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Well the white, just like the mottled and auburn are recessive genes and they must have two copies to express the color, but when some birds only have one copy, they will carry the gene and not show it so you won't know which carry it and which don't, unless you breed like white to black, then you know all of them have on copy of the white gene, white to mottled should give all chicks being solid black colored but carring one copy of white and one copy of mottled. So there's not much you can do.
But don't worry about it, hatch whites too, then get the other two colors and raise them. I'm getting all 4 colors of Javas ( Black, White, Mottled, and Auburn)