CODEWITHSUNDEEP
javamysqlsqlhibernate
LinhSaysHi
LinhSaysHi

Reputation: 642

Exception in thread "main" org.hibernate.MappingException: Unknown entity

Going through the "Introduction to Hibernate" tutorials on PluralSight. I have this exception error. The full error being:

Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.simpleprogrammer.User
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)
    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1451)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:100)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:678)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:670)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:665)
    at com.simpleprogrammer.Program.main(Program.java:15)

Not sure what is wrong. I created the User.java pojo. I created a the table that matched the pojo. I created the mapping and then added the mapping to the hibernate.cfg.xml file. However, still getting the error. Can anyone help me through this?

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
                                         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
 <session-factory name="">
  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost:3306</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.default_schema">protein_tracker</property>
  <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
  <mapping class="com.simpleprogrammer.User" resource="com/simpleprogrammer/User.hbm.xml"/>
 </session-factory>
</hibernate-configuration>

Program.java

public class Program {
    public static void main(String[] args) {
        System.out.println("Hello World!");
        Session session = HibernateUtilities.getSessionFactory().openSession();
        session.beginTransaction();

        User user = new User();
        user.setName("Joe");
        user.setGoal(250);
        session.save(user);

        session.getTransaction().commit();
        session.close();
        HibernateUtilities.getSessionFactory().close();
    }
}

User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Oct 17, 2015 11:44:47 AM by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.simpleprogrammer.User" table="USERS">
        <id name="id" type="int">
            <column name="ID" />
            <generator class="identity" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>
        <property name="total" type="int">
            <column name="TOTAL" />
        </property>
        <property name="goal" type="int">
            <column name="GOAL" />
        </property>
    </class>
</hibernate-mapping>

User.java

package com.simpleprogrammer;

public class User {
    private int id;
    private String name;
    private int total;
    private int goal;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getTotal() {
        return total;
    }
    public void setTotal(int total) {
        this.total = total;
    }
    public int getGoal() {
        return goal;
    }
    public void setGoal(int goal) {
        this.goal = goal;
    }
}

HibernateUtilities.java

package com.simpleprogrammer;

import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtilities {

    private static SessionFactory sessionFactory;
    private static ServiceRegistry serviceRegistry;

    static {
        try {
            Configuration configuration = new Configuration().configure();

            serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        }
        catch(HibernateException exception) {
            System.out.println("Problem creating session factory!");
        }   
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}

Upvotes: 1

Views: 17364

Answers (12)

Srinivas Gurrapu
Srinivas Gurrapu

Reputation: 1

Use

Configuration.addAnnotatedClass(com.simpleprogrammer.User);

Upvotes: 0

MOHIT AGARWAL
MOHIT AGARWAL

Reputation: 1

I faced the same problem what fixed my problem is I used method .addAnnotatedClass("ClassName".class) Example:

SessionFactory factory = new Configuration()
    .configure()
    .addAnnotatedClass(Students.class)
    .buildSessionFactory();

Upvotes: 0

Nandhini Nadar
Nandhini Nadar

Reputation: 1

for this issue the simple solution is to make sure that, you need to update correctly in cfg.xml file 1.mapping should be done correctly as package.className. 2.Make sure you make th pojo class as @Entity

Upvotes: 0

Harshana Jayaweera
Harshana Jayaweera

Reputation: 11

Try this method for this problem:

  1. In Entity Class use the annotations like this Annotations
  2. Make Sure That FactoryConfiguration class is like this FactoryConfiguration Class

Upvotes: 0

Minakshi Suresh
Minakshi Suresh

Reputation: 1

The easy solution is, when you create SessionFactory object, just check your HibernateUtil class which you have created. Write correct hibernateUtility class and import correct package. If you have created multiple src packages in single project then keep packages name for hibernateutility class different.

