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Implementation for Apache Log4J, a highly configurable logging tool that focuses on performance and low garbage generation. It has a plugin architecture that makes it extensible and supports asynchronous logging based on LMAX Disruptor.

YAML 1.1 parser and emitter for Java

Core libraries for Apache Spark, a unified analytics engine for large-scale data processing.

The core Apache Kafka server and client libraries for building distributed streaming platforms.

Elasticsearch subproject :server

Provides logback encoders, layouts, and appenders to log in JSON and other formats supported by Jackson

High-level API that greatly simplifies using ZooKeeper.

Valkey and Redis Java client. Complete Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC

Hive Query Language

Implementation of mustache.js for Java