use https://github.com/yan-khonski-it/pmd-java-14
Java 11 and maven. PMD plugin is included.
Quick start. I use it as a template for other projects.
https://stackoverflow.com/questions/49398894/unable-to-compile-simple-java-10-java-11-project-with-maven/54989888#54989888 https://maven.apache.org/plugins/maven-pmd-plugin/examples/usingRuleSets.html https://maven.apache.org/plugins/maven-pmd-plugin/usage.html https://pmd.github.io/latest/pmd_userdocs_tools_maven.html