven-bin line should have installed dev-java/forhead as well.
maven makes use of packed jars, and this hole package is quite complex. however, vgarg is currently working on a new ebuild, which builds maven from source and which also removes the packed jars issue. in that version, all problems will be removed. not going to cleanup this ebuild.