If you generate a parser using the 4.8 tool but use a 4.9 runtime, you will encounter a RuntimeMetaData warning or error during execution.

If you are not using a build tool, you must manually download the JAR and add it to your project's classpath: Download the JAR from Maven Central.

The most reliable way to obtain the specific 4.8-1 version is through official Maven repositories: antlr4-runtime-4.8-1.jar Maven Central Directory: Browse Version 4.8-1 Alternative Mirror: Red Hat GA Repository Why the 4.8-1 Version Matters

org.antlr antlr4-runtime 4.8-1 compile Use code with caution. You can view the full details on the Maven Repository page . 2. Gradle Dependency For Gradle projects, add this to your build.gradle file: implementation 'org.antlr:antlr4-runtime:4.8-1' Use code with caution. 3. Manual Installation (Classpath)

Developers often specifically search for version (released in January 2020) because ANTLR has a strict requirement that the version of the tool used to generate code must match the version of the runtime used to execute it.

Are you experiencing a , or are you setting up a new project from scratch? org.antlr » antlr4-runtime » 4.8-1 - Maven Repository

To include this runtime in a Maven project, add the following to your pom.xml :