SLOC for Java projects

Question

I neeed a free tool to count SLOC on a Java project. I only really need the following metrics:

• SLOC
• number of comment lines
• optionally javadoc metrics
• optionally sort statistics by file type (.java, .js, .css, .html, .xml, etc)

Bonus:

• 100% Java, I don't like mix something like sloccount with cygwin
• netbeans plugin
• or preferably, maven plugin

Answer 1

Did you consider using Sonar (which uses its own internal tool since version 1.9, sonar-squid, instead of JavaNCSS which has some flaws and doesn't work well with Java 1.5 or 1.6 projects)? This is the kind of report you'll get:

alt text http://sonar.codehaus.org/wp-content/uploads/2009/05/sonar-squid.jpg

Sonar does a lot more than just collecting SLOC though, maybe not what you want.

Answer 2

My advice is don't.

You get what you measure for.

If you reward big LOC, you'll get a lot of LOC.

If you reward small LOC, you'll get perl.