Sunday, March 20, 2011

Hibernate Tutorial for Beginners



Hibernate is an Object/ Relational Mapping solution for Java environments. It reduces the development cost by reducing paradigm mismatch between how data is represented in objects versus relational databases.

Hibernate takes care of the mapping from Java classes to database tables and provides data query and retrieval facilities. This tutorial is designed for the beginners of Hibernate and expects you to have some knowledge about Java and SQL. I’m going to use MySQL database and Eclipse IDE in this tutorial.

By following this tutorial you will get the knowledge of;

1. Setup the Development Environment for Hibernate
2. Create POJO Classes
3. Create Mapping Files
4. Hibernate Configuration
5. Create Startup Helper Class
6. Create Test Class to Load and Store Objects


Let's start.

1. Setup the Development Environment for Hibernate

First you need to set up the development environment. Following things are needed if you want to try Hibernate with MySQL using Eclipse IDE.

1. Hibernate distribution bundle – Download
2. MySQL installed in your Computer – Download
3. JDBC driver for MySQL – Download
4. slf4j logging backend – Download
5. Eclipse IDE – Download

1.1 Setup the Database

I'm going to use simple database named "userdata" which has two tables named "users" and "tasks". Figure 1 illustrates the structure of the database and there "id" column is the Primary Key of both tables and it is set to AUTO_INCREMENT.


1.2 Create New Project

In this tutorial I’m going to show how to Retrieve, Add, Delete and Update data in a MySQL database. There I’ll create simple Java Project and you can use this tutorial to create web applications too.

First create new project in Eclipse using appropriate name, I’ll give "MyFirstHibernateApp".


You need to manually account for all the needed dependencies, so let’s create new folder called "lib" inside the "MyFirstHibernateApp" by right clicking on it as shown in following Figure 3.


Now copy following files into that folder.
1. hibernate3.jar (Can be found in distribution bundle)
2. All artifacts in the lib/required directory in distribution bundle
3. All artifacts in the lib/jpa directory in distribution bundle
4. All files from either the lib/bytecode/cglib or lib/bytecode/javassist directory
5. One of the slf4j logging (I'll use slf4j-simple-1.6.1.jar found inside slf4j-1.6.1.zip)
6. mysql-connector-java-5.1.15-bin.jar (JDBC driver for MySQL )

Then you can configure the built path. To do that, right click on project "MyFirstHibernateApp" in Package Explorer and select Build Path --> Configure Build Path... Then go to Libraries tab and browse lib folder you created earlier. Then add external jars by selecting all jar files that you copied to lib folder in one of previous step. (Check Figure 4).


Now you will be able to see the referenced libraries as follow (Figure 5).


2. Create POJO Classes

Next, I'll create two classes that represent the user and task we want to store in the database. Those are simple JavaBean classes with some properties which uses standard JavaBean naming conventions for property getter and setter methods and private visibility for the fields.

To create new class right click on "MyFirstHibernateApp" and select New --> Class. Then give appropriate package name, I’ll give "com.hib" as figure 6. You can generate getter and setters easily by selecting variable declaration and selecting Source --> Generate Getters and Setters…


User Class
package com.hib;

public class User {
 private Integer id;
 private String firstName;
 private String lastName;
 
 public Integer getId() {
  return id;
 }
 public void setId(Integer id) {
  this.id = id;
 }
 public String getFirstName() {
  return firstName;
 }
 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }
 public String getLastName() {
  return lastName;
 }
 public void setLastName(String lastName) {
  this.lastName = lastName;
 }
}
Task Class
package com.hib;

public class Task {

 private Integer id;
 private Integer userID;
 private String title;
 private String description;
 
 public Integer getId() {
  return id;
 }
 public void setId(Integer id) {
  this.id = id;
 }
 public Integer getUserID() {
  return userID;
 }
 public void setUserID(Integer userID) {
  this.userID = userID;
 }
 public String getTitle() {
  return title;
 }
 public void setTitle(String title) {
  this.title = title;
 }
 public String getDescription() {
  return description;
 }
 public void setDescription(String description) {
  this.description = description;
 }
}
The id property holds a unique identifier value for a particular user and task. All persistent entity classes will need such an identifier property if you want to use the full feature set of Hibernate.

3. Create Mapping Files

Hibernate needs to know how to load and store objects of the persistent class. This is where the Hibernate mapping file comes into play. The mapping file tells Hibernate what table in the database it has to access, and what columns in that table it should use.

