In Hibernate, by default an entity or collection is mutable. We can

add, delete or update an entity/collection.

To mark an entity/collection as immutable, we can use one of the

following:

@Immutable: We can use the annotation @Immutable to mark an

entity/collection immutable.

XML file: We can also set the property mutable=false in the XML

file for an entity to make it immutable.

https://www.baeldung.com/hibernate-immutable