Show me a picture and I can let you know for sure! If you have Bolbitis heudelotii, commonly called 'African Water Fern' I suppose I can see how someone might mix that up with Java fern windelov. . . It's a beautiful plant, but very slow-growing, and it needs to be kept in an area of high current in your tank to do well. . . otherwise, the rules are similar to that of growing Java Fern, it's a rhizome plant, so attach it, don't bury it - and keep it under low-light or it'll get all uggy with algae. It does take this plant a super long time to get big, but they're gorgeous when they're properly taken care of and thriving 
Hope that helps!
Hope that helps!