Right click on the "src" folder and select New --> File and paste following code there. Save it as 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">

<hibernate-mapping>
 <class name="com.hib.User" table="users" >
  <id name="id" type="int" column="id" >
   <generator class="native"/>
  </id>

  <property name="firstName">
   <column name="first_name" />
  </property>
  <property name="lastName">
   <column name="last_name"/>
  </property>
 </class>
</hibernate-mapping>
Tasks.java should also have a mapping file, so create another file and paste following code. Save it as task.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">

<hibernate-mapping>
 <class name="com.hib.Task" table="tasks">
  <id name="id" type="int" column="id" >
   <generator class="native"/>
  </id>

  <property name="userID">
   <column name="user_id" />
  </property>  
  <property name="title">
   <column name="title" />
  </property>
  <property name="description">
   <column name="description"/>
  </property>
 </class>
</hibernate-mapping>
In the above mapping file you can see the mapping of the unique identifier property to the tables primary key. As we do not want to care about handling this identifier, we configure Hibernate's identifier generation strategy for a surrogate primary key column by giving class="native". If it is not AUTO_INCREMENT one we should use class="assign".

The id element is the declaration of the identifier property. The name="id" mapping attribute declares the name of the JavaBean property and tells Hibernate to use the getId() and setId() methods to access the property. The column attribute tells Hibernate which column of the "users" and "tasks" tables holds the primary key value. Similar to the id element, the name attribute of the property element tells Hibernate which getter and setter methods to use.

4. Hibernate Configuration

Now you have the persistent class and its mapping file in place. Let’s configure Hibernate.

Right click on the "src" folder and select New --> File and paste following code there. Save it as hibernate.cfg.xml. Here you have to give the username and password according to your MySQL account. In my case username is root and there is no password.
<?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>
  <!-- Database connection settings -->
  <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
  <property name="connection.url">jdbc:mysql://localhost/userdata</property>
  <property name="connection.username">root</property>
  <property name="connection.password"></property>
  
  <!-- JDBC connection pool (use the built-in) -->
  <property name="connection.pool_size">1</property>
  
  <!-- SQL dialect -->
  <property name="dialect">org.hibernate.dialect.MySQLDialect</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>
  
  <!-- Mapping files -->
  <mapping resource="user.hbm.xml"/>
  <mapping resource="task.hbm.xml"/>
  
 </session-factory>
</hibernate-configuration>
5. Create Startup Helper Class

You have to startup Hibernate by creating a global org.hibernate.SessionFactory object and storing it somewhere for easy access in your application code. A org.hibernate.SessionFactory is used to obtain org.hibernate.Session instances. A org.hibernate.Session represents a single-threaded unit of work. The org.hibernate.SessionFactory is a thread-safe global object that is instantiated once. We will create a HibernateUtil helper class that takes care of startup and makes accessing the org.hibernate.SessionFactory more convenient.

To create new class right click on "com.hib" package and select New --> Class and give Name as HibernateUtil.java and paste the following code in class file.
package com.hib;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
 private static final SessionFactory sessionFactory = buildSessionFactory();
 private static SessionFactory buildSessionFactory() {
  try {
   // Create the SessionFactory from hibernate.cfg.xml
   return new Configuration().configure().buildSessionFactory();
  }
  catch (Throwable ex) {
   // Make sure you log the exception, as it might be swallowed
   System.err.println("Initial SessionFactory creation failed." + ex);
   throw new ExceptionInInitializerError(ex);
  }
 }
 public static SessionFactory getSessionFactory() {
  return sessionFactory;
 }
}
6. Create Test Class to Load and Store Objects

Now it’s time to do some real work using Hibernate. Following test class illustrate how we can Add, Retrieve, Update and Delete data in a MySQL database.

To create new class right click on "com.hib" package and select New --> Class and give Name as Test.java and paste the following code in class file.
package com.hib;

import java.util.Iterator;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class Test {

 /**
  * @param args
  */
 public static void main(String[] args) {
  
  Test tst = new Test();
  
  /**
   * adding records 
   */
  tst.addUser("Saranga", "Rath");
  tst.addUser("Isuru", "Sampath");
  tst.addUser("Saranga", "Jaya");
  tst.addUser("Prasanna", "Milinda");
  
  tst.addTask(1, "Call", "Call Pubudu at 5 PM");
  tst.addTask(1, "Shopping", "Buy some foods for Kity"); 
  tst.addTask(2, "Email", "Send birthday wish to Pubudu"); 
  tst.addTask(2, "SMS", "Send message to Dad"); 
  tst.addTask(2, "Office", "Give a call to Boss");
  
