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Nice spot, please consider to add to Butterflies and Moths of Indonesia mission: http://www.projectnoah.org/missions/2158...
It looks like a caterpillar in the family Lymantriidae to me: http://en.wikipedia.org/wiki/Lymantriida....
It looks very similar to a caterpillar in the genus Orgyia that occurs in North America, but I would be hesitant to see for sure that that could be the genus for this one.