static String findName(Object nameRetrievalTarget, String value) {
        requireNonNull(nameRetrievalTarget, "nameRetrievalTarget");
        if (DefaultValues.isSpecified(value)) {
            checkArgument(!value.isEmpty(), "value is empty.");
            return value;
        }
        return getName(nameRetrievalTarget);
    }
Returns the value of {@link Param}, {@link Attribute} if the value is not blank.
If the value is blank, it returns the name of the specified {@code nameRetrievalTarget} object
which is an instance of {@link Param}, {@link Attribute} or {@link Field}.
core/src/main/java/com/linecorp/armeria/internal/server/annotation/AnnotatedElementNameUtil.java