Use the find-sec-bugs tag for questions specifically about the Find Security Bugs plugin for SpotBugs.
Find Security Bugs (or "find-sec-bugs") is a SpotBugs plugin for security audits of Java web applications. It provides additional detectors to SpotBugs which has only few detectors dedicated to security by default. It can detect many vulnerability types including command injection, XPath injection, SQL/HQL injection, cryptography weaknesses and many more.
The software is licensed under LGPL just like spotbugs.
For more information, visit the official website.