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In the Project Properties of a Maven project, Netbeans offers to generate the POM section for the Checkstyle plugin. The generated section misses the reporting.plugins.plugin.version property, causing Maven to complain about it: [WARNING] Some problems were encountered while building the effective model for nl.lumc:ConceptRecognizer:war:1.0-SNAPSHOT [WARNING] 'reporting.plugins.plugin.version' for org.apache.maven.plugins:maven-checkstyle-plugin is missing. @ line 178, column 21 [WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build. [WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects. The problem can be fixed by adding <version>2.8</version> to the plugin section.
In fact, even after adding the <version> property, Netbeans gives the following hint on the <reporting> section: "The <reporting> section is deprecated, please move reports to the <configuration> section of the new Maven Sites plugin."