How to Create a Custom Biome Provider

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I want to create a Custom Biome Provider which only generate my custom biomes, i tried a lot with overiding the Vanilla Biomeprovider and looked in the class how it works but that always only caused a crash, i tried creating a Gen Layer but the problem there is the rivers and Oceans still spawn, i want a completly Vanilla Bilme Free world, no rivers, no ocean, only my biomes, how is this possible and what i need to know to override the Provider?

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