IntelliJ content module supporting Grails projects built with Maven rather than Grails' own build system or Gradle: project import, a Maven-backed application model, run/debug via Maven goals, and a Maven node in the Grails project view.
There is no hard upper gate in the code, but Maven-built Grails is a 1.x/2.x arrangement (grails-maven-plugin); Grails 3 and later are Gradle-based and are handled by gradle-tooling instead.
One explicit version gate exists, in MavenCommandExecutor: for Grails < 2.1.0 the test-app goal mapping is skipped, because those versions must run tests as mvn -Dcommand=test-app -Dargs=<TestClassName> grails:exec rather than mvn grails:test-app -Dgrails.cli.args=<TestClassName> (IDEA-105206).
Content module org.apache.grails.intellij.module.maven, shipped as lib/modules/org.apache.grails.intellij.module.maven.jar.
Requires org.jetbrains.idea.maven and com.intellij.java at runtime — the Java debugger classes moved into the java plugin modules in 2026.2.