This plugin is unmaintained. Since its release official support for Antlr 4 has been added to Gradle. See https://docs.gradle.org/current/userguide/antlr_plugin.html#header

The antlr4-gradle-plugin provides an easy way to generate grammars with Antlr4 using Gradle.

Use the following snippet inside a Gradle build file:

The plugin adds a new task named antlr4. This task exposes 5 properties as part of its configuration

Basic generation

gradle antlr4

Dependency on generated sources

// make the Java compile task depend on the antlr4 task
compileJava.dependsOn antlr4

// add the generated source files to the list of java sources
sourceSets.main.java.srcDirs += antlr4.output

// add antlr4 to classpath
configurations {
   compile.extendsFrom antlr4
}