Any crossplatform NoSQL db solution?

I looking for some cross-platform nosql db solution.
Any advice? For Xamarin we can use LiteDB which is written in pure c#.
Is there any pure Java solutions for nosql db?

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For a basic key value store, you could just use the Java File API and store the json files on disk. Works quite well. For more elaborate querying, TTLs, etc. Couchbase Lite is pretty nice. Has an Android and iOS version, but also a portable Java implementation: