The EntityManager interface belongs to JPA and is implemented by JPA providers (such as Eclipse), not Spring, and it has its own injection annotation: @PersistenceContext. EntityManager objects are transaction-scoped and should not be exposed as beans as you’re doing. Instead, either use the JPA annotation to inject the EntityManager: @PersistenceContext EntityManager em; or, since it … Read more
All database statements are executed within the context of a physical transaction, even when we don’t explicitly declare transaction boundaries (BEGIN/COMMIT/ROLLBACK). If you don’t declare the transaction boundaries, then each statement will have to be executed in a separate transaction. This may even lead to opening and closing one connection per statement. Declaring a service … Read more
@Size is a Bean Validation annotation that validates that the associated String has a value whose length is bounded by the minimum and maximum values. And as your exception says it does not apply to Integer type. Use: @Range @Column(name= “discount_percentage”) @Range(min=0, max=90) private Integer discountPercentage = 0; Or you cloud also use only @Max … Read more
Not only in DAO design pattern but in other design patterns also use of INTERFACE is bit confusing. Interfaces is one of the best used concepts in Java. Let me explain this with an example: Say you designed a GPS device for car which looks into the map and automatically turns the car to the … Read more
I think it means you’re trying to use the IDENTITY ID generator with a table column which is not properly configured. It should be an auto_increment column for the IDENTITY generator to work. Else, the database doesn’t return any generated ID.
You can map your discriminator as a read-only property: public class ApplicationProcess { … @Column(name = “apType”, insertable = false, updatable = false) private String apType; }
The error comes from JpaTransactionManager line 403: TransactionSynchronizationManager.bindResource(getDataSource(), conHolder); The error means that the transaction manager is trying to bind the datasource (not the entity manager) to the thread, but the datasource is already there and this is unexpected. Note that the transaction manager had not started yet to bind the Entity Manager to the … Read more
For those who are wondering what’s the alternative approach with hibernate 6, you have to change this from: @Type(type = “org.hibernate.type.NumericBooleanType”) private Boolean debug = false; to this: @Convert(converter = org.hibernate.type.NumericBooleanConverter.class) private Boolean debug = false; Refer – https://docs.jboss.org/hibernate/orm/6.0/userguide/html_single/Hibernate_User_Guide.html#basic-boolean
for future googlers! finally i managed to solve the problem, i just had to put the annotations somewhere else in my code , @ElementCollection(targetClass = Days.class) @CollectionTable(name = “days”, joinColumns = @JoinColumn(name = “rule_id”)) @Column(name = “daysOfWeek”, nullable = false) @Enumerated(EnumType.STRING) public Set<Days> getDays() { return days; } as you can see i wrote the … Read more
session.refresh(entity) or entityManager.refresh(entity) (if you use JPA) will give you fresh data from DB.