# DataNucleus

> java library

**Wikidata**: [Q1172181](https://www.wikidata.org/wiki/Q1172181)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DataNucleus)  
**Source**: https://4ort.xyz/entity/datanucleus

## Summary
DataNucleus is a free software library written in the Java programming language, designed primarily for object–relational mapping (ORM). It is cross-platform software capable of operating on multiple computing platforms and is distributed under the Apache Software License 2.0. The most recent documented version is 6.0.9.

## Key Facts
- **Primary Use:** DataNucleus functions as an object–relational mapping tool.
- **Programming Language:** It is written entirely in Java, an object-oriented programming language.
- **License:** The software is distributed under the Apache Software License 2.0.
- **Software Class:** It is classified as free software, allowing users to freely run, study, change, and distribute it.
- **Operating System:** It runs on cross-platform environments.
- **Latest Version:** Version 6.0.9 (referenced October 27, 2024).
- **Website:** The official website is located at https://www.datanucleus.org/.
- **Copyright Status:** The software is copyrighted.
- **Aliases:** Also known as "Datanucleus."

## FAQs
### Q: What is the primary function of DataNucleus?
A: DataNucleus serves as an object–relational mapping (ORM) solution. It allows developers to map Java objects to database records, bridging the gap between object-oriented programming and relational databases.

### Q: Under what license is DataNucleus distributed?
A: DataNucleus is distributed under the Apache Software License 2.0. This classifies it as free software, permitting users to study, modify, and distribute the code.

### Q: Is DataNucleus restricted to a specific operating system?
A: No, DataNucleus is cross-platform. It is capable of being implemented and operating on multiple computing platforms.

## Why It Matters
DataNucleus plays a critical role in the Java ecosystem by providing a robust persistence layer for applications. As an object–relational mapping (ORM) tool, it solves the "impedance mismatch" problem that occurs when storing object-oriented data in relational databases. This allows developers to focus on business logic rather than the intricacies of database connectivity and SQL queries.

Its significance is further bolstered by its classification as free software under the Apache Software License 2.0. This licensing model encourages widespread adoption and community contribution, as it allows users to freely run, study, change, and distribute the software. By being written in Java—the dominant object-oriented programming language incepted in 1995—DataNucleus remains relevant to a massive developer base. Its cross-platform nature ensures that it can be deployed in diverse computing environments, making it a versatile choice for enterprise and open-source projects alike. The active maintenance, evidenced by recent version updates, underscores its ongoing relevance in modern software development.

## Notable For
- **Cross-Platform Compatibility:** Capable of operating on multiple computing platforms without restriction.
- **Open Source Licensing:** Distributed under the permissive Apache Software License 2.0, facilitating broad usage and modification.
- **Java Integration:** Built specifically for Java, one of the world's most ubiquitous object-oriented programming languages.
- **Active Development:** The project maintains recent version releases, such as version 6.0.9.
- **Multilingual Documentation:** Wikipedia entries exist in German, English, and Japanese, indicating a global user base.

## Body

### Technical Overview
DataNucleus is a Java library utilized for object–relational mapping. Its core function is to persist Java objects into relational databases. As a Java-based solution, it leverages the object-oriented capabilities of the language, which was inceptioned in 1995. The software is designed to be cross-platform, meaning it is capable of being implemented and operating on multiple computing platforms.

### Licensing and Availability
The library is classified as free software. It is distributed under the terms of the Apache Software License 2.0. This licensing ensures that users have the freedom to run, study, change, and distribute the software and any modified versions. Despite being free software, the project retains a copyrighted status.

### Development and Versions
DataNucleus is an active project with a documented version history. As of late 2024, the software has reached version 6.0.9. Development resources and source code are accessible via platforms like GitHub (username: datanucleus) and SourceForge (project: datanucleus). It is also tracked on Open Hub and Quora.

### Identity and Web Presence
The official web portal for the project is https://www.datanucleus.org/, which provides English-language content. The project is identifiable by its logo and aliases such as "Datanucleus." It maintains a digital footprint across various knowledge bases, including Freebase (ID: /m/065_swf) and Wikipedia (available in German, English, and Japanese).

## References

1. [The datanucleus Open Source Project on Open Hub: Languages Page. Open Hub](https://www.openhub.net/p/datanucleus/analyses/latest/languages_summary)
2. [DataNucleus AccessPlatform 6.0 Release Notes](https://www.datanucleus.org/documentation/news/access_platform_6_0.html#_datanucleus_accessplatform_6_0_9)
3. Freebase Data Dumps. 2013
4. Quora