Lastest update of Addons/general/pcall addon contains an example of calling Java from J session using Java Native Interface (JNI) directly, without any connecting DLLs.
Native Windows front end of J (see syntax highliting) is calling Java (see Swing theme).
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If jvm.dll is not found, specify it directly in LIB noun in jni.ijs.
Contributed by OlegKobchenko