1️⃣🐝🏎️ The One Billion Row Challenge -- A fun exploration of how quickly 1B rows from a text file can be aggregated with Java

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with…

JFR file tool

A JUnit extension for asserting JDK Flight Recorder events

A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

An artifact of fully-specified annotations to power static-analysis checks, beginning with nullness analysis.

JDK main-line development https://openjdk.org/projects/jdk

a messagepack serialiser

Systems performance telemetry

Repository for OpenJDK Mission Control, a production time profiling and diagnostics tools suite. https://openjdk.org/projects/jmc

Visually explore your JMH Benchmarks

Micronaut Application Framework

Spoon is a metaprogramming library to analyze and transform Java source code. 🥄 is made with ❤️, 🍻 and ✨. It parses source files to build a well-designed AST with powerful analysis and transformati…

This mirror is deprecated - please start using https://github.com/openjdk/jmc

SigTest is the tool for checking incompatibilities between different versions of the same API.

JVM Dynamic Attach utility

The missing bridge between Java and native C++

HPPC-RT, fork of CarrotSearch's for Realtime

Playground project for JVM

A collection of source code generators for Java.

A High Dynamic Range (HDR) Histogram

A set of JMXConnector implementations to provide standard remoting connectivity to in VM MBeanServers and local JVMs

Java regular expressions made easy.

Brings .NET Core with C# support to netbeans (Create projects, open Projects, etc.)

Hidden Gems of JVM/JDK

NOT MAINTAINED

PerfJ is a wrapper of linux perf for java programs.