Unused Private Method detects when a private method is declared but is unused. UnusedPrivateMethod (Priority: 1, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_bestpractices.html#unusedprivatemethod

Unused Private Method detects when a private method is declared but is unused. UnusedPrivateMethod (Priority: 1, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_bestpractices.html#unusedprivatemethod

For classes that only have static methods, consider making them utility classes. Note that this doesn't apply to abstract classes, since their subclasses may well include non-static methods. Also, if you want this class to be a utility class, remember to add a private constructor to prevent instantiation. (Note, that this use was known before PMD 5.1.0 as UseSingleton). UseUtilityClass (Priority: 1, Ruleset: Design) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_design.html#useutilityclass

Unused Private Method detects when a private method is declared but is unused. UnusedPrivateMethod (Priority: 1, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_bestpractices.html#unusedprivatemethod

For classes that only have static methods, consider making them utility classes. Note that this doesn't apply to abstract classes, since their subclasses may well include non-static methods. Also, if you want this class to be a utility class, remember to add a private constructor to prevent instantiation. (Note, that this use was known before PMD 5.1.0 as UseSingleton). UseUtilityClass (Priority: 1, Ruleset: Design) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_design.html#useutilityclass

Reports parameters of methods and constructors that are not referenced them in the method body. Parameters whose name starts with `ignored` or `unused` are filtered out. Removing unused formal parameters from public methods could cause a ripple effect through the code base. Hence, by default, this rule only considers private methods. To include non-private methods, set the `checkAll` property to `true`. UnusedFormalParameter (Priority: 1, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_bestpractices.html#unusedformalparameter

Uncommented Empty Constructor finds instances where a constructor does not contain statements, but there is no comment. By explicitly commenting empty constructors it is easier to distinguish between intentional (commented) and unintentional empty constructors. UncommentedEmptyConstructor (Priority: 1, Ruleset: Documentation) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_documentation.html#uncommentedemptyconstructor

Uncommented Empty Constructor finds instances where a constructor does not contain statements, but there is no comment. By explicitly commenting empty constructors it is easier to distinguish between intentional (commented) and unintentional empty constructors. UncommentedEmptyConstructor (Priority: 1, Ruleset: Documentation) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_documentation.html#uncommentedemptyconstructor

Reports parameters of methods and constructors that are not referenced them in the method body. Parameters whose name starts with `ignored` or `unused` are filtered out. Removing unused formal parameters from public methods could cause a ripple effect through the code base. Hence, by default, this rule only considers private methods. To include non-private methods, set the `checkAll` property to `true`. UnusedFormalParameter (Priority: 1, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_bestpractices.html#unusedformalparameter

Reports parameters of methods and constructors that are not referenced them in the method body. Parameters whose name starts with `ignored` or `unused` are filtered out. Removing unused formal parameters from public methods could cause a ripple effect through the code base. Hence, by default, this rule only considers private methods. To include non-private methods, set the `checkAll` property to `true`. UnusedFormalParameter (Priority: 1, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.14.0/pmd_rules_java_bestpractices.html#unusedformalparameter