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I bought a Black Pearl Wax Apple tree to grow in the Bay Area in California. This fruit is popular in tropical areas of Asia, but it virtually impossible to find in supermarkets outside of Asia. I've scoured Google for how to grow Wax Apple, but could not find any useful information.

1. What kind of soil does it like?
2. Is it self-fruitful or do I need to cross-pollinate?
3. Does it like to be pruned?
4. Is it deciduous and can it withstand winters of 45 degrees Fahrenheit at night?
5. How much light does it prefer?
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I grow Wax Jambu in the Bay Area. They freeze outside in the winter, so I grow mine as a house plant in the sunniest window at my house. It does great. A big crop of fruit every year. You don't want to let it dry out too much. Down in Southern California, I've seen them thrive outdoors (in San Diego), but I don't think it will work so well outdoors in the Bay Area, unless you live in a microclimate that is especially warm. It doesn't get too big in the pot indoors. I think indoors, and in a 5 gallon, or so, container, it will stay smallish. Yet it has grown nearly to the ceiling in just a few years. We'll see what happens in the future.
I live in the Caribbean where there is only a rainy and dry season. Temperatures range from low 60’s to 80’s.
I was given 2 cuttings of the Java apple branch. I kept them in water and they grew roots after about 2 months. I planted one in a concrete pot out in a very windy but full Sun location and the other in a mostly shaded with afternoon speckled sun & almost no wind. The soil was from my compost. I have watered them once a week with tap water which is 9 PH, very alkaline. The one out in full Sun and high wind has not grown at even half the rate of the shaded one, which now (1 year from planting) is starting to bloom.
In terms of soil and water PH this plant seems to be very adaptable. It definitely needs heat being a tropical plant. It seems to be able to grow well in full Sun or part shade but definitely does not like high winds. It can also be dwarfed as mine are both in 4 gallon pots and look healthy. I hope this helps.