  /**
   *  retrieving data 
   */
  tst.getFullName("Saranga");
  
  /** 
   * full updating records 
   */
  User user = new User();
  user.setId(1);
  user.setFirstName("Saranga");
  user.setLastName("Rathnayake");
  tst.updateUser(user);
  
  /**
   * partial updating records 
   */
  tst.updateLastName(3, "Jayamaha");

  /** 
   * deleting records 
   */
  User user1 = new User();
  user1.setId(4);
  tst.deleteUser(user1);
 }

 private void addUser(String firstName, String lastName) {
  
  Transaction trns = null;
  Session session = HibernateUtil.getSessionFactory().openSession();
  try {
   trns = session.beginTransaction();
   
   User user = new User();
   
   user.setFirstName(firstName);
   user.setLastName(lastName);
   
   session.save(user);
   
   session.getTransaction().commit();
  } catch (RuntimeException e) {
   if(trns != null){
    trns.rollback();
   }
   e.printStackTrace();
  } finally{
   session.flush();
   session.close();
  } 
 }

 private void addTask(int userID, String title, String description) {
  
  Transaction trns = null;
  Session session = HibernateUtil.getSessionFactory().openSession();
  try {
   trns = session.beginTransaction();
   
   Task task = new Task();
   
   task.setUserID(userID);
   task.setTitle(title);
   task.setDescription(description);
   
   session.save(task);
   
   session.getTransaction().commit();
  } catch (RuntimeException e) {
   if(trns != null){
    trns.rollback();
   }
   e.printStackTrace();
  } finally{
   session.flush();
   session.close();
  } 
 }
 
 private void updateLastName(int id, String lastName) {
  Transaction trns = null;
  Session session = HibernateUtil.getSessionFactory().openSession();
  try {
   trns = session.beginTransaction();
   String hqlUpdate = "update User u set u.lastName = :newLastName where u.id = :oldId";
   int updatedEntities = session.createQuery( hqlUpdate )
   .setString( "newLastName", lastName )
   .setInteger( "oldId", id )
   .executeUpdate();

   trns.commit();
  } catch (RuntimeException e) {
   if(trns != null){
    trns.rollback();
   }
   e.printStackTrace();
  } finally{
   session.flush();
   session.close();
  }
  
 }

 private void updateUser(User user) {
  Transaction trns = null;
  Session session = HibernateUtil.getSessionFactory().openSession();
  try {
   trns = session.beginTransaction();
   
   session.update(user);

   session.getTransaction().commit();
  } catch (RuntimeException e) {
   if(trns != null){
    trns.rollback();
   }
   e.printStackTrace();
  } finally{
   session.flush();
   session.close();
  }
 } 

 private void getFullName(String firstName) {
  Transaction trns = null;
  Session session = HibernateUtil.getSessionFactory().openSession();
  try {
   trns = session.beginTransaction();
   List<User> users = session.createQuery("from User as u where u.firstName = :firstName")
   .setString( "firstName", firstName )
   .list();
   for (Iterator<User> iter = users.iterator(); iter.hasNext();) {
    User user = iter.next();
    System.out.println(user.getFirstName() +" " + user.getLastName());
   }
   trns.commit();
  } catch (RuntimeException e) {
   if(trns != null){
    trns.rollback();
   }
   e.printStackTrace();
  } finally{
   session.flush();
   session.close();
  } 
 } 
 
 private void deleteUser(User user) {
  Transaction trns = null;
  Session session = HibernateUtil.getSessionFactory().openSession();
  try {
   trns = session.beginTransaction();
   
   session.delete(user);

