hibernate by 85 comments

Maven 2 + Hibernate 3.2 + MySQL Example (XML Mapping)

Note
This article is outdated, please refer to the latest Hibernate 3.6 tutorial at – Maven 3 + Hibernate 3.6 + Oracle 11g Example (XML Mapping).

This quick guide show you how to use Maven to generate a simple Java project, and uses Hibernate to insert a record into MySQL database.

Tools & technologies used in this article :

  1. Maven 2.2.1
  2. JDK 1.6.0_13
  3. Hibernate 3.2.3.GA
  4. MySQL 5.0

1. Table Creation

MySQL script to create a “stock” table.


DROP TABLE IF EXISTS `stock`;
CREATE TABLE `stock` (
  `STOCK_ID` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `STOCK_CODE` VARCHAR(10) NOT NULL,
  `STOCK_NAME` VARCHAR(20) NOT NULL,
  PRIMARY KEY (`STOCK_ID`) USING BTREE,
  UNIQUE KEY `UNI_STOCK_NAME` (`STOCK_NAME`),
  UNIQUE KEY `UNI_STOCK_ID` (`STOCK_CODE`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2. Generate project structure with Maven

In command prompt, Issue “mvn archetype:generate“, choose project #15 to create a quick start Maven’s java project, then fill in your project’s information – groupId , artifactId and package.


E:\workspace>mvn archetype:generate
[INFO] Scanning for projects...
...
Choose a number:  
(1/2/3....) 15: : 15
...
Define value for groupId: : com.mkyong.common
Define value for artifactId: : HibernateExample
Define value for version:  1.0-SNAPSHOT: :
Define value for package:  com.mkyong.common: : com.mkyong.common
[INFO] OldArchetype created in dir: E:\workspace\HibernateExample
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------

3. Convert to Eclipse project

Issue “mvn eclipse:eclipse” to convert the newly generated project to Eclipse’s style project

4. Import converted project into Eclipse IDE

In Eclipse IDE, Choose File –> Import –> General folder, Existing Projects into Workspace –>Choose your project folder location. Done

5. Create a resources folder

Create a resources folder under “src/main” folder, “/src/main/resources” , later all the Hibernate’s xml files will put here. Maven will treat all files in this folder as resources files, and copy it to output classes automatically.

6. Review project structure

Make sure the folder structure as following

hibernate-example-1

Maven will generate all the Java’s standard folders structure for you (beside resources folder, quick start archetype #15 does not contains the resources folder)

7. Add Hibernate and MySQL dependency

Modify the Maven’s pom.xml file, add support for Hibernate and MySQL. Hibernate is required dom4j, commons-logging, commons-collections and cglib as dependency library, add it.

File : pom.xml


<project ...>
<modelVersion>4.0.0</modelVersion>
  <groupId>com.mkyong.common</groupId>
  <artifactId>HibernateExample</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>HibernateExample</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
        <!-- MySQL database driver -->
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>5.1.9</version>
	</dependency>
	
	<!-- Hibernate framework -->
	<dependency>
		<groupId>hibernate</groupId>
		<artifactId>hibernate3</artifactId>
		<version>3.2.3.GA</version>
	</dependency>
	
	
	<!-- Hibernate library dependecy start -->
	<dependency>
		<groupId>dom4j</groupId>
		<artifactId>dom4j</artifactId>
		<version>1.6.1</version>
	</dependency>
	
	<dependency>
		<groupId>commons-logging</groupId>
		<artifactId>commons-logging</artifactId>
		<version>1.1.1</version>
	</dependency>
	
	<dependency>
		<groupId>commons-collections</groupId>
		<artifactId>commons-collections</artifactId>
		<version>3.2.1</version>
	</dependency>
	
	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>2.2</version>
	</dependency>
	<!-- Hibernate library dependecy end -->
	
	<dependency>
		<groupId>javax.transaction</groupId>
		<artifactId>jta</artifactId>
		<version>1.1</version>
	</dependency>
	
  </dependencies>
</project>

Issue the “mvn eclipse:eclipse“, Maven will download all Hibernate and MySQL libraries automatically and put into Maven’s local repository. At the same time, Maven will add the downloaded libraries into Eclipse “.classpath” for dependency purpose. Like it again 🙂 , no need to find the library and copy it myself.

