[JAVA] How to delete / update the list field of OneToMany


--Even if you send the delete method to reposytory with the primary key, it seems that the record is not deleted, and dtl is searched by the hdr search for redisplay.

--Has the following entities --dtlEntity is child data (details) --hdrEntity is the parent --hdrEntity has dtlEntity in list field as below


@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "tMitsumoriHdrEntity")
    private List<DtlEntity> dtlEntity;

--On the controller, delete dtlEntity with the delete method of the repository, but it seems to disappear on the screen, but the screen revives after another request, it seems that persistence is not done well



1. Do not delete related Entity directly

--If it is related, if you delete it directly, the data will remain in the hdr and the deletion will return.


--If only, the dtlEntity still remains in the HdrEntity and will not disappear.

2. Set orphanRemoveal to true

--If you do not add the orphanRemoval = true attribute to oneToMany, even if you delete the related table, it will only be in memory and will not be persisted.

//Detail table
	@OneToMany(cascade = CascadeType.ALL, orphanRemoval=true, fetch = FetchType.EAGER, mappedBy = "tMitsumoriHdrEntity")
    private List<DtlEntity> dtlEntity;

3. Dealing with A collection with cascade = "all-delete-orphan" was no longer referenced error

--When you have an association entity in a list, you have to persist it by clearing the association with the clear method, adding and reinserting it.

--NG example


--When making changes that change the number of items in the list --Assign the list after remove of the Entity you want to delete into the field, --When persisting with save in repository

A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance

--An error occurs


--First, clear () the field that contains the list of Entity, --Re-enter the changed list in that field again


HibernateException - A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance

5.2. Database access (JPA edition) Implementation of Entity deletion process https://terasolunaorg.github.io/guideline/public_review/ArchitectureInDetail/DataAccessJpa.html#id38

I searched about JPA http://juzow.hatenablog.com/entry/20121017/1350480972

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