awesome-jvm

Used to develop tools for the production of Java .class files

Code generation library creating Java classes at runtime without the help of a compiler

Jitescript

Bytecode generation library similar to BiteScript

Providing continuous, pauseless operation for Java applications

GC policy available in the Java Virtual Machine for IBM WebSphere Application Server V8

Completely passive GC implementation with bounded allocation limit, and lowest runtime performance overhead possible

The Garbage-First Garbage Collector

Ultra-Low-Pause-Time Garbage Collector

Book that addresses new challenges to garbage collection made by recent advances in hardware and software

Garbage collector optimized for low latency and very large heaps

Asynchronous non-blocking scenario driven load testing tool for testing HTTP servers

wrk2

A constant throughput, correct latency recording variant of wrk

Object-oriented, strong and static programming language with an emphasis on immutability, created by Red Hat

Dialect of Lisp created by Rich Hickey. Dynamically typed with emphasis on functional programming

A JVM-based Erlang VM

Pure, lazy, strongly typed functional programming language on the JVM

Frege

Pure functional programming language in the spirit of Haskell

gojava

Java bindings for Go packages

A simple dynamic language that makes extensive usage of

Optionally typed and dynamic language, with static-typing and static compilation capabilities

General-purpose, concurrent, strongly typed, class-based object-oriented language

Implementation of the Ruby language on the JVM

JPHP

PHP on the Java VM

Python for the Java Platform

Extension of the Scheme language, which is in the Lisp family of programming languages

Statically typed programming language for the JVM, Android and the browser

Java-centric implementation of lua vm built to leverage standard Java features

Lightweight high-performance JavaScript runtime in Java with a native JVM

Supports OCaml language v4. Generates plain Java bytecode and have seamless integration with Java

Rembulan

Rembulan is an implementation of Lua 5.3 for the JVM, written in pure Java with minimal dependencies

JVM-based interpreter for the R language for the statistical analysis

Strong and static programming language that combine object-oriented and functional programming ideas

Flexible and expressive dialect of Java, which compiles into Java 5 source code

Open-Source, Distributed, Deep Learning Library for the JVM

Fast statistical, machine learning & math runtime

Smile

Statistical Machine Intelligence & Learning Engine

Agera

Reactive Programming for Android by Google

Agrona

Library of data structures and utility methods that are a common need when building high-performance applications

A high-performance cross-system data layer for columnar in-memory analytics

bloofi

Java implementation of multidimensional Bloom filters

Insanely fast data interchange format and capability-based RPC system

caffeine

A high performance caching library for Java 8

Chronicle-Bytes

Low level memory access wrappers

Chronicle-Queue

Micro second messaging that stores everything to disk

Chronicle-Map

In-memory key-value store designed for low-latency and/or multi-process applications

clj-ds

Clojure's data structures modified for use outside of Clojure

colfer

Binary serialization format and class generator

Library of lightweight, self-contained mathematics and statistics components

CuckooFilter4J

Bloom filter replacement for approximated set-membership queries

cyclops

Integration modules for RxJava, Reactor, FunctionalJava, Guava & Javaslang

Eclipse Collections

Collections framework for Java

externalsortinginjava

Sort very large files using multiple cores and an external-memory algorithm

failsafe

A lightweight, zero-dependency library for handling failures

fasttuple

Collections that are laid out adjacently in both on- and off-heap memory

fast-uuid

Java library for quickly and efficiently parsing and writing UUIDs

Efficient cross platform serialization library for C++, C#, Go, Java, JavaScript, PHP, and Python

geohash

Java utility methods for geohashing

gs-collections

Goldman Sachs collections framework

hollow

Java library and comprehensive toolset for harnessing small to moderately sized in-memory datasets

high-scale-lib

Cliff Click's High Scale Library

hppc

High Performance Primitive Collections

injector

A new Executor for Java

java-concurrent-hash-trie-map

Java port of a concurrent trie hash map implementation from Scala collections

java-hll

Java library for the HyperLogLog algorithm

JavaFastPFOR

Library to compress and uncompress arrays of integers very fast

java-string-similarity

String similarity and distance measures, including Levenshtein edit distance and sibblings, Jaro-Winkler, Longest Common Subsequence, cosine similarity etc

