26. Solution: SpotBugs

Solution: SpotBugs

Add SpotBugs to Reporting

To add SpotBugs to your site phase, add the following to the top level of your <project> element.

    <reporting>
        <plugins>
            <plugin>
                <groupId>com.github.spotbugs</groupId>
                <artifactId>spotbugs-maven-plugin</artifactId>
                <version>4.1.4</version>
            </plugin>
        </plugins>
    </reporting>

Run Maven Site

Run the site phase with the command:

mvn site

Check the Report

Open the target/site/spotbugs.html. You should see a High Priority error for HE_EQUALS_USE_HASHCODE. Clicking on this error will take you to a page describing the message in more detail.

Fixing the Error

To fix the error, you will need to implement the hashCode method in this class, because it is bad practice to overried equals and not hashCode. Once you fix the problem, you should be able to rerun the mvn site command and see the error removed from the report.