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IT Nursery > News > jpa

jpa

Java, Programming
IT Nursery

When and why JPA entities should implement the Serializable interface?

The question is in the title. Below I just described some of my thoughts and findings. When I had a very simple domain ...
  • June 3, 2022
  • 0 Comments
Programming, spring
IT Nursery

Spring boot – Not a managed type

I use Spring boot+JPA and having a problem while starting the service. Caused by: java.lang.IllegalArgumentException: Not an managed type: class com.nervytech.dialer.domain.PhoneSettings at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:219) ...
  • June 2, 2022
  • 0 Comments
Java, Programming
IT Nursery

How to persist a property of type List in JPA?

What is the smartest way to get an entity with a field of type List persisted? Command.java package persistlistofstring; import java.io.Serializable; import java.util.ArrayList; ...
  • May 31, 2022
  • 0 Comments
Java, Programming
IT Nursery

@UniqueConstraint annotation in Java

I have a Java bean. Now, I want to be sure that the field should be unique. I am using the following code: ...
  • May 31, 2022
  • 0 Comments
Java, Programming
IT Nursery

Can someone explain mappedBy in JPA and Hibernate?

I am new to hibernate and need to use one-to-many and many-to-one relations. It is a bi-directional relationship in my objects, so that ...
  • May 29, 2022
  • 0 Comments
Java, Programming
IT Nursery

Spring JPA selecting specific columns

I am using Spring JPA to perform all database operations. However I don’t know how to select specific columns from a table in ...
  • May 29, 2022
  • 0 Comments
hibernate, Programming
IT Nursery

How does JPA orphanRemoval=true differ from the ON DELETE CASCADE DML clause

I am a little confused about the JPA 2.0 orphanRemoval attribute. I think I can see it is needed when I use my ...
  • May 28, 2022
  • 0 Comments

Map enum in JPA with fixed values?

I’m looking for the different ways to map an enum using JPA. I especially want to set the integer value of each enum ...
  • May 28, 2022
  • 0 Comments
Java, Programming
IT Nursery

Make hibernate ignore class variables that are not mapped [duplicate]

This question already has answers here: What is the easiest way to ignore a JPA field during persistence? (10 answers) Closed 5 years ...
  • May 28, 2022
  • 0 Comments
Java, Programming
IT Nursery

JPA : How to convert a native query result set to POJO class collection

I am using JPA in my project. I came to a query in which I need to make join operation on five tables. ...
  • May 27, 2022
  • 0 Comments

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