I´m starting to use PMD and I really want to know which are the most important rules or the rules that anybody can´t miss when using this tool.
I´m looking for some article or page with a list of rules that must be used in PMD, this tool has a lot of rules and it's difficult to select only a few of them.
Thanks!
The answer to this question is both general and subjective. However, the sourceforge pmd site has a list of some pre-packaged rulesets:
http://pmd.sourceforge.net/pmd-5.0.5/rules/index.html
You should probably use at least the basic ruleset. Beyond that, it's up to what kind of project you are working on and which rules apply to it.