Declaring a method parameter as final for an interface method is useless because the implementation may choose to not respect it. FinalParameterInAbstractMethod (Priority: 1, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#finalparameterinabstractmethod

Reports classes that may be made final because they cannot be extended from outside their compilation unit anyway. This is because all their constructors are private, so a subclass could not call the super constructor. ClassWithOnlyPrivateConstructorsShouldBeFinal (Priority: 1, Ruleset: Design) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_design.html#classwithonlyprivateconstructorsshouldbefinal

Whenever using a log level, one should check if it is actually enabled, or otherwise skip the associate String creation and manipulation, as well as any method calls. An alternative to checking the log level are substituting parameters, formatters or lazy logging with lambdas. The available alternatives depend on the actual logging framework. GuardLogStatement (Priority: 2, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_bestpractices.html#guardlogstatement

Reports classes that may be made final because they cannot be extended from outside their compilation unit anyway. This is because all their constructors are private, so a subclass could not call the super constructor. ClassWithOnlyPrivateConstructorsShouldBeFinal (Priority: 1, Ruleset: Design) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_design.html#classwithonlyprivateconstructorsshouldbefinal

Configurable naming conventions for method declarations. This rule reports method declarations which do not match the regex that applies to their specific kind (e.g. JUnit test or native method). Each regex can be configured through properties. By default this rule uses the standard Java naming convention (Camel case). MethodNamingConventions (Priority: 1, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#methodnamingconventions

Configurable naming conventions for method declarations. This rule reports method declarations which do not match the regex that applies to their specific kind (e.g. JUnit test or native method). Each regex can be configured through properties. By default this rule uses the standard Java naming convention (Camel case). MethodNamingConventions (Priority: 1, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#methodnamingconventions

Whenever using a log level, one should check if it is actually enabled, or otherwise skip the associate String creation and manipulation, as well as any method calls. An alternative to checking the log level are substituting parameters, formatters or lazy logging with lambdas. The available alternatives depend on the actual logging framework. GuardLogStatement (Priority: 2, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_bestpractices.html#guardlogstatement

Whenever using a log level, one should check if it is actually enabled, or otherwise skip the associate String creation and manipulation, as well as any method calls. An alternative to checking the log level are substituting parameters, formatters or lazy logging with lambdas. The available alternatives depend on the actual logging framework. GuardLogStatement (Priority: 2, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_bestpractices.html#guardlogstatement

Whenever using a log level, one should check if it is actually enabled, or otherwise skip the associate String creation and manipulation, as well as any method calls. An alternative to checking the log level are substituting parameters, formatters or lazy logging with lambdas. The available alternatives depend on the actual logging framework. GuardLogStatement (Priority: 2, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_bestpractices.html#guardlogstatement

Reports classes that may be made final because they cannot be extended from outside their compilation unit anyway. This is because all their constructors are private, so a subclass could not call the super constructor. ClassWithOnlyPrivateConstructorsShouldBeFinal (Priority: 1, Ruleset: Design) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_design.html#classwithonlyprivateconstructorsshouldbefinal

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

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: 3, Ruleset: Design) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_design.html#useutilityclass

Detects when a private field is declared and/or assigned a value, but not used. Since PMD 6.50.0 private fields are ignored, if the fields are annotated with any annotation or the enclosing class has any annotation. Annotations often enable a framework (such as dependency injection, mocking or e.g. Lombok) which use the fields by reflection or other means. This usage can't be detected by static code analysis. Previously these frameworks where explicitly allowed by listing their annotations in the property "ignoredAnnotations", but that turned out to be prone of false positive for any not explicitly considered framework. UnusedPrivateField (Priority: 3, Ruleset: Best Practices) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_bestpractices.html#unusedprivatefield

Ensure that resources (like `java.sql.Connection`, `java.sql.Statement`, and `java.sql.ResultSet` objects and any subtype of `java.lang.AutoCloseable`) are always closed after use. Failing to do so might result in resource leaks. Note: It suffices to configure the super type, e.g. `java.lang.AutoCloseable`, so that this rule automatically triggers on any subtype (e.g. `java.io.FileInputStream`). Additionally specifying `java.sql.Connection` helps in detecting the types, if the type resolution / auxclasspath is not correctly setup. Note: Since PMD 6.16.0 the default value for the property `types` contains `java.lang.AutoCloseable` and detects now cases where the standard `java.io.*Stream` classes are involved. In order to restore the old behaviour, just remove "AutoCloseable" from the types. CloseResource (Priority: 3, Ruleset: Error Prone) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_errorprone.html#closeresource

Ensure that resources (like `java.sql.Connection`, `java.sql.Statement`, and `java.sql.ResultSet` objects and any subtype of `java.lang.AutoCloseable`) are always closed after use. Failing to do so might result in resource leaks. Note: It suffices to configure the super type, e.g. `java.lang.AutoCloseable`, so that this rule automatically triggers on any subtype (e.g. `java.io.FileInputStream`). Additionally specifying `java.sql.Connection` helps in detecting the types, if the type resolution / auxclasspath is not correctly setup. Note: Since PMD 6.16.0 the default value for the property `types` contains `java.lang.AutoCloseable` and detects now cases where the standard `java.io.*Stream` classes are involved. In order to restore the old behaviour, just remove "AutoCloseable" from the types. CloseResource (Priority: 3, Ruleset: Error Prone) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_errorprone.html#closeresource

Avoid the use of value in annotations when it's the only element. UnnecessaryAnnotationValueElement (Priority: 3, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#unnecessaryannotationvalueelement

Enforce a policy for braces on control statements. It is recommended to use braces on 'if ... else' statements and loop statements, even if they are optional. This usually makes the code clearer, and helps prepare the future when you need to add another statement. That said, this rule lets you control which statements are required to have braces via properties. From 6.2.0 on, this rule supersedes WhileLoopMustUseBraces, ForLoopMustUseBraces, IfStmtMustUseBraces, and IfElseStmtMustUseBraces. ControlStatementBraces (Priority: 3, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#controlstatementbraces

Enforce a policy for braces on control statements. It is recommended to use braces on 'if ... else' statements and loop statements, even if they are optional. This usually makes the code clearer, and helps prepare the future when you need to add another statement. That said, this rule lets you control which statements are required to have braces via properties. From 6.2.0 on, this rule supersedes WhileLoopMustUseBraces, ForLoopMustUseBraces, IfStmtMustUseBraces, and IfElseStmtMustUseBraces. ControlStatementBraces (Priority: 3, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#controlstatementbraces

Enforce a policy for braces on control statements. It is recommended to use braces on 'if ... else' statements and loop statements, even if they are optional. This usually makes the code clearer, and helps prepare the future when you need to add another statement. That said, this rule lets you control which statements are required to have braces via properties. From 6.2.0 on, this rule supersedes WhileLoopMustUseBraces, ForLoopMustUseBraces, IfStmtMustUseBraces, and IfElseStmtMustUseBraces. ControlStatementBraces (Priority: 3, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#controlstatementbraces

Enforce a policy for braces on control statements. It is recommended to use braces on 'if ... else' statements and loop statements, even if they are optional. This usually makes the code clearer, and helps prepare the future when you need to add another statement. That said, this rule lets you control which statements are required to have braces via properties. From 6.2.0 on, this rule supersedes WhileLoopMustUseBraces, ForLoopMustUseBraces, IfStmtMustUseBraces, and IfElseStmtMustUseBraces. ControlStatementBraces (Priority: 3, Ruleset: Code Style) https://docs.pmd-code.org/pmd-doc-7.8.0/pmd_rules_java_codestyle.html#controlstatementbraces