I tried to write some code with EntityManager but hibernate was updated to hibernate-core(6.0.0.Final) and with new hibernate 6.0 my old codes doesn't work

There my code: my pom.xml enter image description here

my persistence.xml file

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
         http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
         version="2.1">

<persistence-unit name="CRM">

    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

    <exclude-unlisted-classes>false</exclude-unlisted-classes>

    <properties>
        <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
        <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5678/postgres"/>
        <property name="hibernate.connection.username" value="postgres"/>
        <property name="hibernate.connection.password" value="postgres"/>
        <property name="hibernate.hbm2ddl.auto" value="create"/>
        <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
        <property name="hibernate.show_sql" value="true"/>
    </properties>
</persistence-unit>

and my main method

        EntityManagerFactory entityManagerFactory =
            Persistence.createEntityManagerFactory("CRM");

    EntityManager entityManager = entityManagerFactory.createEntityManager();

    entityManager.getTransaction().begin();

    entityManager.persist(new SuperHero());

    entityManager.getTransaction().commit();

    entityManager.close();

    entityManagerFactory.close();

here result

enter image description here

thanks in advance for your help

CodePudding user response：

It looks as if you are mixing 2 incompatible versions of Hibernate resources:

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>6.0.0.Final</version>
</dependency>

and:

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>5.6.7.Final</version>
</dependency>

From v6 onwards, the Hibernate libraries have moved from using Java Persistence to Jakarta Persistence. You can read about this larger Java ecosystem change elsewhere Transition from Java EE to Jakarta EE - and also in other SO questions and answers.

By including a Hibernate Entity Manager v5 dependency, your project will still be referring to a Java Persistence library (e.g. via javax.persistence-api-2.2.jar or similar). This means your code may still compile - but, as you see, it will not execute. You will see error messages referring to javax classes, which are no longer supported by the v6 Hibernate Core library.

Furthermore, Hibernate's JPA support has been merged into the hibernate-core module, making the hibernate-entitymanager module obsolete. You can see a note about this by looking at the readme.txt file in your Entity Manager 5.6.7 JAR file:

Hibernate's JPA support has been merged into the hibernate-core module, making this hibernate-entitymanager module obsolete. This module will be removed in Hibernate ORM 6.0.

Recommended steps:

1. Remove the hibernate-entitymanager dependency from your POM. That will probably trigger a series of compilation errors, because you will no longer have any library support for classes such as javax.persistence.EntityManager.

2. Update all your javax imports to jakarta imports. So, for example, taking the class from (1) above, that becomes:

import jakarta.persistence.EntityManager;

3. In your persistence.xml file you will also need to fix any similar references to javax - for example:

<property name="jakarta.persistence.jdbc.driver" 
          value="com.mysql.jdbc.Driver" />

Final Notes

If you still face issues following the above steps, then you can refer to the official Hibernate ORM 6.0 Migration Guide.