[Defect] About method "isPrimitive" in ClassUtils

[mercyblitz]

The concrete code as below:

    public static boolean isPrimitive(Class<?> type) {
        return type.isPrimitive()
                || type == String.class
                || type == Character.class
                || type == Boolean.class
                || type == Byte.class
                || type == Short.class
                || type == Integer.class
                || type == Long.class
                || type == Float.class
                || type == Double.class
                || type == Object.class;
    }

Actually, String.class and other classes should not be classified in the "primitive" type, as the "simple" type better, the javax.management.openmbean.SimpleType is an example.