Developing GNOME Applications with Java (Linux Journal)

Developing GNOME Applications with Java (Linux Journal)

You mistaken Java as a language with its JVM-with-JIT implementation used in Sun's JDK and other products. The article, on other hand, talks about developing Gnome application in Java with GCJ, which typically compiles Java applications directly to native executables.

So with GCJ you can apply all protections you described above and have solid protection offered by the language itself like automatic memory management. That along prevents heap corruption which can be exploited even if one uses all of the described prevention measures.