Uncommented Empty Method Body finds instances where a method body does not contain statements, but there is no comment. By explicitly commenting empty method bodies it is easier to distinguish between intentional (commented) and unintentional empty methods. UncommentedEmptyMethodBody (Priority: 1, Ruleset: Documentation) https://docs.pmd-code.org/snapshot/pmd_rules_java_documentation.html#uncommentedemptymethodbody

When doing `String::toLowerCase()/toUpperCase()` conversions, use an explicit locale argument to specify the case transformation rules. Using `String::toLowerCase()` without arguments implicitly uses `Locale::getDefault()`. The problem is that the default locale depends on the current JVM setup (and usually on the system in which it is running). Using the system default may be exactly what you want (e.g. if you are manipulating strings you got through standard input), but it may as well not be the case (e.g. if you are getting the string over the network or a file, and the encoding is well-defined and independent of the environment). In the latter case, using the default locale makes the case transformation brittle, as it may yield unexpected results on a machine whose locale has other case translation rules. For example, in Turkish, the uppercase form of `i` is `İ` (U+0130, not ASCII) and not `I` (U+0049) as in English. The rule is intended to *force* developers to think about locales when dealing with strings. By taking a conscious decision about the choice of locale at the time of writing, you reduce the risk of surprising behaviour down the line, and communicate your intent to future readers. UseLocaleWithCaseConversions (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#uselocalewithcaseconversions

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#emptycatchblock

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#emptycatchblock

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#emptycatchblock

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#emptycatchblock

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#emptycatchblock

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 1, Ruleset: Error Prone) https://docs.pmd-code.org/snapshot/pmd_rules_java_errorprone.html#emptycatchblock

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/snapshot/pmd_rules_java_documentation.html#uncommentedemptyconstructor