Concurrent data structures currently missing from the JDK

High performance JSON library with advanced compile-time databinding

Claims to be the fastest JSON parser ever (copy of DSL-JSON)

jOOL

Useful extensions to Java 8 lambdas

Koloboke

Java Collections til the last breadcrumb of memory and performance

LevelDB

Rewrite (port) of LevelDB in Java

lightweight_trie

A very memory-efficient trie (radix tree) implementation

lmdbjni

Java API to LMDB (HawtJNI) which is an ultra-fast, ultra-compact key-value embedded data store written in C

lmdbjava

Java API to LMDB (JNR) which is an ultra-fast, ultra-compact key-value embedded data store written in C

low-gc-membuffers

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

lwjgl3

Java library that enables cross-platform access to popular native APIs useful in the development of graphics (OpenGL), audio (OpenAL) and parallel computing (OpenCL) applications

Collections backed by off-heap or on-disk storage

mph-table

Minimal Perfect Hash Tables are an immutable key/value store with efficient space utilization and fast reads

A small, zero-dep functional util library originating from Google

Memory buffer pool implementation similar to jemalloc

A layout-optimized Java data structure package

ohc

Java large off heap cache developed for Apache Cassandra 3.0

okio

Modern Java IO library that do clever things to save CPU and memory

onyx-java

Mirrors the Onyx Platform core API by providing a Java equivalent for each component of an Onyx workflow

Columnar storage format that uses the record shredding and assembly algorithm described in the Dremel paper

PauselessHashMap

A java.util.HashMap compatible map that won't stall puts or gets when resizing

pcollections

A Persistent Java Collections Library

Google's data interchange format

Lightweight threads and actors for the JVM

rtree

Immutable in-memory R-tree and R*-tree implementations in Java with reactive api

RTree2D

RTree2D is a 2D immutable R-tree with STR (Sort-Tile-Recursive) packing for ultra-fast nearest and intersection queries on plane and spherical surfaces

Standard for asynchronous stream processing with non-blocking back pressure

Reactive Streams Utilities

Future standard utilities library for Reactive Streams

RoaringBitmap

A better compressed bitset in Java

rollinghashjava

Rolling hash functions in Java

Reactive data applications on the JVM for Java, Groovy, Clojure and other

RxJava

Library for composing asynchronous and event-based programs using observable sequences

SmoothieMap

java.util.Map impl with worst put latencies more than 100 times smaller than java.util.HashMap

Simple Binary Encoding

High Performance Message Codec

splitmap

A parallel bitmap implementation

A Java software library of stochastic streaming algorithms

stormpot

A fast object pool for the JVM

stream-lib

A Java library for summarizing data in streams for which it is infeasible to store all events

streamvbyte

Fast integer compression in C using the StreamVByte codec

High-performance implementation of the Future abstraction

transducers-java

Composable algorithmic transformations independent from the context of their input and output sources

VarInt

No-deps variable int implementation without deps (by Bazel)

Functional Library for Java 8+

wire

Clean, lightweight protocol buffers for Android and Java

Zero-Allocation-Hashing

Hashing any sequences of bytes in Java, including all kinds of primitive arrays, buffers, CharSequences and more

Parser generator for reading, processing, executing, or translating structured text or binary files

auto

A collection of source code generators for Java

Dynamic data management framework and SQL parser plugin

Compiler plug-ins that find bugs or verify their absence

compile-testing

Testing tools for javac and annotation processors

derive4j

Algebraic data types constructors, pattern-matching, morphisms, optics and typeclasses

error-prone

Catch common Java mistakes as compile-time errors

GHCVM

A Haskell to JVM compiler that supports GHC Haskell

New experimental just-in-time compiler for Java that is integrated with the HotSpot virtual machine