8. Create Hibernate Mapping file + Model class

In prerequisite requirement , a table named “stock” is created, now you will need to create a Hibernate XML mapping file and model class for it.

Create a Stock.hbm.xml file and put it in “src/main/resources/com/mkyong/common/Stock.hbm.xml“. Create “resources/com/mkyong/common/” folder if it does not exists.

File : Stock.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.mkyong.common.Stock" table="stock" catalog="mkyong">
        <id name="stockId" type="java.lang.Integer">
            <column name="STOCK_ID" />
            <generator class="identity" />
        </id>
        <property name="stockCode" type="string">
            <column name="STOCK_CODE" length="10" not-null="true" unique="true" />
        </property>
        <property name="stockName" type="string">
            <column name="STOCK_NAME" length="20" not-null="true" unique="true" />
        </property>
    </class>
</hibernate-mapping>

Create a Stock.java file and put it in “src/main/java/com/mkyong/common/Stock.java”

File : Stock.java


package com.mkyong.common;

/**
 * Model class for Stock
 */
public class Stock implements java.io.Serializable {

	private static final long serialVersionUID = 1L;

	private Integer stockId;
	private String stockCode;
	private String stockName;

	public Stock() {
	}

	public Stock(String stockCode, String stockName) {
		this.stockCode = stockCode;
		this.stockName = stockName;
	}

	public Integer getStockId() {
		return this.stockId;
	}

	public void setStockId(Integer stockId) {
		this.stockId = stockId;
	}

	public String getStockCode() {
		return this.stockCode;
	}

	public void setStockCode(String stockCode) {
		this.stockCode = stockCode;
	}

	public String getStockName() {
		return this.stockName;
	}

	public void setStockName(String stockName) {
		this.stockName = stockName;
	}

}
Note
Create the model class and mapping files are quite tedious in large application, With Hibernate tools, this can be generate automatically, check this article – Hibernate tools to generate it automatically.

9. Create Hibernate Configuration file

Create a Hibernate’s configuration file and put under the resources root folder, “src/main/resources/hibernate.cfg.xml“. Fill in your MySQL setting accordingly.

File : hibernate.cfg.xml


<?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.bytecode.use_reflection_optimizer">false</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">password</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mkyong</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">true</property>
        <mapping resource="com/mkyong/common/Stock.hbm.xml"></mapping>
    </session-factory>
</hibernate-configuration>

Set the “show_sql” property to true will output the Hibernate SQL statement. Hibernate Dialect is telling your Hibernate application which SQL it has to generate to talk to your database. Please refer this article for other database dialect – Hibernate dialect collection.

10. Create Hibernate Utility class

Create a HibernateUtil.java class to take care of Hibernate start up and retrieve the session easily. Create a persistence folder and put this file in it, “src/main/java/com/mkyong/persistence/HibernateUtil.java”

File : HibernateUtil.java


package com.mkyong.persistence;

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;
    }
    
    public static void shutdown() {
    	// Close caches and connection pools
    	getSessionFactory().close();
    }

}

11. Review project structure again

Sound like create many new files and folders, review it and make sure the folder structure as following

hibernate-example-2

12. Code it to save the record

Modify the default App.java class as following :

File : App.java


package com.mkyong.common;

import org.hibernate.Session;
import com.mkyong.persistence.HibernateUtil;

public class App 
{
    public static void main( String[] args )
    {
        System.out.println("Maven + Hibernate + MySQL");
        Session session = HibernateUtil.getSessionFactory().openSession();
        
        session.beginTransaction();
        Stock stock = new Stock();
        
        stock.setStockCode("4715");
        stock.setStockName("GENM");
        
        session.save(stock);
        session.getTransaction().commit();
    }
}

13. Run it and see output

Run your App.java, it will insert a new record into “Stock” table.


