Open Source Java Libraries - Page 31
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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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OOPEX(Open Object Persistence Extenstion)- is a java object orientated database development API, which allows developers to develop systems without worrying about the database design and development. .
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The Open Source Mobile Widget Platform is an Orange initiative to bring a complete software stack (client and server side) for distribution of mobile widgets on Java feature phones. http://www.orange.com/fr_FR/presse/communiques/cp101001fr2.jsp
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ObjectSql allows jdbc java api users to generate SQL statements using objects instead of string manipulation and still having total control over database access
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Odin Map Generator
Map Generation Application and API
Odin is a map generator derived from map generation experiments for a video game called Crypts of Eldor; after requests to release the tool, a decision was made to release a map editor based on this code. Additionally, a Java API is provided so that the map generator can be integrated into new software. -
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Official Android SDK for Stream Chat
Android Chat SDK ➜ Stream Chat API. UI component libraries for chat
This is the official Android SDK for Stream Chat, a service for building chat and messaging applications. This library includes both a low-level chat SDK and a set of reusable UI components. Most users start with the UI components and fall back to the lower-level API when they want to customize things. We're proud to say that we're the first Android Chat SDK that supports Jetpack Compose! We released our Compose UI Components one day after the official Jetpack Compose 1.0 release and our team members have been working hard on it since then. Now it's mature and stable enough for us to officially recommend it for all new applications and all modern chat implementations. If you're looking for something highly customizable and extremely performant, check out our Compose SDK. -
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Ollama4j
A simple Java library for interacting with Ollama server
Ollama4j is a lightweight Java library designed to simplify interaction with the Ollama server, enabling developers to integrate locally hosted large language models into Java applications with minimal friction. It provides a clean and developer-friendly API that abstracts the underlying REST communication, allowing users to focus on building features rather than handling low-level networking details. The library supports a wide range of core capabilities, including chat-based interactions, text generation, embeddings, and model management, making it suitable for both simple applications and more advanced AI-driven systems. It integrates seamlessly into Java ecosystems through Maven or Gradle dependencies, and it works with standard Java environments starting from JDK 11 and above. Ollama4j also includes support for advanced features such as tool or function calling, enabling models to interact with external systems and execute more complex workflows. -
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OnAccessFileEncryption
EaseFilter OnAcess File Encryption SDK
Transparent file encryption performs real-time I/O encryption and decryption of the files in any block data with 16 bytes. The encryption uses a 256 bits symmetric key to encrypt or decrypt the data with AES encryption algorithm. Auto file encryption protects data "at rest", meaning the transparent data and files encryption. It provides the ability to comply with policies which can be applied by users, processes and file type. This allows only authorized users and processes to access the encrypted files, unauthorized users and processes can’t access the encrypted files. The Auto FileCrypt Tool was developed with EaseFilter Encryption Filter Driver(EEFD) SDK, a file level encryption filter driver. Run the auto file encryption service with administrator permission, add the managed folders as encryption folder, when the files were added to the managed folder, the files will be encrypted automatically, when files were read, the data will be decrypted in memory automatically. -
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OntoMetriCalc
A Java API for measuring OWL ontologies
OntoMetriCalc (Ontology Metrics Calculator) is a Java API for measuring OWL ontologies based on Jena. -
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Open HTML to PDF
An HTML to PDF library for the JVM
Open HTML to PDF is a pure-Java library for rendering a reasonable subset of well-formed XML/XHTML (and even some HTML5) using CSS 2.1 (and later standards) for layout and formatting, outputting to PDF or images. Use this library to generated nice looking PDF documents. But be aware that you can not throw modern HTML5+ at this engine and expect a great result. You must special craft the HTML document for this library and use it's extended CSS feature like #31 or #32 to get good results. Avoid floats near page breaks and use table layouts. -
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Open Java Weather API
Java weather API that provides uniform access to different sources.