grappa

Java fork of Parboiled. Write grammars with no preprocessing phase

Generate simple, safe and consistent value objects

Parser generator for use with Java

javaparser

Java 1.8 Parser and Abstract Syntax Tree for Java

JavaPoet

A Java API for generating .java source files

jparsec

Builds mini parsers in pure Java a la Haskell Parsec

A transpiler from Java to TypeScript/JavaScript

Design and build extensible DSLs and editors

Reduce the amount of boilerplate code that is commonly written for Java classes

parboiled

Parsing of arbitrary input text based on parsing expression grammars

Sulong

LLVM IR interpreter written in Java using Truffle and Graal

TeaVM

Ahead-of-time translating compiler (transpiler) from Java bytecode to JavaScript

Truffle

Framework for implementing languages as simple interpreters

Framework for development of programming languages and DSLs

hawtjni

A JNI code generator based on the JNI generator used in Eclipse SWT

Java Grinder

Compile Java bytecode to microcontroller assembly

j2v8

Java API for Google's V8 JavaScript engine

JavaCPP

JavaCPP provides efficient access to native C++ inside Java

jnr-ffi

Load native libraries without writing JNI code by hand

jssembly

Execution of native assembly from Java

NuProcess

A low-overhead, non-blocking I/O, external Process execution implementation for Java

Enriching the connections between the JVM and APIs used by C programmers

Aeron

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

armeria

Asynchronous RPC/API client/server library built on top of Java 8, Netty 4.1, HTTP/2, and Thrift

Chronicle-Network

A High Performance Network library

comcast

Simulating shitty network connections

gor

HTTP traffic replay in real-time

A high performance, open source, general RPC framework that puts mobile and HTTP/2 first

jRT

Measures response time of a java application to socket-based requests

JXIO

Java API over AccelIO (C library), a high-performance asynchronous reliable messaging and RPC library optimized for hardware acceleration

K3PO

Create arbitrary network traffic and behavior to certify whether a network endpoint behaves correctly

muxy

Simulating real-world distributed system failures

Async event-driven network library for high performance protocol servers & clients

okhttp

An HTTP+HTTP/2 client for Android and Java applications

one-nio

library for building high performance Java servers

proteus-java

Proteus Java Client based on RSocket

reactive-grpc

Reactive gRPC is a suite of libraries for using gRPC with Reactive Streams programming libraries

RSocket is a binary protocol for use on byte stream transports such as TCP, WebSockets, and Aeron

SimianArmy

Resiliency tool that helps ensure that your applications can tolerate random instance failures

pcap4j

Java library for capturing, crafting, and sending packets using libpcap

pig

A Linux packet crafting tool

Packet analyzer for network traffic capture

tcpflow

Captures TCP connections flows in a way that is convenient for protocol analysis and debugging

tcpreplay

Pcap editing and replay tools

Logging of system and process activity for long-term analysis, highlighting overloaded system

bcc

Tools for BPF-based Linux IO analysis, networking, monitoring, and more

Visualization of profiled software, allowing the most frequent code-paths to be identified quickly and accurately

ioping

Simple disk I/0 latency measuring tool

Disassembles class files into code that reflects the java bytecode

Java Heap Analysis Tool

Launch a postmortem debugger to analyze the content of a core-dump from a crashed JVM

Prints configuration information for a given process

Prints stack traces of threads for a given Java process

Monitors GC and compiler statistics in the JVM

Reports the structure of the processor, number of cores, hyperthreads and cache size

likwid

Read hardware performance counters on Intel and AMD processors

Control NUMA policy for processes or shared memory

System-wide hardware performance monitoring with easy-to-use interface at low overhead

Linux profiling with performance counters

perf-tools

Performance analysis tools based on Linux perf_events (aka perf) and ftrace

Capture system state and activity from a running Linux instance, then save, filter and analyze

Performance monitoring tools for Linux

Retrieve or set a processes’s CPU affinity

Like top but also shows instructions per cycle (IPC)

allocation-instrumenter

Java agent that rewrites bytecode to instrument allocation sites

aprof

Java memory allocation profiler

async-profiler

Sampling CPU profiler for Java featuring AsyncGetCallTrace + perf_events

BTrace

a safe, dynamic tracing tool for the Java platform

tracing, monitoring and testing tool for Java

bytestacks

Turn JVM bytecode execution into flame graphs

Record your entire java program. Replay on any machine

Machine learning guided Garbage collection log analysis tool. Auto-detect problems in the JVM GC logs and recommend solutions to it

GCViewer

GCViewer is a tool that visualizes verbose GC output

grav

A collection of tools to help visualise process execution

Tools for tracking down memory / JVM problems & generating predictable-as-possible VM behaviour

