Question

I want to use Configuration() methot. But I get this error:

Initial SessionFactory creation failed.org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="com.example.domain.Lesson"/>

If I use AnnotationConfiguratin() method, Hibernate can read my classes. I don’t understand this:

Why when I use Configuration method, Hibernate can’t see <mapping class="com.example.Lesson"/> definition?

My hibernate.cfg.xml file :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>

        <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
        <property name="hibernate.connection.password">****</property>
        <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/DB</property>
        <property name="hibernate.connection.username">postgres</property>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>   

        <mapping resource="com.example/Lesson.hbm.xml" /> 

        <mapping class="com.example.Lesson"/>


    </session-factory>
</hibernate-configuration>

My Lesson class :

    public class Lesson implements java.io.Serializable {

        private int id;
        private String lesson;
        private Set lessons = new HashSet(0);

        public Lesson() {
        }


        public Lesson(int id, String lesson, Set lessons) {
            this.id = id;
            this.id = id;
            this.lessons = lessons;
        }


        continue..



}

I had bhm.xml files from reverse engineering. So, I don’t want to use Annotation.

Any idea?

Answer 1

Just remove <mapping class="com.example.Lesson"/> from hibernate.cfg.xml. It is not necessary because Lesson.hbm.xml is present.