Top 8 Java Caching Projects

Caffeine

43 15,186 9.7 Java

A high performance caching library for Java

Project mention: Otter, Fastest Go in-memory cache based on S3-FIFO algorithm | news.ycombinator.com | 2023-12-23

/u/someplaceguy,
Those LIRS traces, along with many others, available at this page [1]. I did a cursory review using their traces using Caffeine's and the author's simulators to avoid bias or a mistaken implementation. In their target workloads Caffeine was on par or better [2]. I have not seen anything novel in this or their previous works and find their claims to be easily disproven, so I have not implement this policy in Caffeine simulator yet.
[1]: https://github.com/ben-manes/caffeine/wiki/Simulator
[2]: https://github.com/1a1a11a/libCacheSim/discussions/20

Hazelcast

7 5,861 9.9 Java

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

Project mention: Does anyone know any good java implementations for distributed key-value store? | /r/ExperiencedDevs | 2023-06-08

You're probably looking for Hazelcast here. Note that it does much more than just a distributed k/v, but it will get you where you need to go.

WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Apache Geode

1 2,266 6.2 Java

Apache Geode
Ehcache

3 1,957 5.6 Java

Ehcache 3.x line

Project mention: GC, hands off my data! | dev.to | 2023-10-27

I decided to start with an overview of what open-source options are currently available. When it comes to the implementation of the on-heap cache mechanism, the options are numerous – there is well known: guava, ehcache, caffeine and many other solutions. However, when I began researching cache mechanisms offering the possibility of storing data outside GC control, I found out that there are very few solutions left. Out of the popular ones, only Terracotta is supported. It seems that this is a very niche solution and we do not have many options to choose from. In terms of less-known projects, I came across Chronicle-Map, MapDB and OHC. I chose the last one because it was created as part of the Cassandra project, which I had some experience with and was curious about how this component worked:

cache2k

4 702 0.0 Java

Lightweight, high performance Java caching
bazel-buildfarm

4 621 9.4 Java

Bazel remote caching and execution service

Project mention: Distcc: A fast, free distributed C/C++ compiler | news.ycombinator.com | 2023-06-01

It can be. By default it is local.
But it has protobufs interfaces (IIRC), so a distributed build farm would generate the grpc endpoints for their implementation and then you tell bazel on the command line (or via .bazelrc) the address of the build farm it can use.
There's a couple of projects that implement the distributed/grpc part, the main one is https://github.com/bazelbuild/bazel-buildfarm

coherence

10 413 9.7 Java

Oracle Coherence Community Edition (by oracle)
InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
core

2 178 8.9 Java

An advanced and highly optimized Java library to build frameworks: it's useful for scanning class paths, generating classes at runtime, facilitating the use of reflection, scanning the filesystem, executing stringified source code and much more... (by burningwave)

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).