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Actually, OpenOffice is NOT written in Java (it's C++, if I recall). But certain components use Java. Without java, the suite is perfectly usable, just missing a few features.
I didn't say that OpenOffice was entirely written in Java. OpenOffice does use Java; especially 2.0 which utilizes it quite a bit. I'm not entirely certain what your point is, since OpenOffice is "Java on the Open Source desktop."