Open-source alternatives to Java Hll

There are lots of good things about working on the JVM, like a world class JIT, operating system threads, and a world class garbage collector. However, one limiting factor can often be the interaction between primitive types and referenced types in Java. Primitive types are the built in types…

High Scale Lib

High Performance Primitive Collections for Java

A fast object pool for the JVM

Transducers are composable algorithmic transformations. They are independent from the context of their input and output sources and specify only the essence of the transformation in terms of an individual element. Because transducers are decoupled from input or output sources, they can be used…

Library for creating In-memory circular buffers that use direct ByteBuffers to minimize GC overhead

Port of LevelDB to Java

Geohash utitlies in java

rtree

LMDB for Java

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

/ Written by Gil Tene, based on Apache Harmony version of java.util.HashMap. */

We are pleased to announce that GS Collections has been migrated to the Eclipse Foundation, re-branded as Eclipse Collections.

Reactive Programming for Android

A Persistent Java Collections Library

Immutable key/value store with efficient space utilization and fast reads. They are ideal for the use-case of tables built by batch processes and shipped to multiple servers.

fast-uuid is a Java library for quickly and efficiently parsing and writing UUIDs. It yields the most dramatic performance gains when compared to Java 8 and older; in benchmarks, it's a little more than fourteen times faster at parsing UUIDs and six times faster at writing UUIDs than the stock…

Failsafe is a JVM resilience library providing a collection of fault tolerance patterns for Java applications. It functions as an asynchronous execution wrapper that runs tasks in the background and returns futures to prevent thread blocking. The library allows for the composition of resilience policies, enabling multiple patterns to be stacked into a sequential pipeline. It includes specific implementations for circuit breaking to prevent system overload, rate limiting to control traffic flow, and a framework for managing retries and fallbacks. Capability areas cover traffic management thro

This library has been extracted from the master branch of Clojure (http://clojure.org)

Bloom filters are probabilistic data structures commonly used for approximate membership problems in many areas of Computer Science (networking, distributed systems, databases, etc.). With the increase in data size and distribution of data, problems arise where a large number of Bloom filters…

Externalsortinginjava

JavaFastPFOR: A simple integer compression library in Java

License: Apache 2.0

streamvbyte

This is an exploration of what a utilities library for Reactive Streams in the JDK might look like.