   session.getTransaction().commit();
  } catch (RuntimeException e) {
   if(trns != null){
    trns.rollback();
   }
   e.printStackTrace();
  } finally{
   session.flush();
   session.close();
  }
 } 
}
If you have setup the database and followed the above steps correctly you should get following output.
Hibernate: insert into users (first_name, last_name) values (?, ?)
Hibernate: insert into users (first_name, last_name) values (?, ?)
Hibernate: insert into users (first_name, last_name) values (?, ?)
Hibernate: insert into users (first_name, last_name) values (?, ?)
Hibernate: insert into tasks (user_id, title, description) values (?, ?, ?)
Hibernate: insert into tasks (user_id, title, description) values (?, ?, ?)
Hibernate: insert into tasks (user_id, title, description) values (?, ?, ?)
Hibernate: insert into tasks (user_id, title, description) values (?, ?, ?)
Hibernate: insert into tasks (user_id, title, description) values (?, ?, ?)
Hibernate: select user0_.id as id0_, user0_.first_name as first2_0_, user0_.last_name as last3_0_ from users user0_ where user0_.first_name=?
Saranga Rath
Saranga Jaya
Hibernate: update users set first_name=?, last_name=? where id=?
Hibernate: update users set last_name=? where id=?
Hibernate: delete from users where id=?
Hibernate use Hibernate Query Language (HQL) which is powerful than SQL and fully object-oriented. You can get good knowledge about HQL by following HQL Documentation.

I have included the source files of this tutorial with the database. You can download it from here (Password : sara).

67 comments:

  1. Nice Article.....

    I'm novel to Hibernate & your post gain me lot of practical knowledge in Hibernate...

    I found another article named Introduction to Hibernate which gain the theoritical knowlegde for begginers.....

    ReplyDelete
  2. Great Tutorial.
    Searched internet for two weeks but was unable to run hibernate using other tutorials but your tutorial got me up and running in just an hour . Thanks
    really great tutorial for beginners . I'd highly appreciate to see a post from you for "Integrating Jasypt with Hibernate 3" .

    ReplyDelete
  3. @ Anonymous,
    Thank you for sharing the article.

    @ Adil Mukarram,
    Thank you very much for your comment. We will try to create a tutorial for that.

    ReplyDelete
  4. nice and easy to learn for beginners

    ReplyDelete
  5. thanX a Lot for such nice article. It helped me a lot. I searched for days but didn't find any good tutorial using hib with eclipse. :)

    ReplyDelete
  6. Very good tutorial!!! I've been looking for something like that for sometime..

    For beginners like me I would also add the stage of building the MySQL database and tables:

    1. Connect to your account at MySQL.
    2. Enter "CREATE DATABASE userdata;"
    3. Enter "USE userdata;"
    4. Enter "CREATE TABLE users(id int(10) AUTO_INCREMENT, first_name varchar(100), la
    st_name varchar(100), primary key(id));
    5. ENTER "CREATE TABLE tasks(id int(10) AUTO_INCREMENT, user_id int(10), title varc
    har(100), description varchar(100), primary key(id));"

    Also, if you need a password to access your MySQL database, you should provide it to the hibernate.cfg.xml file at the line HereShouldComeYourPassWord

    ReplyDelete
  7. Like++. Kudos to you Saranga. The clearest tutorial out there by far. Why couldn't the others make it this simple?

    ReplyDelete
  8. @ Pondu,
    Thanks for commenting Pondu.

    @ babarathotmail,
    I'm so happy to hear that. Thanks for commenting.

    @ gad.dan,
    Thank you very much for your comment. Since I have include the database I didn't put that information in the post.
    Next time I'll include it in the post and I updated the post telling about the MySQL password.

    @ Anonymous,
    Glad I could help brighten your day. :)

    ReplyDelete
  9. i am beginner to hibernate..I tried following the steps but getting the following error:

    12 [main] INFO org.hibernate.cfg.Environment - Hibernate 3.3.0.GA
    17 [main] INFO org.hibernate.cfg.Environment - hibernate.properties not found
    20 [main] INFO org.hibernate.cfg.Environment - Bytecode provider name : javassist
    26 [main] INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling
    67 [main] INFO org.hibernate.cfg.Configuration - configuring from resource: /hibernate.cfg.xml
    67 [main] INFO org.hibernate.cfg.Configuration - Configuration resource: /hibernate.cfg.xml
    747 [main] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : user.hbm.xml
    753 [main] ERROR org.hibernate.util.XMLHelper - Error parsing XML: XML InputStream(1) Premature end of file.
    Initial SessionFactory creation failed.org.hibernate.InvalidMappingException: Could not parse mapping document from resource user.hbm.xml
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:16)
    at com.hib.HibernateUtil.(HibernateUtil.java:7)
    at com.hib.Test.addUser(Test.java:61)
    at com.hib.Test.main(Test.java:20)
    Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource user.hbm.xml
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:602)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1621)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1589)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1568)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1542)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1448)
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:11)
    ... 3 more
    Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from input stream
    at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:541)
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:599)
    ... 10 more
    Caused by: org.dom4j.DocumentException: Error on line 1 of document : Premature end of file. Nested exception: Premature end of file.
    at org.dom4j.io.SAXReader.read(SAXReader.java:482)
    at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:532)
    ... 11 more

    ReplyDelete
  10. @ Neeti,
    Are you using diffrent package names? Then you have to change the given user.hbm.xml and task.hbm.xml.

