Persistence provider for Java that supports final fields

Question

I\'m very new to Java but I\'ve been developing a habit to use final wherever possible declaring immutability which i think is a good thing. (Consider f#)

I\'ve read

Answer 1

This is honestly a strange idea.

By making fields final, you tell the compiler they'll never change after object creation. As a consequence, it is a reasonable assumption to not persist them, since they will never change. Well, by writing this, I assume you have the java culture, but the question you ask precisely tells the contrary.

In Java, persisted obejcts are "always" assumed to be POJO (in other words, Java Beans). A Java Bean must have (to be considered as such) an empty constructor that will allow persistance frameworks and so on to construct it using its empty constructor, by indirectly calling it through Class.newInstance()/.

There are fields where non empty constructors are used (like IoC containers - Guice, Spring and Tapestry IoC), but it is out of the scope of Java Beans, which have to be considered as data objects.