Solving a maven-checkstyle-plugin ClassCastException for DetailAST

When the maven-checkstyle-plugin generates errors like:

antlr.CommonAST cannot be cast to com.puppycrawl.tools.checkstyle.api.DetailAST

it may help to remove these artifacts from your local Maven repository:

• antlr
• commons-beanutils
• maven-checkstyle-plugin

At least it worked for me. Found this suggestion on the issue tracker of the plugin.