org.hibernate.MappingException: Unknown entity: com.training.HelloWorld

[Kaustubh G Sharma]

Hello I tried to run a hibernate 2 example but getting org.hibernate.MappingException: Unknown entity: com.training.HelloWorld ... Please help. Can see my code below

package com.training;

import java.io.Serializable;

public class HelloWorld implements Serializable{

	private long id;
	private String text;
	public long getId() {
		return id;
	}
	public void setId(long id) {
		this.id = id;
	}
	public String getText() {
		return text;
	}
	public void setText(String text) {
		this.text = text;
	}
	
	
	
}

package com.training;

import java.util.Iterator;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class TestHelloWorld {
	
	public static void main(String[] args) {
		Session session = null;

		try{
			// This step will read hibernate.cfg.xml and prepare hibernate for use
			//SessionFactory sessionFactory = new AnnotationConfiguration().configure("hibernate_helloWorld_Annotation.cfg.xml").buildSessionFactory();
			SessionFactory sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
			 session =sessionFactory.openSession();             
			 Transaction tx = session.beginTransaction();
				//Create new instance of Contact and set values in it by reading them from form object
			 	HelloWorld helloWorld = new HelloWorld();
			 	helloWorld.setId(1);
			 	helloWorld.setText("Hello World!");
				session.save(helloWorld);
				helloWorld = (HelloWorld)session.get(HelloWorld.class, new Long(1));
				//tx.commit();
				
				System.out.println("DAta is :"+helloWorld.getText());

		}catch(Exception e){
			e.printStackTrace();
			System.out.println(e.getMessage());
		}finally{
			// Actual contact insertion will happen at this step
			System.out.println("test");
			 session.flush();
			 session.close();
			}
		
	}


}

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

<hibernate-configuration>
<session-factory>

		<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
     <!--  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="hibernate.connection.url">jdbc:mysql://localhost/hibernatetutorial</property>
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
       -->
       <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>	
      <property name="hibernate.connection.username">SYSTEM</property>
      <property name="hibernate.connection.password">root</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="show_sql">true</property>
      <property name="connection.autocommit">true</property>
      <property name="dialect">org.hibernate.dialect.OracleDialect</property>
      
      
     <property name="hibernate.hbm2ddl.auto">create</property>
    
       <mapping class="com.training.HelloWorld"/>
       
  
     
</session-factory>
</hibernate-configuration>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="com.nihilent.training.HelloWorld" table="HELLOWORLD">
	   <id name="id" type="long" column="ID" >
	   <generator class="assigned"/>
	  </id>
	  <property name="text">
		 <column name="TEXT" />
	  </property>
   </class>
   
    
</hibernate-mapping>

[T Mishra]

Inconsistent package

<mapping class="com.training.HelloWorld"/>  

<class name="com.nihilent.training.HelloWorld" table="HELLOWORLD"> 

[Kaustubh G Sharma]

T Mishra wrote:Inconsistent package

<mapping class="com.training.HelloWorld"/>  

<class name="com.nihilent.training.HelloWorld" table="HELLOWORLD"> 

Package is right in my code just forget to made change here. but still having issues with it.

[T Mishra]

Replace

<mapping class="com.training.HelloWorld"/>

by

<mapping resource="path/to/.hbm.xml"/>

an example xml configuration

[Kaustubh G Sharma]

T Mishra wrote:Replace

<mapping class="com.training.HelloWorld"/>

by

<mapping resource="path/to/.hbm.xml"/>

an example xml configuration

Getting

log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
org.hibernate.MappingNotFoundException: resource: path/to/.hbm.xml not found
	at org.hibernate.cfg.Configuration.addResource(Configuration.java:769)
	at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2314)
	at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2280)
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2260)
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2213)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:2128)
	at com.nihilent.training.TestHelloWorld.main(TestHelloWorld.java:20)
Exception in thread "main" java.lang.NullPointerException
	at com.nihilent.training.TestHelloWorld.main(TestHelloWorld.java:39)
resource: path/to/.hbm.xml not found
test

[T Mishra]

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="com.nihilent.training.HelloWorld" table="HELLOWORLD">
	   <id name="id" type="long" column="ID" >
	   <generator class="assigned"/>
	  </id>
	  <property name="text">
		 <column name="TEXT" />
	  </property>
   </class>
</hibernate-mapping>

Assuming the name of the above file is HelloWorld.hbm.xml.

path/to/.hbm.xml

you have to specify path to the HelloWorld.hbm.xml.

[Kaustubh G Sharma]

the same code was working during tutorial but not on my system. is there any particular configuration required for it?

[Kaustubh G Sharma]

Kaustubh G Sharma wrote:
Hello I tried to run a hibernate 2 example but getting org.hibernate.MappingException: Unknown entity: com.training.HelloWorld ... Please help. Can see my code below

package com.training;

import java.io.Serializable;

public class HelloWorld implements Serializable{

	private long id;
	private String text;
	public long getId() {
		return id;
	}
	public void setId(long id) {
		this.id = id;
	}
	public String getText() {
		return text;
	}
	public void setText(String text) {
		this.text = text;
	}
	
	
	
}

package com.training;

import java.util.Iterator;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class TestHelloWorld {
	
	public static void main(String[] args) {
		Session session = null;

		try{
			// This step will read hibernate.cfg.xml and prepare hibernate for use
			//SessionFactory sessionFactory = new AnnotationConfiguration().configure("hibernate_helloWorld_Annotation.cfg.xml").buildSessionFactory();
			SessionFactory sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
			 session =sessionFactory.openSession();             
			 Transaction tx = session.beginTransaction();
				//Create new instance of Contact and set values in it by reading them from form object
			 	HelloWorld helloWorld = new HelloWorld();
			 	helloWorld.setId(1);
			 	helloWorld.setText("Hello World!");
				session.save(helloWorld);
				helloWorld = (HelloWorld)session.get(HelloWorld.class, new Long(1));
				//tx.commit();
				
				System.out.println("DAta is :"+helloWorld.getText());

		}catch(Exception e){
			e.printStackTrace();
			System.out.println(e.getMessage());
		}finally{
			// Actual contact insertion will happen at this step
			System.out.println("test");
			 session.flush();
			 session.close();
			}
		
	}


}

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

<hibernate-configuration>
<session-factory>

		<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
     <!--  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="hibernate.connection.url">jdbc:mysql://localhost/hibernatetutorial</property>
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
       -->
       <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>	
      <property name="hibernate.connection.username">SYSTEM</property>
      <property name="hibernate.connection.password">root</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="show_sql">true</property>
      <property name="connection.autocommit">true</property>
      <property name="dialect">org.hibernate.dialect.OracleDialect</property>
      
      
     <property name="hibernate.hbm2ddl.auto">create</property>
    
       <mapping class="com.training.HelloWorld"/>
       
  
     
</session-factory>
</hibernate-configuration>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="com.nihilent.training.HelloWorld" table="HELLOWORLD">
	   <id name="id" type="long" column="ID" >
	   <generator class="assigned"/>
	  </id>
	  <property name="text">
		 <column name="TEXT" />
	  </property>
   </class>
   
    
</hibernate-mapping>