A Histogram that supports recording and analyzing sampled data value counts

A Metrics Reservoir implementation backed by HdrHistogram

HdrLogProcessing

Utilities for HDR Histogram logs manipulation

heapster

Production heap profiling for the JVM

honest-profiler

Sampling JVM profiler without the safepoint sample bias

jamm

Measure actual object memory use including JVM overhead

Tool for collecting diagnostic and profiling data about a running Java application with almost no performance overhead

java-sizeof

Memory consumption estimator for Java

Experimental harness and tests to aid the research in the correctness of concurrency support in the JVM, class libraries, and hardware

jfr-flame-graph

Converting JFR Method Profiling Samples to FlameGraph compatible format

jfr-report-tool

Tool for creating reports from Java Flight Recorder dumps

jitwatch

Log analyser / visualiser for Java HotSpot JIT compiler

jitwatch-intellij

JITWatch plugin for IntelliJ IDEA

jHiccup is an open source tool designed to measure the pauses and stalls associated with an application’s underlying Java runtime platform

Micro benchmarks written in Java and other languages targetting the JVM

jmh-compare-gui

GUI for comparing JMH results

Analyze actual object layout schemes, footprint, and references in JVMs

Helps resolve performance bottlenecks, pin down memory leaks and understand threading issues

Provide a native API to inspect the state and to control the execution of applications running in the JVM

jvmtop

Lightweight console application to monitor running jvms on a machine in top-like manner

jvm-profiler

Java Agent to collect various metrics and stacktraces for Hadoop/Spark JVM processes in a distributed way

Java heap analyzer that help find memory leaks and reduce memory consumption

leakcanary

A memory leak detection library for Android and Java

Measure the behavior of critical components in production environment

micrometer

An application metrics facade for the most popular monitoring tools

osquery is an instrumentation framework that expose the operating system as a high-performance relational database

Low-Level Hardware Monitoring and Management for Java

A vendor-neutral open standard for distributed tracing

perf-map-agent

Generate method mappings to use with the linux tool

perfj

Linux perf for java programs

polarbear

A tool to help diagnose OutOfMemoryError conditions

Riemann JVM Profiler

JVM agent which sends function-level profiler telemetry to a Riemann server for analysis, visualization, and storage

statsd-jvm-profiler

JVM agent profiler that sends profiling data to StatsD

Swiss Java Knife

Small set of tools for JVM troublshooting, monitoring and profiling

Tells you when and why code breaks in production

Tracer

Manages custom trace identifiers and carries them through distributed systems

Fully featured, easy to use, low overhead profiler

Zipkin

A distributed tracing system gather timing data for disparate services developed by Twitter

Capsule

Dead-Simple Packaging and Deployment for JVM Apps

The shell for the Java Platform

Drip

Fast JVM launching without the hassle of persistent JVMs

HotswapAgent

Redefine classes at runtime and skip the redeploy process

jvmkill

Agent that forcibly terminates the JVM when it is unable to allocate memory or create a thread

Nailgun is a client, protocol, and server for running Java programs from the command line without incurring the JVM startup overhead

Avian

Lightweight highly portable JVM with an option for AOT compilation

Android runtime (ART) is the managed runtime used by applications and some system services on Android

Modification of Java HotSwap VM with unlimited support for reloading classes at runtime

HotSpot virtual machine maintained and distributed by Oracle Corporation

JVM developed by IBM

Eclipse OpenJ9

Eclipse OpenJ9

J2ObjC

Translator from Java source to Objective-C code. Keeps shared code between iOS native apps and Android native apps

jvm.go

A JVM written in Go

ParparVM

An Open Source Java bytecode to C translator for iOS native development. Designed as a part of the WORA for mobile project

MobiDevelop's RoboVM Fork

Ahead of time compiler for JVM bytecode targeting iOS, Mac OSX and Linux

The only JVM that eliminates Java garbage collection pauses for large heap sizes

The only certified multi-platform build of OpenJDK: Free, 100% open source Java

Linux bcc/BPF using tcplife by Brendan Gregg

Linux tracing workshop

JVM monitoring with BPF, examples and hands-on labs for Linux tracing tools workshops

mini-post series where every post goes deep for only a single topic by Aleksey Shipilёv

