Zipkin is a distributed tracing system. It helps gather timing data needed to troubleshoot latency problems in service architectures. Features include both the collection and lookup of this data. If you have a trace ID in a log file, you can jump directly to it. Otherwise, you can query based on attributes such as service, operation name, tags and duration. Some interesting data will be summarized for you, such as the percentage of time spent in a service, and whether or not operations failed.
 
Applications need to be “instrumented” to report trace data to Zipkin. This usually means configuration of a tracer or instrumentation library. The most popular ways to report data to Zipkin are via HTTP or Kafka, though many other options exist, such as Apache ActiveMQ, gRPC and RabbitMQ. The data served to the UI are stored in-memory, or persistently with a supported backend such as Apache Cassandra or Elasticsearch.

Zipkin is a distributed tracing system. It helps gather timing data needed to troubleshoot latency problems in service architectures. Features include both the collection and lookup of this data. If you have a trace ID in a log file, you can jump directly to it. Otherwise, you can query based on attributes such as service, operation name, tags and duration. Some interesting data will be summarized for you, such as the percentage of time spent in a service, and whether or not operations failed.

Zipkin - Distributed tracing system

Byte Buddy is a code generation and manipulation library for creating and modifying Java classes during the runtime of a Java application and without the help of a compiler. Other than the code generation utilities that ship with the Java Class Library, Byte Buddy allows the creation of arbitrary classes and is not limited to implementing interfaces for the creation of runtime proxies. Furthermore, Byte Buddy offers a convenient API for changing classes either manually, using a Java agent or during a build.

byte-buddy - Runtime code generation for the Java virtual machine

JPHP is a new implementation for PHP which uses the Java VM. It supports many features of the PHP language (7.0+).How does it work? JPHP is a compiler like javac, it compiles php sources to JVM bytecode and then can execute the result on the Java VM. JPHP is not a replacement for the Zend PHP engine or Facebook HHVM. 

JPHP - An alternative to Zend PHP, like JRuby and Jython only for PHP

Apache Harmony is a modular Java runtime with class libraries and associated tools. One of the goals of the Harmony project is to create a design modular enough so that parts of the VM can be implemented in different languages. This project started in 2005 and it is under active development. 

 It adheres to the Java specification. It uses GNU classpath and JCVM a java byte code to C files converter. It has DRLVM, a virtual machine written in C++. It supports JIT compilation, JNI, Garbage Collector and Profile Collector etc.

Apache Harmony is a modular Java runtime with class libraries and associated tools. One of the goals of the Harmony project is to create a design modular enough so that parts of the VM can be implemented in different languages. This project started in 2005 and it is under active development.

Harmony - Open Source Java SE

Mutiny places events at the core of its design. With Mutiny, you observe events, react to them, and create elegant and readable processing pipelines. Mutiny is the perfect companion to tame the asynchronous nature of applications with non-blocking I/O. Declaratively compose operations, transform data, enforce progress, recover from failures and more. 
 
 Mutiny can be used in any asynchronous application such as event-driven microservices, message-based applications, network utilities, data stream processing, and reactive applications.

Mutiny places events at the core of its design. With Mutiny, you observe events, react to them, and create elegant and readable processing pipelines. Mutiny is the perfect companion to tame the asynchronous nature of applications with non-blocking I/O. Declaratively compose operations, transform data, enforce progress, recover from failures and more. 

Mutiny - An Intuitive Event-Driven Reactive Programming Library for Java

Immutable Clojure collections and a Transformation abstraction for Java 8+, immutably, type-safely, and with good performance. It provide support for RRB Tree, which is an immutable List (like Clojure's PersistentVector) that also supports random inserts, deletes, and can be split and joined back together in logarithmic time.

Paguro - Immutable Collections and Functional Transformations for the JVM

A Java library that keeps OAuth 2.0 service access tokens in memory for your usage.
    

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

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Zipkin - Distributed tracing system

byte-buddy - Runtime code generation for the Java virtual machine

JPHP - An alternative to Zend PHP, like JRuby and Jython only for PHP

Harmony - Open Source Java SE

Mutiny - An Intuitive Event-Driven Reactive Programming Library for Java

Paguro - Immutable Collections and Functional Transformations for the JVM

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

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Projects

Zipkin - Distributed tracing system

byte-buddy - Runtime code generation for the Java virtual machine

JPHP - An alternative to Zend PHP, like JRuby and Jython only for PHP

Harmony - Open Source Java SE

Mutiny - An Intuitive Event-Driven Reactive Programming Library for Java

Paguro - Immutable Collections and Functional Transformations for the JVM

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

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