Our project is based on J2EE and we would like to know if there is a open source maven-plugin which either integrates with cloc (Refer How can I measure source code statistics?) or other tools?
Use Sonar for that!
As you can see in the demo site, when this tool analyses your project, it provides a lot of statistics (using their internal tool, Sonar Squid which is a replacement of the old JavaNCSS) :
alt text http://sonar.codehaus.org/wp-content/uploads/2009/05/sonar-squid.jpg
