Open Source Java Libraries - Page 33
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Java Libraries
View 77 business solutionsBrowse free open source Java Libraries and projects below. Use the toggles on the left to filter open source Java Libraries by OS, license, language, programming language, and project status.
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Programming Accessory Kit
PAK is a collection of library code to handle the overhead of coding
PAK is a collection of library code to handle the overhead of coding things like read-write locks, reflective multithreaded programming and simple file io. This is a java library collection, please see my API below... -
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ProgressManager
Listen the progress of downloading and uploading in Okhttp
ProgressManager is an Android networking utility designed to monitor and manage upload and download progress for HTTP requests built with OkHttp. The library simplifies the implementation of progress tracking in Android applications by wrapping request and response bodies with listeners that report transfer status in real time. It is especially useful for applications that handle file uploads, media downloads, or large network transfers where users expect visible progress feedback. The project supports integration with Glide and other Android networking workflows, enabling developers to track image loading and resource downloads without extensive boilerplate code. Its architecture emphasizes minimal intrusion into existing networking stacks while maintaining compatibility with common Android development patterns. ProgressManager is widely used in applications requiring responsive file transfer interfaces and efficient network progress monitoring. -
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Prometheus JVM Client
Prometheus instrumentation library for JVM applications
It supports Java, Clojure, Scala, JRuby, and anything else that runs on the JVM. If you use Maven, you can simply reference the assets below. The latest version can be found on in the maven repository for io.prometheus. By default, counters, histograms, and summaries export an additional series suffixed with _created and a value of the unix timestamp for when the metric was created. Building the repository needs Java 11 (The project the project still supports Java 6 and Java versions > 11 dropped support for Java 6 output). We recommend to use an up-to-data Java 8 installation. The project provides the maven wrapper and therefore no local maven installation is needed. To build the repository just call ./mvnw verify. -
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Qigsaw
Dynamic modularization library which is based on Android App Bundles
Qigsaw is a dynamic modularization library which is based on Android App Bundles. It supports dynamic delivery for split APK without reinstalling the base one. Qigsaw-gradle-plugin will upload split APKs which require dynamic delivery during compilation, so you have to implement SplitApkUploader to upload split APKs to your own CND server. -
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Quasar
Fibers, channels and actors for the JVM
Quasar is a library that provides high-performance lightweight threads, Go-like channels, Erlang-like actors, and other asynchronous programming tools for Java and Kotlin. Quasar is developed by Parallel Universe and released as free software, dual-licensed under the Eclipse Public License and the GNU Lesser General Public License. Quasar fibers rely on bytecode instrumentation. This can be done at classloading time via a Java Agent, or at compilation time with an Ant task. Quasar’s lightweight thread implementation relies on bytecode instrumentation. Instrumentation can be performed at compilation time or at runtime using a Java agent. The easy and preferable way to instrument programs using Quasar is with the Java agent, which instruments code at runtime. Sometimes, however, running a Java agent is not an option. Quasar supports AOT instrumentation with an Ant task. -
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PROJECT MOVED: https://github.com/workplacesystems/queuj Java job queue built for concurrency control, scalability, persistence and resilience,
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QuickSlide
A tool to generate HTML-based slide shows.
This tool allow the generation of slide shows in HTML format (to run simply in the browser). It can not replace Microsoft Power Point, but, it allows you to create a slide show by writing Java code. The generated slide show can be run easily in the browser so it is platform independent and does not need any additional software installation, even on new installed OS or Smart phones. In this first pre-alpha version, the generated code supports simple text and basic lists only, but, I hope to add more features in the future. -
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QuickWeb
This tool can be used to create quickly the skeleton of a web site.
QuickWeb is a tool to quickly create a skeleton of a web site. The tool developed in Java and to create a web site, there's no need to manipulate HTML in the beginning. All you have to do is to write a simple Java code that will generate a web site of several pages. Created to help me with documenting different Sourceforge project, QuickWeb does not generate, for now, any CSS or JS code, but, it can generate the skeleton and the static content of a website composed of several web pages and ensure the navigation between them. It can, also, be used to create empty project and empty pages to avoid the annoying default HTML code. -
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QwicGUI
Java GUIs made easy!
