[MNG-4173] Remove automatic version resolution for POM plugins o Strengthended model validator to bark with a nice error message before down stream code bubbles up with ugly exceptions. The new validation step applies only to local builds and not to dependency resolution via the metadata source to accept existing POMs
maven/components/branches/MNG-2766/maven-core/src/main/java/org/apache/maven/project/validation/DefaultModelValidator.java