The question is in the title. Below I just described some of my thoughts and findings. When I had a very simple domain model (3 tables without any relations), all my entities did NOT implement the Serializable interface. But when the domain model became more complex, I got a RuntimeException, saying that one of my … Read more
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) at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:68) at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getMetadata(JpaEntityInformationSupport.java:65) at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:145) at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:89) at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:69) at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:177) at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:239) at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:225) at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1625) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1562) Here is the Application.java file, @Configuration @ComponentScan @EnableAutoConfiguration(exclude = { … Read more
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; import java.util.List; import javax.persistence.Basic; import javax.persistence.Entity; import javax.persistence.EntityManager; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Persistence; @Entity public class Command implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) Long id; @Basic List<String> arguments … Read more
I have a Java bean. Now, I want to be sure that the field should be unique. I am using the following code: @UniqueConstraint(columnNames={“username”}) public String username; But I’m getting some error: @UniqueConstraint is dissallowed for this location What’s the proper way to use unique constraints? Note: I am using play framework. 12 Answers 12
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 I can traverse from either direction. mappedBy is the recommended way to go about it, however, I couldn’t understand it. Can someone explain: what is the recommended way to use it? what … Read more
I am using Spring JPA to perform all database operations. However I don’t know how to select specific columns from a table in Spring JPA? For example: SELECT projectId, projectName FROM projects 16 Answers 16
I am a little confused about the JPA 2.0 orphanRemoval attribute. I think I can see it is needed when I use my JPA provider’s DB generation tools to create the underlying database DDL to have an ON DELETE CASCADE on the particular relation. However, if the DB exists and it already has an ON … Read more
I’m looking for the different ways to map an enum using JPA. I especially want to set the integer value of each enum entry and to save only the integer value. @Entity @Table(name = “AUTHORITY_”) public class Authority implements Serializable { public enum Right { READ(100), WRITE(200), EDITOR (300); private int value; Right(int value) { … Read more
This question already has answers here: What is the easiest way to ignore a JPA field during persistence? (10 answers) Closed 5 years ago. I thought hibernate takes into consideration only class variables that are annotated with @Column. But strangely today when I added a variable (that is not mapped to any column, just a … Read more
I am using JPA in my project. I came to a query in which I need to make join operation on five tables. So I created a native query which returns five fields. Now I want to convert the result object to java POJO class which contains the same five Strings. Is there any way … Read more
