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For some reason I had a typo in the maven-checkstyle-plugin <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-checkstyle-plugin</artifactId> <configuration> <configLocation>checkstyle.5.0.xml</configLocation> </configuration> </plugin> where I used the wrong name for the checkstyle file. However under Project Properties/SQE/Checkstyle NB told me that NB is 'Using Maven Checkstyle plugin configuration found in the project'. I only found out about this error since the maven goal checkstyle:check threw an error. Nb also should report (eg. in the project properties) that there is a problem with the configuration, eg the checkstyle file could not be found