This package provides a common interface for users to access weather information from different data sources, and a skeletal implementation for data providers to quickly set up data access via Java. At a glance, the weather information is categorized into features and each feature is further divided into weather properties. Users query the data source by features or weather properties, and then receive the data as a list of weather reports. Strongly typed weather properties ensure that the data retrieved can be interpreted and formatted properly. For more information, see WeatherService class. Java Documentation: http://openjavaweatherapi.sourceforge.net/javadoc/ Currently sample implementations for two providers are included: http://forecast.io and http://openweathermap.org . (**Requires Java Version 6 or Newer**) -
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Open Location Code
A library to generate short codes
Plus Codes are like street addresses for people or places that don’t have one. Instead of addresses with street names and numbers, Plus Codes are based on latitude and longitude and displayed as numbers and letters. With a Plus Code, people can receive deliveries, access emergency and social services, or just help other people find them. Plus Codes technology is open source and free to create and use. They are much shorter than traditional global coordinates, so they’re easy to share. Plus Codes work whether you’re online or offline, you don’t need an internet connection. Plus Codes are based on a set of 20 alphanumeric characters. They do not include easily confused characters, are not case-sensitive, and exclude vowels. Plus Codes represent an area. The resolution of the area can be changed by adding or removing characters after the “+” sign. Simple, free to use, open-source digital addressing, for the entire world. -
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A Free Java C(ell)S(tream)V(alidator) library. OpenCell aims to implement set of interfaces with which user can manipulate values in 'cell' carried in a stream of csv(or any delimiter separated format) by a custom implemention of a rule.
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OpenGL Canvas
An Android library that provides views using openGL canvas
android-openGL-canvas is a lightweight OpenGL rendering library for Android that emulates the Android Canvas API using OpenGL ES 2.0. It’s designed for developers who want to achieve hardware-accelerated 2D graphics on Android while maintaining the familiar Canvas drawing commands. Ideal for real-time graphics, games, or custom views, this project provides a fast and flexible alternative to Android’s software rendering without the need for a full game engine. It bridges the gap between low-level graphics APIs and high-level UI rendering. -
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OpenXLS is the open source version of ExtenXLS -- a best-in-class Java spreadsheet SDK that allows you to read, modify and create Excel-compatible spreadsheets from your Java applications. Supports Excel 97-2012 file formats.
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Optimized Storage for temporal Data
open Optimized Storage of time series data
Beta version. Base class for optimized storage of time series data. Uses any kind of relational database. Cross plateform with multiple languages (C++, C#, Java). Conditional storage based on value variation : DeltaValue and DeltaTime params. Get back data without losts. -
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Manages Java application/tool options. Options are mapped to Java Bean properties using annotations. Options can be loaded from command line arg String[] array, an XML file, or a java properties file. Help texts can be generated.
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This java library can read oracle dump files generated by the oracle exp utility. The library has been tested with database dump files of oracle 8 and oracle 9.2 on unix.
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OtrosVfsBrowser
OtrosVfsBrowser download page
Since Google code is not supporting downloads, downloads can be found on sf.net. -
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OverlappingTreesPlainMap
The utility for quickest manipulations with difficult data.
This is Java library for working with overlapping trees both as with plain memory and as with hierarchical structure, with quick access to any levels and branches of tree (<page><...><section><line><word>tooLongWordForCurrentLi</line></page><page><line>neAndSectionTwoPages</word></line></section><...></page> (incorrect in classic XML)). There supported the cross-references (from="@leftPanel#template" target="$template"); cursors;copying and removing of parts; functionality to index and search data; convenient factory of dynamic generation of values and parts of data; simple variables and any objects as values and as unnamed data for manipulating. Every object of this container is an child of any numbers of trees and has dynamic address. The utility is not demanding to resources, requires no extraneous libraries and can be deployed in a small memory. It can run on mobile devices. Do not use linear algorithms, the speed is only slightly dependent on the size of data. -
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PDFhelp
A PDF based replacement for JavaHelp
PDFhelp is a replacement for the JavaHelp system based on the LGPL version of JPedal PDF library. It lets you to display PDF help content from the web from within your application, using only a few lines of code. There are some tutorials (naturally in PDF format) on the downloads page. -
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POJava is a simple, light-weight Java-based API for data processing and development. It includes an immutable DateTime object capable of parsing free-form dates in multiple languages and formats, and a variety of utilities for data transformation.
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PUB-Web is a peer-to-peer based volunteer computing environment for parallel applications written in Java.
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The Paderborn Thread Migration and Checkpointing (PadMig) library provides support for thread migration and checkpointing for the Java programming language.