    And also check the docktype declaration in above mapping files.
    (<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">)It should be there.
    Thank You !

    ReplyDelete
  11. Hi Neeti,

    I got the same problem, then i checked the cfg file DOCTYPE ;



    the above line has the error, there is a single quote for version and encoding. please change that to double quote's and check once.


    all the best. :)

    Thanks,
    Gangadhar

    ReplyDelete
  12. @ Gangadhar,
    It worked for me using single quote's. Anyway thanks for posting the solution. I'll update my post since it is working with double quote's too.

    FYI : You have to use a HTML Encoder when you post HTML codes in blogger, otherwise blogger will not be able to show them.

    Thank You !

    ReplyDelete
  13. Antonio:

    I was already in other two examples without success .. read some books and nothing

    Really great info!!! It helped me a lot.. Thanks!!
    :)

    ReplyDelete
  14. @ Le Unamme,
    Glad I could help brighten your day, Thanks for commenting.
    Thanks !

    ReplyDelete
  15. Hello! Very good manual? thanx )
    But when the application start, I have an error:

    2169 [main] WARN org.hibernate.cfg.SettingsFactory - Could not obtain connection to query metadata
    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

    Could you help me? plz?

    ReplyDelete
  16. @ Mihail,
    Can you post full error you are getting?
    Please check whether you are giving correct username and password to MYSQL in hibernate.cfg.xml file. Check whether you are giving correct path to it. Didn't you try downloading my project ?
    Thank You !

    ReplyDelete
  17. Ganesh : Facing some problem with error
    INFO: Configuration resource: hibernate.cfg.xml
    Initial SessionFactory creation failed.org.hibernate.HibernateException: Could not parse configuration: hibernate.cfg.xml
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:15)
    at com.hib.HibernateUtil.(HibernateUtil.java:6)
    at com.hib.Test.addUser(Test.java:60)
    at com.hib.Test.main(Test.java:19)
    Caused by: org.hibernate.HibernateException: Could not parse configuration: hibernate.cfg.xml
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1494)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1428)
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:10)
    ... 3 more
    Caused by: org.dom4j.DocumentException: Connection refused: connect Nested exception: Connection refused: connect
    at org.dom4j.io.SAXReader.read(SAXReader.java:484)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1484)
    ... 5 more

    ReplyDelete
  18. I'm getting error in session.getTransaction() ..help me to resolve it

    ReplyDelete
  19. Thank you! this is a very good post for starting it off!

    ReplyDelete
  20. @ test,
    Check whether your hibernate.cfg.xml file is in the correct place.
    Thanks !

    ReplyDelete
  21. @ saranraju,
    Can you post the full error. Thanks !

    @ Dalen,
    Glad I could help brighten your day. Thanks for commenting.

    ReplyDelete
  22. Thank you very much! this is a very useful post

    ReplyDelete
  23. Thanks for the article. I always feel starting with an example helps a lot in core concepts.

    ReplyDelete
  24. Hi i am constantly getting the same error

    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at com.hib.Test.addUser(Test.java:79)
    at com.hib.Test.main(Test.java:20)

    Can some body please help me

    ReplyDelete
  25. It is very nice example in hibernate, easy to understand. please continue to write other practicales so that we can familiar with hibernate.
    Thank you so much.

    ReplyDelete
  26. Thank you very much! But encountered the same error "Neeti"
    (
    287 [main] INFO org.hibernate.annotations.common.Version - Hibernate Commons Annotations 3.2.0.Final
    298 [main] INFO org.hibernate.cfg.Environment - Hibernate 3.6.8.Final
    ...
    )

    I'm checked hibernate.cfg.xml file but not fix. Can you share project of Eclipse for tutorial. Thanks from Viet Nam!

    ReplyDelete
  27. @ Unknown,
    I have shared the project and you can download it from the link given at the end of the post.
    Thanks !

    ReplyDelete
  28. nice dear,it is really good for beginners......

