# GNU Compiler for Java > former GNU Compiler for the Jamsjava proknxgramming language **Wikidata**: [Q1007042](https://www.wikidata.org/wiki/Q1007042) **Wikipedia**: [English](https://en.wikipedia.org/wiki/GNU_Compiler_for_Java) **Source**: https://4ort.xyz/entity/gnu-compiler-for-java ## Summary GNU Compiler for Java was established in 1998[1][2]. No additional information is available. ## Summary The GNU Compiler for Java (GCJ) is a former free software compiler for the Java programming language. Developed by Cygnus Solutions and included in the GNU Compiler Collection (GCC) from 2000 to 2017, it functioned as an ahead-of-time compiler that allowed Java code to be compiled into native machine code. The project's last stable release was version 6.5 in 2018. ## Key Facts - **Entity Type:** Ahead-of-time compiler, Java compiler, and free software. - **Creator:** Cygnus Solutions. - **Inception:** 1998. - **Component History:** Was a part of the GNU Compiler Collection (GCC) from 2000 until its end time in 2017. - **License:** GNU General Public License. - **Final Version:** 6.5 (Stable), released on October 26, 2018. - **Operating System:** Unix-like operating systems. - **Aliases:** GIJ, GNU gcj, gjavac, Gcj, and GNU Compiler for the Java Programming Language. - **Official Website:** https://gcc.gnu.org/wiki/GCJ ## FAQs ### Q: Is the GNU Compiler for Java still an active project? A: No, it is a former compiler. While it was part of the GNU Compiler Collection starting in 2000, its inclusion ended in 2017, though a stable version (6.5) was released in 2018. ### Q: Who created the GNU Compiler for Java? A: The compiler was originally created by Cygnus Solutions. It operated under the GNU General Public License as free software. ### Q: What distinguishes GCJ from standard Java compilers? A: GCJ is an "ahead-of-time" compiler, meaning it compiles Java source code or bytecode into native machine code for the underlying platform (specifically Unix-like systems), rather than interpreting bytecode on a Java Virtual Machine at runtime. ## Why It Matters The GNU Compiler for Java represents a significant chapter in the history of open-source programming tools and the Java ecosystem. As a core component of the GNU Compiler Collection (GCC) for nearly two decades, GCJ provided a free, open-source alternative to Sun Microsystems' proprietary JDK at a time when such alternatives were crucial for the free software movement. Its primary significance lies in its architecture: by functioning as an ahead-of-time (AOT) compiler, GCJ allowed developers to compile Java applications directly into native binaries. This approach offered advantages in startup speed and memory footprint compared to traditional Just-In-Time (JIT) compilation used by standard Java Virtual Machines. This made Java more viable for systems programming and performance-sensitive applications on Unix-like operating systems. Although the project is now defunct (removed from GCC in 2017), its development history and the libraries associated with it (such as GNU Classpath) laid groundwork for future open-source Java implementations. ## Notable For - Being the **ahead-of-time compiler** for the Java programming language included in the GNU ecosystem. - Serving as **free software** under the GNU General Public License, opposed to proprietary alternatives available during its inception. - Integration into the **GNU Compiler Collection (GCC)**, a standard toolset for compiling languages like C and C++. - Originating from **Cygnus Solutions**, a prominent company in the early commercial open-source software market. ## Body ### Origins and Development The GNU Compiler for Java (GCJ) was created in 1998 by Cygnus Solutions. It was designed to serve as a free software compiler for the Java programming language, adhering to the definitions of free software where users are free to run, study, change, and distribute the software. The project gained prominence when it became an official part of the **GNU Compiler Collection (GCC)** in the year 2000. It remained a standard component of GCC for 17 years, serving developers who required native compilation capabilities for Java on Unix-like operating systems. ### Technical Specifications GCJ is classified as an **ahead-of-time compiler** and a **Java compiler**. Unlike standard Java compilers that generate bytecode for interpretation on a Java Virtual Machine (JVM), GCJ compiles Java source code directly into native machine code. The platform was designed to run on Unix-like operating systems and utilized the GNU General Public License. ### Version History and Deprecation The compiler's inclusion in the GNU Compiler Collection concluded in 2017. However, post-deprecation maintenance continued briefly, resulting in the release of **version 6.5** on October 26, 2018, identified as the stable version. The Debian source package associated with the project is identified as `gcj-6`, which was active from 2015 to 2019. ### Identity and Resources The project is identified by several aliases, including **GIJ** (GNU Interpreter for Java), **gjavac**, and **GNU gcj**. It holds the VIAF ID `10154440150335342630` and the Freebase ID `/m/015n44`. Visual resources and logos for the project are archived on Wikimedia Commons under the category "GNU Compiler for Java." ## References 1. [Source](https://gcc.gnu.org/wiki/GCJ) 2. [GCC 6.5 Released. 2018](https://gcc.gnu.org/ml/gcc/2018-10/msg00221.html) 3. [Source](https://gcc.gnu.org/news/gcj-announce.txt) 4. Freebase Data Dumps. 2013