We have wild java plums here. Just came in a few minutes ago from knocking out 5 or so trees (12-20" in diameter). The fruit is bitter, the canopy gets heavy and the limbs snap off. The bark is dense and the folliage is heavy. There is lots of water/moisture in the trunk. The trees pose a danger to anyone walking under them, especially when fruiting because the canopy gets heavy.
Unless its a really good variety, I wouldn't plant 1. If possible, try before you plant. Planting trees is an incredible investment, figuring water, fertilizer, pruning, weeding, mowing. The wild ones here are awful. The wild pigs like them