    ReplyDelete
  29. thanks for posting tutorial for beginners..
    But i am not able to run it successfully.
    I am getting following error :
    org.hibernate.exception.JDBCConnectionException: Cannot open connection
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
    at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
    at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
    at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
    at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
    at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
    at com.hib.Test.addUser(Test.java:63)
    at com.hib.Test.main(Test.java:20)
    Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

    The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
    at com.mysql.jdbc.MysqlIO.(MysqlIO.java:344)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
    at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:792)
    at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)
    at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
    ... 6 more
    Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.(Unknown Source)
    at java.net.Socket.(Unknown Source)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
    at com.mysql.jdbc.MysqlIO.(MysqlIO.java:294)
    ... 22 more
    --------------------------------------------
    Please suggest me the solution ...

    hibernate.cfg.xml file is ....





    com.mysql.jdbc.Driver
    jdbc:mysql://localhost/kgtest
    root
    MyNewPass


    1


    org.hibernate.dialect.MySQLDialect


    thread


    org.hibernate.cache.NoCacheProvider


    true


    update

    ReplyDelete
  30. great article.. just the way i wanted it :)

    ReplyDelete
  31. i faces the problem for the creating the hibernate for that i post the question on stackoverflow and link is given below

    http://stackoverflow.com/questions/9084087/error-for-the-creating-the-hibernate

    please try to solve my problem.

    ReplyDelete
  32. @ SatyAnveshak,
    Please make sure database is up and running.

    @ rakshitha,
    You are welcome !

    @ Nimit,
    There is no error here. Please describe your problem.

    ReplyDelete
  33. Sara,
    I'm getting the following error. Could you please help?

    Feb 3, 2012 1:50:03 PM org.hibernate.annotations.common.Version
    INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
    Feb 3, 2012 1:50:04 PM org.hibernate.Version logVersion
    INFO: HHH000412: Hibernate Core {4.0.1.Final}
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Environment
    INFO: HHH000206: hibernate.properties not found
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Environment buildBytecodeProvider
    INFO: HHH000021: Bytecode provider name : javassist
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Configuration configure
    INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Configuration getConfigurationInputStream
    INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Configuration addResource
    INFO: HHH000221: Reading mappings from resource: user.hbm.xml
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Configuration addResource
    INFO: HHH000221: Reading mappings from resource: task.hbm.xml
    Feb 3, 2012 1:50:04 PM org.hibernate.cfg.Configuration doConfigure
    INFO: HHH000041: Configured SessionFactory: null
    Initial SessionFactory creation failed.org.hibernate.InvalidMappingException: Could not parse mapping document from resource user.hbm.xml
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.lib.HibernateUtil.buildSessionFactory(HibernateUtil.java:16)
    at com.lib.HibernateUtil.(HibernateUtil.java:7)
    at com.lib.Test.addUser(Test.java:61)
    at com.lib.Test.main(Test.java:20)
    Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource user.hbm.xml
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:3380)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXmlQueue(Configuration.java:3369)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3357)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1334)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1724)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775)
    at com.lib.HibernateUtil.buildSessionFactory(HibernateUtil.java:11)
    ... 3 more
    Caused by: org.hibernate.MappingException: class com.hib.User not found while looking for property: firstName
    at org.hibernate.internal.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:232)
    at org.hibernate.mapping.SimpleValue.setTypeUsingReflection(SimpleValue.java:314)
    at org.hibernate.cfg.HbmBinder.createProperty(HbmBinder.java:2247)
    at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:2224)
    at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:2114)
    at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:405)
    at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:320)
    at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:171)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:3377)
    ... 9 more
    Caused by: java.lang.ClassNotFoundException: com.hib.User
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
    at org.hibernate.internal.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:228)
    ... 17 more

    ReplyDelete
  34. Saranga,
    Have you got a chance to take a look at the error in my previous post?

    Thanks a lot!

    Wei

    ReplyDelete
  35. @ Wei,

    Sorry for the late reply.

    Please double check your "user.hbm.xml" file. Check whether you have set the class attribute correctly with package.
    e.g. class name="com.hib.User" table="users"
    Did you try downloading my code ?
    Thank You !

    ReplyDelete
  36. Great tutorial

    I tried running it and came across a problem I am unable to solve.