QwicGUI, an easy-to-use open source Java class library developed by Impact Computing (http://www.impact-computing.com/), simplifies Java GUI development and offers out-of-the-box functionality not provided by the standard Java GUI classes. -
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RCER is a SAP R/3 Connector for Eclipse Rich Client Platform applications. It wraps up the SAP Java Connector (JCo) in a reusable way and provides additional common functions like connection definition, login dialog and status monitoring.
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RDF P
RDF Eclipse Plugins
RDF P (P stands for project or plugin or PIXEL) provides Eclipse plugins for working with RDF data: editors, views, builders, wizards etc. RDF P is based on OpenRDF/Sesame and bundles OWLIM Lite. Currently follwing features are included: * Turtle editor with syntax highlighting * Outline page displaying the RDF contents as table * Graph view displaying RDF as interactive graph * Builder to assemble RDF files into a local repository * SPARQL editor which access the local repository * New Turtle file wizard You can download Tawny which is an Eclipse IDE edition demonstrating RDF P. -
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As of 03/2017, this project is moved to GitHub: https://github.com/cyberborean/rdfbeans ---- A simple Java-to-RDF databinding framework for transparent mapping JavaBean-like objects to RDF resources and vice versa.
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RE2/J
linear time regular expression matching in Java
RE2/J is a high-performance regular expression engine implemented in pure Java as a port of Google’s C++ RE2 library. Unlike traditional regex engines such as Java’s java.util.regex, PCRE, or Perl’s implementation—which rely on backtracking and can suffer from catastrophic exponential runtimes—RE2/J guarantees linear-time matching relative to input size. It achieves this efficiency by simulating all possible matches in a single pass using a nondeterministic finite automaton (NFA), ensuring predictable and safe performance even with complex patterns. This makes RE2/J ideal for applications that must handle user-supplied regular expressions securely without the risk of denial-of-service through regex backtracking. While it omits some advanced features like backreferences and certain Java regex options, it supports the vast majority of practical expressions used in production code. RE2/J thus provides a reliable, safe, and scalable alternative for developers. -
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REST Countries
Get information about countries via a RESTful API
Get information about countries via a RESTful API. -
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Reporting engine library written in C. Create one XML file and generate PDF, HTML, TXT, and CSV reports based on queries. Has support for MySQL, PostgreSQL, ODBC. Bindings for PHP, Java, Python.
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RSocket
Java implementation of RSocket
Application protocol providing Reactive Streams semantics. RSocket provides a protocol for Reactive Streams semantics between client-server, and server-server communication. RSocket is a binary protocol for use on byte stream transports such as TCP, WebSockets, and Aeron. RSocket is intended to be consumed via one of the various implementation libraries which implement the RSocket Protocol. By default to make RSocket easier to use it copies the incoming Payload. Copying the payload comes at cost to performance and latency. If you want to use zero copy you must disable this. To disable copying you must include a payloadDecoder argument in your RSocketFactory. This will let you manage the Payload without copying the data from the underlying transport. You must free the Payload when you are done with them or you will get a memory leak. Used correctly this will reduce latency and increase performance. -
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Raken, web service controller, is based on JSON as a data definition language. it utilizes simple protocol, optional asynchronous interaction, recovery, localization, security, caching, batch, and multi-part messaging.
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RcpFuse application framework or skeleton that integrates Java libraries to help you develop Rich applications quickly and efficiently. With similar design goals as AppFuse; and in fact the first version was an offshoot from AppFuse.
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This project is the implementation of a communication protocol for real time exchange between remote components.
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RecyclerViewHeader
Super fast and easy way to create header for Android RecyclerView
Super fast and easy way to create header for Android RecyclerView. Just use a RecyclerView.Adapter that can inflate multiple types of items. -
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RedComm
RedComm is a Java library simplifying communication with a serial port
RedComm is a lightweight Java library. It simplifies communication over the serial port by providing methods and interfaces, which can be used to read and write to the serial port or over an emulated serial cable by using bluetooth. The major focus is on the ease of use of the library. Besides that the experienced user has the ability to change the reading and writing behaviour of the library. This means the user can easily extend and customize the RedComm library. Internally RedComm uses part of the RxTx Library (http://rxtx.qbang.org/wiki/index.php/Main_Page) for port communication. Thus RedComm helps the unexperienced user using RxTx. RxTx is licensed under the LGPL 2.1 (http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html). RedComm also provides facilities for event based serial communication with the help of threading in order to non-block ie. the gui thread of the corresponding application. RedComm is ideally suited for education e.g at schools.
