ProxyFactoryHelper.java

public static void validateProxyability(PersistentClass persistentClass) {
    Iterator properties = persistentClass.getPropertyIterator();
    Class clazz = persistentClass.getMappedClass();

    while(properties.hasNext()) {
        Property property = (Property)properties.next();
        validateGetterSetterMethodProxyability("Getter", property.getGetter(clazz).getMethod());
        validateGetterSetterMethodProxyability("Setter", property.getSetter(clazz).getMethod());
    }

}

public static void validateGetterSetterMethodProxyability(String getterOrSetter, Method method) {
    // getter/setter 존재하는데 final인지 확인
    if (method != null && Modifier.isFinal(method.getModifiers())) {
        throw new HibernateException(String.format("%s methods of lazy classes cannot be final: %s#%s", getterOrSetter, method.getDeclaringClass().getName(), method.getName()));
    }
}