    I am getting the following failure:


    Initial SessionFactory creation failed.org.hibernate.HibernateException: could not instantiate RegionFactory [org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge]
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:16)
    at com.hib.HibernateUtil.(HibernateUtil.java:7)
    at com.hib.Test.addUser(Test.java:61)
    at com.hib.Test.main(Test.java:20)
    Caused by: org.hibernate.HibernateException: could not instantiate RegionFactory [org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge]
    at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:423)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:280)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2833)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2829)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1840)
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:11)
    ... 3 more
    Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:409)
    ... 8 more
    Caused by: org.hibernate.cache.CacheException: could not instantiate CacheProvider [org.hibernate.cache.internal.NoCacheProvider]
    at org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.(RegionFactoryCacheProviderBridge.java:66)
    ... 13 more
    Caused by: java.lang.ClassNotFoundException: org.hibernate.cache.internal.NoCacheProvider
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)
    at org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.(RegionFactoryCacheProviderBridge.java:63)
    ... 13 more



    Seems the the code falls on :

    return new Configuration().configure().buildSessionFactory();

    Any ideas as to what it may be?

    Best wishes,
    CK

    ReplyDelete
  37. I see what to do up to fig.4. Fig 4 has what looks to be a library icon and not a plain folder icon. What instructions give this type of icon?

    thanks,
    Matias

    ReplyDelete
    Replies
    1. Hi Matias,
      Sorry, there was an issue with the order of images, Please check it now.
      Thanks !

      Delete
  38. how to execute this program.when i execute this program then null pointer exception is coming.

    ReplyDelete
    Replies
    1. Sorry for the late reply. Did you able to fix this? What was the issue ?

      Delete
  39. Hi,I downloaded the distribution bundle,but i cannot find the file 'hibernate3.zip' in it,as you have mentioned to copy it in the lib folder of my project.The distribution bundle that i downloaded is 'hibernate-release-4.1.0.Final'.

    ReplyDelete
    Replies
    1. Did you able to find it? It should be there.

      Delete
  40. Really a helpful article for Begineers.

    ReplyDelete
  41. Very nice article .... thank you

    ReplyDelete
  42. hi I am Amit Pathak
    this very good article for beginners
    I am getting following error while executing the code....
    plz help me




    Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:16)
    at com.hib.HibernateUtil.(HibernateUtil.java:7)
    at com.hib.Test.addUser(Test.java:64)
    at com.hib.Test.main(Test.java:23)
    Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.hibernate.cfg.Configuration.(Configuration.java:110)
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:11)
    ... 3 more
    Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 5 more

    ReplyDelete
  43. Thanks man, Your article is really helpful

    ReplyDelete
  44. This is great mate, thanks heaps for this great tutorial. Cheers from New Zealand.

    ReplyDelete
  45. I have used oracle database instead of mysql and I have changed code according to oracle whereever it is required.
    My hibernate.cfg.xml is as following:





    oracle.jdbc.driver.OracleDriver
    jdbc:oracle:thin:@172.20.46.54:1521:entmon
    emon
    emon


    1


    org.hibernate.dialect.oracle10gdialect


    thread


    org.hibernate.cache.NoCacheProvider


    true


    update








    and it's throwing following exception when I ran Test.java class


    Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:17)
    at com.hib.HibernateUtil.(HibernateUtil.java:8)
    at com.hib.Test.addUser(Test.java:61)
    at com.hib.Test.main(Test.java:20)
    Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.hibernate.cfg.Configuration.(Configuration.java:117)
    at com.hib.HibernateUtil.buildSessionFactory(HibernateUtil.java:12)
    ... 3 more
    Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 5 more

    ReplyDelete
  46. Very nice article .... thank you!!

    I'm getting the following failure:

    Grave: Context initialization failed
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/InvalidMappingException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    ...
    Caused by: java.lang.NoClassDefFoundError: org/hibernate/InvalidMappingException
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2404)
    at java.lang.Class.getConstructor0(Class.java:2714)
    at java.lang.Class.getDeclaredConstructor(Class.java:2002)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:104)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newConfiguration(LocalSessionFactoryBean.java:818)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:549)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:188)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
    ... 42 more
    Caused by: java.lang.ClassNotFoundException: org.hibernate.InvalidMappingException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
    ... 52 more

    Do you have any idea??

    Thanks!!

