What is pmd?

PMD (Programming Mistake Detector) is a static code analysis tool for Java code. It is an open-source project that helps developers to identify potential problems in their code, such as code smells, performance issues, and possible bugs. PMD uses a set of pre-defined rules to scan Java code and identify any violations. These rules can be customized or extended to meet specific needs.

PMD can be integrated into various development environments like Eclipse, IntelliJ IDEA, or NetBeans. It also has a command-line interface for use in automated builds and as part of Continuous Integration (CI) or Continuous Delivery (CD) pipelines.

PMD's rules are divided into several categories like unused code, suboptimal code, best practices, and coding standards. It also offers support for various programming languages like Apex, PL/SQL, and Swift.

Overall, PMD is a valuable tool for developers looking to improve the quality of their code and reduce the potential for bugs or issues down the line.