Hibernate example error message

[Mathew Lee]

Hi,

I am trying following hibernate example from link

http://www.vaannila.com/hibernate/hibernate-example/hibernate-mapping-many-to-one-using-annotations-1.html.

It is giving error as given below

   


log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.MappingException: Unknown entity: com.vaannila.student.Student
      at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
      at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
      at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:98)
      at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
      at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
      at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
      at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
      at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
      at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
      at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
      at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
      at com.vaannila.student.Main.main(Main.java:23)

 

My code looks like

Main.java file looks like this

    

package com.vaannila.student;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.vaannila.util.HibernateUtil;

public class Main {

      public static void main(String[] args) {
            Session session = HibernateUtil.getSessionFactory().openSession();
            Transaction transaction = null;
            try {
                  transaction = session.beginTransaction();
                  Address address = new Address("OMR Road", "Chennai", "TN", "600097");
                  // By using cascade=all option the address need not be saved
                  // explicitly when the student object is persisted the address will
                  // be automatically saved.
                  //session.save(address);
                  Student student1 = new Student("Eswar", address);
                  Student student2 = new Student("Joe", address);
                  session.save(student1);
                  session.save(student2);
                  transaction.commit();
            } catch (HibernateException e) {
                  transaction.rollback();
                  e.printStackTrace();
            } finally {
                  session.close();
            }

      }

}

 

Address.java looks like

    




package com.vaannila.student;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "ADDRESSANNOTATIONMANYONE")
public class Address {

      private long addressId;
      private String street;
      private String city;
      private String state;
      private String zipcode;

      public Address() {
      }

      public Address(String street, String city, String state, String zipcode) {
            this.street = street;
            this.city = city;
            this.state = state;
            this.zipcode = zipcode;
      }

      @Id
      @GeneratedValue
      @Column(name = "ADDRESS_ID")
      public long getAddressId() {
            return this.addressId;
      }

      public void setAddressId(long addressId) {
            this.addressId = addressId;
      }
      
      @Column(name = "ADDRESS_STREET", nullable = false, length=250)
      public String getStreet() {
            return this.street;
      }

      public void setStreet(String street) {
            this.street = street;
      }

      @Column(name = "ADDRESS_CITY", nullable = false, length=50)
      public String getCity() {
            return this.city;
      }

      public void setCity(String city) {
            this.city = city;
      }

      @Column(name = "ADDRESS_STATE", nullable = false, length=50)
      public String getState() {
            return this.state;
      }

      public void setState(String state) {
            this.state = state;
      }

      @Column(name = "ADDRESS_ZIPCODE", nullable = false, length=10)
      public String getZipcode() {
            return this.zipcode;
      }

      public void setZipcode(String zipcode) {
            this.zipcode = zipcode;
      }

}

 

student.java looks like

    


package com.vaannila.student;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name = "STUDENTANNOTATIONMANYONE")
public class Student {

      private long studentId;
      private String studentName;
      private Address studentAddress;

      public Student() {
      }

      public Student(String studentName, Address studentAddress) {
            this.studentName = studentName;
            this.studentAddress = studentAddress;
      }

      @Id
      @GeneratedValue
      @Column(name = "STUDENT_ID")
      public long getStudentId() {
            return this.studentId;
      }

      public void setStudentId(long studentId) {
            this.studentId = studentId;
      }

      @Column(name = "STUDENT_NAME", nullable = false, length = 100)
      public String getStudentName() {
            return this.studentName;
      }

      public void setStudentName(String studentName) {
            this.studentName = studentName;
      }

      @ManyToOne(cascade = CascadeType.ALL)
      public Address getStudentAddress() {
            return this.studentAddress;
      }

      public void setStudentAddress(Address studentAddress) {
            this.studentAddress = studentAddress;
      }

}

 

hibernmate.cfg file looks like

    




<?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>
<!-- Database connection settings -->
  <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
      <property name="connection.username">deliverytest7</property>
<property name="connection.password">dbpassword</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>



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

How can i resolve this issue. Any ideas, suggestions, resources, links highly appreciated. Thanks in advance

[Wouter Oet]

You forgot to declare the mappings in hibernate.cfg.xml

[Mathew Lee]

Thank you very much.