Maven + Hibernate + MySQL
...
Dec 17, 2009 5:05:26 PM org.hibernate.impl.SessionFactoryObjectFactory addInstance
INFO: Not binding factory to JNDI, no JNDI name configured
Hibernate: insert into mkyong.stock (STOCK_CODE, STOCK_NAME) values (?, ?)

Done.

Download it – Maven_Hibernate_MySQL_Example.zip (12kb)

Reference

  1. http://docs.jboss.org/hibernate/core/3.3/reference/en/html/tutorial.html

85 comments on “Maven 2 + Hibernate 3.2 + MySQL Example (XML Mapping)”

  3. Exception in thread “main” java.lang.UnsupportedClassVersionError: org/hibernate/Session : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2521)
    at java.lang.Class.getMethod0(Class.java:2764)
    at java.lang.Class.getMethod(Class.java:1653)
    at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)

    I am facing this error. kindly help..

    Reply

  11. final pom.xml looks like this

    4.0.0

    com.hibernate.ex
    HibernateSample
    0.0.1-SNAPSHOT
    jar

    HibernateSample
    http://maven.apache.org

    UTF-8

    junit
    junit
    3.8.1
    test

    mysql
    mysql-connector-java
    5.1.9

    org.hibernate
    hibernate
    3.2.3.ga

    dom4j
    dom4j
    1.6.1

    commons-logging
    commons-logging
    1.1.1

    commons-collections
    commons-collections
    3.2.1

    cglib
    cglib
    2.2

    javax.transaction
    jta
    1.1

    asm
    asm
    3.1

    Reply

  12. in hibernate version 4. 3 both buildSessionfactory() and ServiceRegistryBuilder() are deprecated.

    so u have change your coding like below to get session factory for hibernate version 4.3

    public class HibernateSessionFactory {

    private static final SessionFactory sessionFactory = buildSessionFactory1();

    private static SessionFactory buildSessionFactory1() {
    Configuration configuration = new Configuration().configure(); // configuration
    // settings
    // from
    // hibernate.cfg.xml

    StandardServiceRegistryBuilder serviceRegistryBuilder = new StandardServiceRegistryBuilder();

    serviceRegistryBuilder.applySettings(configuration.getProperties());

    ServiceRegistry serviceRegistry = serviceRegistryBuilder.build();

    return configuration.buildSessionFactory(serviceRegistry);
    }

    public static SessionFactory getSessionFactory() {
    return sessionFactory;
    }

    public static void shutdown() {
    // Close caches and connection pools
    getSessionFactory().close();
    }

    }

    Reply

  15. Hi,

    Yesterday I wrote one hiberanate program for curd operation as well as in JDBC also.But I am getting JDBC more faster than hibernate.So, why people says that hibernate is fister than JDBC.

    Reply

  17. What is the use of implementing java.io.serializable interface?
    Can’t we able to achieve the functionality without implementing serializable interface?

    Reply

    1. <dependency>
      <groupId>org.hibernate </groupId>
      <artifactId>hibernate </artifactId>
      <version>3.2.3.ga </version>
      </dependency>

      Reply

  19. Please Help: I tried this example, got the error:

    Initial SessionFactory creation failed.org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
    Exception in thread “main” java.lang.ExceptionInInitializerError
    at com.mkyong.persistence.HibernateUtil.buildSessionFactory(HibernateUtil.java:18)
    at com.mkyong.persistence.HibernateUtil.(HibernateUtil.java:8)
    at com.mkyong.common.App.main(App.java:11)
    Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:110)
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:135)
    at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.(EntityEntityModeToTuplizerMapping.java:56)
    at org.hibernate.tuple.entity.EntityMetamodel.(EntityMetamodel.java:323)
    at org.hibernate.persister.entity.AbstractEntityPersister.(AbstractEntityPersister.java:433)
    at org.hibernate.persister.entity.SingleTableEntityPersister.(SingleTableEntityPersister.java:109)
    at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
    at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:231)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1313)
    at com.mkyong.persistence.HibernateUtil.buildSessionFactory(HibernateUtil.java:13)
    … 2 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.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:107)
    … 11 more
    Caused by: java.lang.NoSuchMethodError: org.objectweb.asm.ClassWriter.(I)V
    at net.sf.cglib.core.DebuggingClassWriter.(DebuggingClassWriter.java:47)
    at net.sf.cglib.core.DefaultGeneratorStrategy.getClassWriter(DefaultGeneratorStrategy.java:30)
    at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:24)
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144)
    at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:116)
    at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)
    at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)
    at net.sf.cglib.proxy.Enhancer.(Enhancer.java:69)
    at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:117)
    at org.hibernate.proxy.pojo.cglib.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:43)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:188)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.(AbstractEntityTuplizer.java:128)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.(PojoEntityTuplizer.java:78)
    … 16 more

