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