src/jdk.net/share/classes/jdk/net/ExtendedSocketOptions.java:257: warning: [TypeParameterUnusedInFormals] Declaring a type parameter that is only used in the return type is a misuse of generics: operations on the type parameter are unchecked, it hides unsafe casts at invocations of the method, and it interacts badly with method overload resolution.
    private static <T> T checkValueType(Object value, Class<?> type) {
                         ^
    (see https://errorprone.info/bugpattern/TypeParameterUnusedInFormals.md)