In this guide, we’ll walk you through how to download the antlr-4.11.1-complete.jar , set it up on your system, and verify your installation. Why the "Complete" JAR? The complete.jar is a "fat jar" that includes:

While newer versions of ANTLR exist, many enterprise projects stick to to maintain compatibility with specific plugins (like those for IntelliJ or Eclipse) or to ensure that the runtime matches existing production environments. It is known for its robust support of Adaptive LL(*) parsing , which handles complex grammars with ease.

You can find the official binaries in two primary locations:

Used to generate your lexer and parser code from a grammar file ( .g4 ).

Add antlr-4.11.1-complete.jar to your CLASSPATH environment variable.

Once downloaded, move the file to a permanent directory (e.g., /usr/local/lib on macOS/Linux or C:\libraries on Windows). For macOS and Linux: Add the following to your ~/.bash_profile or ~/.zshrc :