I understand that there are static analysis tool e.g. FindBugs (there are bunch of them ) which do the code analysis statically and also can be scheduled as a part of continuous build process. These tool operate on a code part. A commenting is equally important, it would be great if the any discrepancy could be detected and reported to the concerned developer (as a part of build process).
I was looking for a capability wherein a tool could also flag the instances where appropriate comments are missing. I am referring to standard javadoc style comments like class, method etc.
According to an article I found, Checkstyle can do Javadoc validation
http://www.techrepublic.com/article/three-tools-that-make-java-code-review-painless-and-effective/5031836