    Reply

    1. somehow removing cglib jar from pom.xml worked for me. I think you might have already found the answer, but it might help someone else.

      Reply

  22. Hi
    This is an amazing tuto and really works.
    But I have a little question what about if I want to create a .jar file of this app?

    I tried to do it but doenst work, what is needed to do it? another kind of configuration to run in standalone mode?

    Please I need to know! xd
    Thanks a lot

    Reply

  23. Hi,Thanks for making the thing simple for us.Your example are really useful to learn.I learnt Spring only from your example.Thanks a lot.Now i started Hibernate.I was trying with the first example and i am gettinh the below exception.Can you plz help me to sort it …

    Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/dom4j/DocumentException
    Exception in thread “main” java.lang.ExceptionInInitializerError
    at com.mukesh.hibernate.testing.HibernateTest.HibernateUtil.buildSessionFactory(HibernateUtil.java:17)
    at com.mukesh.hibernate.testing.HibernateTest.HibernateUtil.(HibernateUtil.java:8)
    at com.mukesh.hibernate.testing.HibernateTest.App.main(App.java:12)
    Caused by: java.lang.NoClassDefFoundError: org/dom4j/DocumentException
    at com.mukesh.hibernate.testing.HibernateTest.HibernateUtil.buildSessionFactory(HibernateUtil.java:13)
    … 2 more
    Caused by: java.lang.ClassNotFoundException: org.dom4j.DocumentException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    … 3 more

    Reply

  27. Exception in thread “main” java.lang.ExceptionInInitializerError
    at com.example.chapter01.EventClient.main(EventClient.java:18)
    Caused by: org.hibernate.HibernateException: /hibernate.cfg.xml not found
    at org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170)
    at org.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:1439)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1461)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1448)
    at com.example.chapter01.HibernateUtil.buildSessionFactory(HibernateUtil.java:12)
    at com.example.chapter01.HibernateUtil.(HibernateUtil.java:8)
    … 1 more

    Reply

    1. you can change the path of hibernate.cfg.xml

      because when you run the program the Relative path of the project has changed?

      Reply

  30. From my humble opinion, most maven dependencies are not necessary, for your examples, “hibernate core” and “mysql-connector” dependency are sufficient. Anyway, your tutorial is easy to follow, thank you very much!

    Reply

  32. I am getting a “hibernate.cfg.xml” not found exception. Have tried all the possible solutions available on the net. Any idea why this might be happening…

    Reply

      1. Hi,

        Thank You for your reply 😉
        I Solved the problem. But I had to load the file from the Hibernate util by creating a file object and providing the physical path of the file on the machine. Any idea why this might be needed? I think there is some issue with eclipse (not sure though).

        Reply

  33. hi,
    I exactly do what you say in steps
    but I have problem with some of the import,
    this error:
    “the import org.hibernate can not be resolved”
    what should I do?
    please help
    thanks a lot

    Reply

    1. Zahra I got the same error I did this and fix it:
      add to pom:

      <dependency>
	<groupId>org.hibernate</groupId>
	<artifactId>hibernate-core</artifactId>
	<version>3.6.3.Final</version>
</dependency>

