Foreign Key Hibernate Annotation

I can not manage to make this simple foreign key constraint work. @Entity @Table(name = “wheel”) @Data public class WheelEntity { @Id @Column(name = “id”) @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; … @Entity @Table(name = “bike”) @Data public class BikeEntity { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @ManyToOne(targetEntity = WheelEntity.class, fetch=FetchType.EAGER, cascade={CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}) … Continue reading “Foreign Key Hibernate Annotation”

Hibernate DELETE query Error Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gestcart.loanpersonrelation' doesn't exist

I have a problem whit Hibernate querys, i exccute a process to delete one row in te DDBB hibernate launch the follow error: Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert( at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert( at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert( at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert( at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract( at org.hibernate.loader.Loader.getResultSet( at org.hibernate.loader.Loader.executeQueryStatement( at org.hibernate.loader.Loader.executeQueryStatement( at org.hibernate.loader.Loader.doQuery( at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections( at org.hibernate.loader.Loader.doList( at org.hibernate.loader.Loader.doList( at … Continue reading “Hibernate DELETE query Error Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gestcart.loanpersonrelation' doesn't exist”

How to Delete and Modify Datas using Struts2 and Hibernate

I created a jsp page that shows me the list of doctors (medecin in french) contained in my mysql database via the hibernate framework and struts2 . I have a delete button supprimer (in french), to remove a doctor, and a button , modifier , to edit the doctor’s data . The edit button , … Continue reading “How to Delete and Modify Datas using Struts2 and Hibernate”

@ManyToOne hibernate mapping

How to prevent record insertion in @ManyToOne hibernate mapping. Their Parent table have no record. We tried to insert record without parent table primary key and still the record was inserted into child table Domain class Department Table(Parent) @Table(name = “Department”) @Entity public class Department { @Id @GenericGenerator(name = “g1”, strategy = “increment”) @GeneratedValue(generator = … Continue reading “@ManyToOne hibernate mapping”

Springboot Hibernate Entity Mapping

I have three tables with primary key in each table : table packetname, table customer, and table rent. Table PacketName public class PacketName implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy=GenerationType.AUTO) private Integer idpacket; private String packetname; private String packetdesc; private String packetprize; private String packettime; //getter and setter etc } … Continue reading “Springboot Hibernate Entity Mapping”

Entity update options in Spring/JPA

I have a Vehicle entity which has many attributes(around 30+ attributes). I am trying to understand what is the best way to update entities with a large number of field attributes. For example if a particular object(i.e. table row in the DB) like vehicle has to be updated with new values, what are the possible … Continue reading “Entity update options in Spring/JPA”

JPA Join Query using @Query in repository

I have two tables with composite primary keys and also it has foreign key relation ship. I am trying JPA mappings between these tables. We need to get the below join query result from JPA repository select * from A i inner join B n on = where = ‘XXX’ and i.version=99999; … Continue reading “JPA Join Query using @Query in repository”

No bean named 'entityManagerFactory' available but entityManagerFactoryRef is set

I’m trying to configure two H2 datasource. I tried dozen of tutorials but it still does not works. Now I have two configuration classes First, default configuration: @Configuration @EnableJpaRepositories( basePackages = “”, entityManagerFactoryRef = “defaultEntityManagerFactory”, transactionManagerRef = “defaultTransactionManager”) @EnableTransactionManagement public class DefaultJpaConfiguration { private final JpaVendorAdapter jpaVendorAdapter; public DefaultJpaConfiguration(JpaVendorAdapter jpaVendorAdapter) { this.jpaVendorAdapter = jpaVendorAdapter; } … Continue reading “No bean named 'entityManagerFactory' available but entityManagerFactoryRef is set”

Hibernate Configuration Mapping

I am new to spring mvc, I am writing a Crud operation through spring.But I am stuck with some exception which are caused in my Hibernate Configuration file. Below is exceptions listed. org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘hibernateConfiguration’: Unsatisfied dependency expressed through field ‘sessionfactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sessionFactory’ … Continue reading “Hibernate Configuration Mapping”

Using Hibernate entity manager but connection is not closed and memory is not release

I found out that em.close() and emf.close() are not closing the connection, seeing the memory is not resealed. There are two related posts about session, but not entity manager. How to force hibernate to release memory once the session is closed? Closing Hibernate Connection Is there any example that closing the connection in the correct … Continue reading “Using Hibernate entity manager but connection is not closed and memory is not release”