    ReplyDelete
  47. org.hibernate.InvalidMappingException: Unable to read XML
    at org.hibernate.util.xml.MappingReader.readMappingDocument(MappingReader.java:101)
    at org.hibernate.cfg.Configuration.add(Configuration.java:513)
    at org.hibernate.cfg.Configuration.add(Configuration.java:509)
    at org.hibernate.cfg.Configuration.add(Configuration.java:716)
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:801)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2344)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2310)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2290)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2243)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:2158)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:2137)
    at InsertTest.main(InsertTest.java:13)
    Caused by: org.dom4j.DocumentException: Error on line 16 of document : The element type "class" mus
    t be terminated by the matching end-tag "". Nested exception: The element type "class" must
    be terminated by the matching end-tag "".
    at org.dom4j.io.SAXReader.read(SAXReader.java:482)
    at org.hibernate.util.xml.MappingReader.readMappingDocument(MappingReader.java:75)
    ... 11 more
    Exception in thread "main" java.lang.NullPointerException
    at InsertTest.main(InsertTest.java:38)

    ReplyDelete
  48. Thanks for providing this tutorial.

    ReplyDelete
  49. Thanks for everything , but i got this fault event when i use MXML with this tutorial :
    Received fault: [RPC Fault faultString="org/hibernate/Session" faultCode="Server.Processing" faultDetail="null"]
    can you help me with that ?

    ReplyDelete
  50. thanks yaar...that was a good one..

    ReplyDelete
  51. Hello, first thanks for your tutorial, it's very practical. I'll mention it in my blog.

    Second, I've found some errors, while putting this exercise.
    1.-I found the solution. I add JPA jar (i got an exception about this).
    The exception was: Exception in thread “main” java.lang.NoClassDefFoundError: javax/persistence/EntityListeners

    2.-I put it a default value in my keys in mysql (I had an exception with this).

    3.-I am having an exception, I've read that I can use
    but it still doesn't work.

    Here is the exception
    Hibernate: insert into users (first_name, last_name) values (?, ?)
    org.hibernate.HibernateException: The database returned no natively generated identity value
    at org.hibernate.id.IdentifierGeneratorHelper.getGeneratedIdentity(IdentifierGeneratorHelper.java:86)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:97)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:56)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2346)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2853)
    at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    at

    ReplyDelete
  52. I give realized.... my keys have to be AUTO-INCREMENT .....

    ReplyDelete
  53. Hi!
    The first time that i run the application everything is ok!
    The second time I face that problem(exception)....

    Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:85)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:70)
    at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:90)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:189)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    at com.hib.Test.deleteUser(Test.java:186)
    at com.hib.Test.main(Test.java:55)
    1257 [main] ERROR org.hibernate.event.def.AbstractFlushingEventListener - Could not synchronize database state with session
    org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:85)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:70)
    at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:90)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:189)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    at com.hib.Test.deleteUser(Test.java:186)
    at com.hib.Test.main(Test.java:55)
    org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:85)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:70)
    at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:90)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:189)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    at com.hib.Test.deleteUser(Test.java:186)
    at com.hib.Test.main(Test.java:55)

    ReplyDelete
  54. hi,

    i'm using Jboss, hibernate3 and ejb 2.x ... i got error while run my module.

    ERROR [org.jboss.ejb.plugins.LogInterceptor] Unexpected Error in method: public abstract java.lang.Object utils.cs.CommonSearch.getRecordsByJDlgId(java.lang.String) throws java.rmi.RemoteException
    java.lang.NoClassDefFoundError: Could not initialize class utils.cs.HibernateUtil
    at utils.cs.CommonSearchBean.getRecordsByJDlgId(CommonSearchBean.java:560)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.invocation.Invocation.performCall(Invocation.java:359)
    at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:237)
    at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:158)
    at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:169)
    at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
    at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
    at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350)
    at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181)
    at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:168)
    at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
    at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:138)
    at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:648)
    at org.jboss.ejb.Container.invoke(Container.java:960)
    at sun.reflect.GeneratedMethodAccessor364.invoke(Unknown Source)

    ReplyDelete
  55. I'm getting the following failure:

    Exception in thread "main" java.lang.NoClassDefFoundError: HibernateTestCase

    ReplyDelete
  56. log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
    log4j:WARN Please initialize the log4j system properly.
    Hibernate: insert into users (first_name, last_name) values (?, ?)
    org.hibernate.exception.GenericJDBCException: could not insert: [com.hib.User]
    at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:40)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2108)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2588)
    at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:290)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:180)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:108)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
    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.hib.Test.addUser(Test.java:70)
    at com.hib.Test.main(Test.java:20)
    Caused by: java.sql.SQLException: Could not retrieve transation read-only status server
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941)
    at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3936)
    at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3907)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2408)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:73)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:33)
    ... 17 more
    Caused by: java.sql.SQLException: Unknown system variable 'tx_read_only'
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4187)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4119)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2809)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2758)
    at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1612)
    at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3930)
    ... 23 more

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