Develop Reference

Java Framework to maintain entity history automatically

I am working on a project where I need to create history of particular table automatically. I have used #Audited annotation for it but it's creating duplicate data in table.
I am running out of space due to duplicate data.Even EclipseLink is not sloving my problem.

You tagged your question with Hibernate, but if switching to Eclipselink would be an option for you, be sure to check out the History Policy feature of Eclipselink. It allows automatic historization of data.

Please check Hibernate Envers.
This component integrates with JPA and Hibernate, and takes care of maintaing a revision history for any #Audited annotated Entity.
There are some guides on the net:
Maintain the data versioning info with Spring Data — Envers
Spring Boot : How to add JPA and Hibernate Envers Auditing
Spring Boot + Hibernate + Hibernate Envers

Hibernate: many-to-many mapping with an order-column

I want to use a many-to-many relation between System & Device. I want the system to know its devices order.
I've seen here that I can do it using #OrderColumn.
How can I do it using hibernate xml configuration instead of annotation?

If you're using Hibernate you could try with
sort="unsorted|natural|comparatorClass"
order-by="column_name asc|desc"
as attributes of your relatonship declaration

#OrderColumn is the JPA annotation introduced in JPA 2.0. This works as an additional feature if we work hibernate through JPA. There is no equivalent replacement in hibernate who work with hibernate directly.

JPA specific solution for soft delete of entity in hibernate

I am using hibernate JPA implementation in our code. I want to perform soft delete of entity using JPA. I know for soft delete, hibernate provides #SQLDelete annotations. But I am looking for JPA specific solution. Is there any JPA specific solution for soft delete of entity?

Does hibernate have something like the eclipselink copygroups

In eclipselink, one can use a feature called copygroup, which is basically a concept similar to the entitygraph of jpa 2.1 by which one can obtain, copies of entities specifying which attributes and relationships of the entity graph can be copied.
https://wiki.eclipse.org/EclipseLink/Examples/JPA/AttributeGroup#Copy_Examples
is there a feature in hibernate that allows partial copying of entity object graphs using a copygroup / entity graph?

JPA 2.2 doesn't exist. JPA 2.1 provides Entity graphs, and that is available in ANY JPA 2.1 implementation (DataNucleus 3.3+, EclipseLink 2.5+, Hibernate 4.3+). That is the whole point of having something in a spec

I am confused of Hibernate?

I learnt JPA for ORM. Now I am asked to use Hibernate as my provider.
If I start with Hibernate it is going down in different concept.
Please say me How can I relate JPA and hibernate together.
JPA reduces my Java code into simple code for persisting Objects.
Now what does hibernate help JPA and what does it provide.
Anyone please explain in simple.

As Pascal answered here
JPA is just an API. To use JPA, you need an implementation of this API and such implementations are called persistence providers (EcliseLink, Hibernate, OpenJPA)

Hibernate is not another concept; it is just one of many JPA implementations. Another would be EclipseLink. If you and the implementations keep to the specification then switching the implementation is just a matter of changing a couple of lines in your persistence.xml (e.g. the <provider> tag and implementation specific properties). At least in theory...

JPA is an API specification for persisting objects. It defines a SQL like query language, and annotations for defining entities and relationships.
Hibernate is an implementation of JPA that has various extensions as well as a legacy API and query language. As long as you don't use any of the extensions of Hibernate and stick with the JPA API you can more or less treat it interchangeably with other JPA implementations such as OpenJPA, TopLink etc.