Maven 3 warnings about build.plugins.plugin.version

Since I updated to Maven 3 I get the following warning messages at each build : How can I get rid of these warnings? [INFO] Scanning for projects… [WARNING] [WARNING] Some problems were encountered while building the effective model for proj:id:jar:3.1 [WARNING] ‘build.plugins.plugin.version’ for org.apache.maven.plugins:maven-javadoc-plugin is missing. @ line 195, column 15 [WARNING] ‘build.plugins.plugin.version’ for … Read more