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 … Read more
jpa
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) … Read more
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; … Read more
@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: … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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. … Read more