what is the best persistent collection library?

1. kotlinx.collections.immutable

   1 11 1,274 6.5 Kotlin

   Immutable persistent collections for Kotlin

   

   kotlinx.collections.immutable it's a kotlin-focused collections library, but it can absolutely work with Java, especially because it extends the standard collection interfaces, so you can simply get an iterator from it

2. InfluxDB

   www.influxdata.com featured

   InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

   

3. java-immutable-collections

   2 2 43 6.3 Java

   Efficient Immutable/Persistent Collections for Java

   

   I'm not sure which one is best, but I always wanted to give https://github.com/brianburton/java-immutable-collections and/or https://github.com/lacuna/bifurcan (which, strictly speaking, does not satisfy your requirements, read the description).

4. bifurcan

   3 4 990 5.1 Java

   functional, durable data structures

   

   I'm not sure which one is best, but I always wanted to give https://github.com/brianburton/java-immutable-collections and/or https://github.com/lacuna/bifurcan (which, strictly speaking, does not satisfy your requirements, read the description).

5. MapDB

   4 5 4,971 0.0 Java

   MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

   

   Anyway, without further ado, I found MapDB (https://github.com/jankotek/mapdb) which does exactly that. Of course, they also provide their own Java collection implementations as well, so I suspect using it with Vavr would be a poor idea, but it is very cool in its own right anyway. Of course, there is also Apache Derby and HSQLDB, and those great options with a long history as well. I haven't played with these in a while though, so I might give them a try again soon for some personal stuff.

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