We started code review using Crucible, so i searched for some code analysis maven plugins. PMD is a Java code analysis tool and used to find potential problems like unused code, duplicate code, unused variables… PMD is useful and easy:

pom.xml:

<reporting>
<outputDirectory>target/reporting/pmd</outputDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
</plugin>
</plugins>
</reporting>

If you get the following error, simply add target-jdk configuration:
Caused by: net.sourceforge.pmd.ast.ParseException: Can’t use generics unless running in JDK 1.5 mode!

<reporting>
<outputDirectory>target/reporting/pmd</outputDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<configuration>
<targetJdk>1.5</targetJdk>
</configuration>
</plugin>
</plugins>
</reporting>

The PMD report is at pmd.html, but i couldn’t find categories, and more detailed reports.

We can also customize PMD rules & rulesets:

How to write a PMD rule?
How to make a new rule set?

CheckStyle is also a strong Maven 2 plugin for java code analysis. Simply running mvn checkstyle:checkstyle gives us detailed html/rss report(mvn site gives heap or memory error for some projects).

<reporting>
......
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
</plugin>
</plugins>
</reporting>

We can customize the reports generated by Maven’s site plugin. Simply add or overwrite <reports> tag at project.xml. The result gives us reports of project like dependencies, project info, project reports (CMD and PMD reports included), source repository, …

<reports>
<report>index</report>
<report>dependencies</report>
<report>project-team</report>
<report>mailing-list</report>
<report>cim</report>
<report>issue-tracking</report>
<report>license</report>
<report>scm</report>
<report>maven-pmd-plugin</report>
<report>maven-checkstyle-plugin</report>
</reports>