Upvotes: 0

Manish
Manish

Reputation: 1

there is problem with Hibernate jars... here i can see u are using the Hibernate 4....for developing the project... so add the hibernate 4.3.5 jar it should work.........

if u are not working with metadata than better to use hibernate 4.3 jar

Upvotes: 0

ABODE
ABODE

Reputation: 1018

The mapping is having a little issue. Make sure the path you specified is correct. When i had same issue, i only re-modified my mapping in the hibernate.cfg.xml to

<mapping class="com.simpleprogrammer.User"/>

Other attribute like resource were not added

Upvotes: 1

kanwar prince raghav
kanwar prince raghav

Reputation: 31

Change the code as per Hibernate 5

    static
    {
        try {
            //Configuration configuration = new Configuration().configure();
            serviceRegistry = new 
            StandardServiceRegistryBuilder().configure("hibernate.cfg.xml")
                                        .build();
            Metadata metadata = new MetadataSources(serviceRegistry)
                                .getMetadataBuilder().build();
            sessionFactory = metadata.getSessionFactoryBuilder().build();   
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
    public static SessionFactory getSessionFactory() {
    return sessionFactory;
    }

give the give full class path in user.hbm.xml

     <class name="com.simpleprogrammer.Users" table="USERS">

map the resource in hibernate.cfg.xml

      <mapping resource="com/simpleprogrammer/Users.hbm.xml"/>

and execute the following code

    Session session = HibernateUtilities.getSessionFactory().openSession();

    session.beginTransaction();

    Users user = new Users();

    user.setuserName("Prince");
    user.setGoal(100);
    user.setId(101);
    user.setTotal(10);

    session.save(user);

    session.getTransaction().commit(); 
    session.close();
    HibernateUtilities.getSessionFactory().close();

Upvotes: 2

Deepak
Deepak

Reputation: 71

I also faced the same error while trying it out with Hibernate 5.1.1. But I resolved it by replacing ServiceRegistry interface with StandardServiceRegistryBuilder and used "metadatasources" to create session factory. Please see my code below

static
{
    try
    {
        //Configuration configuration = new Configuration().configure();
        standardServiceRegistry = new StandardServiceRegistryBuilder().configure("hibernate.cfg.xml")
                                    .build();
        Metadata metadata = new MetadataSources(standardServiceRegistry)
                                .getMetadataBuilder().build();
        sessionFactory = metadata.getSessionFactoryBuilder().build();

    }catch(HibernateException exception)
    {
        System.out.println("problem creating session factory!");
    }
}

public static SessionFactory getSessionFactory(){

    return sessionFactory;
}

I made these changes and it worked like a charm. please make changes in your code to the way you load the configuration file and try it again. Let me know if you still face hurdles.

Upvotes: 7

ThCollignon
ThCollignon

Reputation: 1214

LinhSaysHi, I've executed your code with Hibernate 5 and I have the exact same error. I've executed it with Hibernate 4 and there is no problem.

The tutorial on Pluralsight has been created for Hibernate 4. Here is a session factory builder that works with Hibernate 5:

public class HibernateUtilities_5 {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
                    .configure("hibernate.cfg.xml").build();
            Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().build();
            return metadata.getSessionFactoryBuilder().build();

        } catch (HibernateException he) {
            System.out.println("Session Factory creation failure");
            throw he;
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}

Upvotes: 16

user5528931
user5528931

Reputation: 21

Please check the schema name that you created in MySQL and the one specied in hibernate.cfg file.It was mismatching for me and i was getting same issue.

Also modify connection url like below and remove the default schema field from hibernate.cfg. jdbc:mysql://localhost:3306/protein_tracker

this worked for me.

Upvotes: 2

johncus
johncus

Reputation: 51

I used your example and was able to get it to work with a few minor tweaks.

Verified that User.hbm.xml was located in src/main/resources/com/simpleprogrammer. Changed to lowercase table="users"

Then in hibernate.cfg.xml:

  1. removed the name="" attribute from session-factory.
  2. added a <property name="hibernate.connection.password">SomePassword</property>
  3. added <property name="hibernate.hbm2ddl.auto">create</property>

Upvotes: 0

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