Discussion on Mechanical Sympathy

Threads impact the performance of each other while modifying independent variables sharing the same cache line. Martin Thompson

The Java Virtual Machine Specification Java SE 8 Edition

Starting point for discussions of and information concerning the Java Memory Model

Unofficial guide to implementing the new Java Memory Model (JMM) specified by JSR-133

HotSpot Virtual Machine Garbage Collection Tuning Guide

Where is my safepoint? Nitsan Wakart

Design decisions, experience and constraints explained in high performance messaging systems

Digest of the top 10 performance related mistakes Martin Thompson has seen in production

The Utilization Saturation and Errors (USE) Method is a methodology for analyzing the performance of any system. Brendan Gregg

An introduction to distributed systems

Kyle Kingsbury (author of Jepsen)

For expert programmers familiar with Java concurrency, but unfamiliar with the memory order modes available in JDK 9 provided by VarHandles

Measure instructions per cycle (IPC) for CPU utilization. Brendan Gregg

Brendan Gregg

Emmanuel Goossaert

Daniel Spiewak

Discussion list for JSR-166

Technical discussion about the development of the HotSpot bytecode compilers

HotSpot development mailing list

Technical discussion about the development of the HotSpot garbage collectors

Discussing how to code sympathetically to and measure the underlying stack/platform so good performance can be extracted

For expert Java who want to push their systems to the next level

Venue for discussing the latest research and developments in the area of managed language execution

FOSDEM 2018 Free Java devroom

The GC edition. Shenandoah, ZGC, Zing, Fibers, Falcon etc

Kirk Pepperdine

Nitsan Wakart

Cliff Click

Cliff Click

Cliff Click

Nitsan Wakart

Nitsan Wakart

Martin Thompson

Martin Thompson

Gil Tene

JVM Language Summit 2015

JVM Language Summit 2016

JVM Language Summit 2017

Cliff Click

Gil Tene

Gil Tene at GOTO Conferences

Aleksey Shipilev

John Cuthbertson

Douglas Hawkins

Brendan Gregg

Brendan Gregg

Aleksey Shipilëv slightly-deeper-than-usual Shenandoah talk from Virtual Machine Meetup 2017

Aleksey Shipilev - Devoxx 2017/11

Volker Simonis

Programming and Performance Intro

Bugs and Coding Styles

Java vs C/C++

Debugging Data Races

Fast Bytecodes for Funny Languages

Struct of Arrays vs Array of Structs

The 3 Hardest Problems in Programming

Modern Hardware Performance and Cache Lines

Queuing In Practice

Cliff Click

Andrei Pangin

Sasha Goldshtein

Matthew Wilcox

Developing Oracle/Open JDK/Hotspot and other Java-related technologies

Lead Language Designer of Kotlin @ JetBrains

Java Language Architect at Oracle

Facebook, Netflix, Apple engineering

Cloud performance, kernel engineer, speaker, author

JRuby guy

Working with OpenJDK stuff @ Oracle

Creator of the HotSpot Server Compiler

Senior research scientist in the Scalable Synchronization Research Group within Oracle

RxJava committer that blogs about advanced RxJava

Author of the Java memory model

Azul Systems

Author of 250+ Java Specialists' Newsletters

JVM expert

Square, Google, open source hacker

HotSpot developer

Founder & CTO of Lightbend

Blogger. Author of JOOQ

Java language team alumnus

Chief Architect, Java Platform Group, Oracle

Pasty faced performance gangster

Java Champion

Working in high performance and distributed computing for nearly 20 years

Azul Systems

Netty developer

Forever undisputed SLOC Scala compiler dev

Hacking on the HotSpot JVM at Oracle

Innovative developer of high performance Java systems for competitive advantage

Author of ByteBuddy

Developer, Speaker, Author

Performance Analyst, developer, blogger

Parallel Universe. Leading Fibers and Continuations for the JVM

Java Champion. Occasional blogger and speaker. Best known for Joda projects and JSR-310

Ex-CTO, Ex-NASA researcher, network geek, messaging middleware designer

Project Reactor Lead @Pivotal

Doctor Deprecator. Java/JDK/OpenJDK developer

hacking HotSpot JVM @ Oracle

Deputy CTO at Typesafe Inc