Is JCGO JDK6-compatible?
No, at present JCGO does not support features introduced in the 3rd Java language specification (JLS 3). The Java generics, attributes (and migration from the GNU Classpath to JDK1.5/1.6) are in our far future plans. So, if your application really requires JDK1.5+ functionality then look for some 3rd-party competing product like Java to native code “through C” compilers or Direct Java to native code compilers.