      🙂

      Reply

  36. SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”.
    SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
    Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
    Exception in thread “main” java.lang.ExceptionInInitializerError
    at com.mkyong.persistence.HibernateUtil.buildSessionFactory(HibernateUtil.java:20)
    at com.mkyong.persistence.HibernateUtil.(HibernateUtil.java:10)
    at com.mkyong.common.App.main(App.java:17)
    Caused by: java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
    at org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:223)
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:120)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:269)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:242)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:255)
    at org.hibernate.cfg.Configuration.(Configuration.java:152)
    at com.mkyong.persistence.HibernateUtil.buildSessionFactory(HibernateUtil.java:15)
    … 2 more
    Caused by: java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder
    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.ClassLoader.loadClassInternal(Unknown Source)
    … 10 more

    Reply

  37. If you are using Maven then use this dependenices in your POM.xml.

      
    
    
    	com.h2database
    	h2
    	1.3.155
    	jar
    	compile
    
    
    
    
    	org.hibernate
    	hibernate-core
    	3.6.4.Final
    	jar
    	compile    	
    

    
    	javassist
    	javassist
    	3.12.1.GA
    	jar
    	compile
    
    
    
    
    	ch.qos.logback
    	logback-classic
    	0.9.28
    	jar
    	compile
    Reply

  38. Stupid question number one. And this is Maven question not Hibernate (hint, hint, hint, please create Tutorial for Maven, hehehe)

    From which directory do I run mvn eclipse:eclipse command. I’m assuming I run it from with the PROJECT DIRECTORY since command is operating on the Project.

    Second, Once I “Eclipsify” the Maven Project and have imported it into Eclipse, AND then I have to change pom.xml to add additional dependencies, if I go and run mvn eclipse:eclipse again, I will have to refresh Project Folder inside Eclipse. Is there easy way to execute mvn from inside Eclipse?

    Reply

    1. 1. Run where the pom.xml reside.

      2. Eclipse IDE –> Run –> External Tool, put your maven command here. Later you can run mvn command inside Eclipse IDE.

      Will provides more Maven examples in future. Thanks for suggestions.

      Reply

  39. Hi,

    Nice site. Very informative.

    I’m trying to run the Hibernate example but I get:

    …
    [WARNING] An error occurred during dependency resolution.
    Failed to retrieve com.vaadin:vaadin-6.1-SNAPSHOT
    Caused by: Could not find artifact com.vaadin:vaadin:jar:6.1-SNAPSHOT

    Try downloading the file manually from the project website.
    …

    When I look on the vaadin site they don’t have version 6.1 – only 6.4.x – is it okay to modify the version number in pom.xml to use the later/est version?

    Reply

    1. This is at step 6 of the tutorial but I should probably first try to resolve an earlier problem: something I noticed at step 5 is that the project structure I get is different to the one shown in the image. For example I don’t get a test directory at all. And under ‘src/main/java’ I get ColorPicker code instead of App, Stock etc.

      Can you tell me why this is?

      Thanks.

      Reply

  40. soy de Venezuela,me ayudaste un mundo con este ejemplo…los otros que había consultado no funcionaban mil gracias!!!!

    I’m from Venezuela, helped me a world with this example … the other that she had not worked .many thanks!!

    Reply

  41. Changes
    ————————————-
    1. Hibernate maven repository change to jboss ,please add follow in pom.xml

    <repositories>
    <repository>
    <id>JBoss</id>
    <name>JBoss Repsitory</name>
    <layout>default</layout>
    <url>http://repository.jboss.org/maven2</url&gt;
    </repository>
    </repositories>
    2. Add jta class dependency

    javax.transaction
    jta
    1.1
    compile

    Hope this helpful

    Reply

  43. I love your website. It has helped me several times so far.
    Right now I have this problem. I use MySQL and hibernate with java. After a while i get these exceptions:
    java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes

    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

    I know it is a common problem on the web but I haven’t found the solution.
    Can anyone help me with this?

    Thank you

    Reply

  44. am getting this as output in eclipse console , help me out

    Maven + Hibernate + MySQL

    Exception in thread "main" java.lang.NoClassDefFoundError: javax/transaction/Synchronization
	...
Caused by: java.lang.ClassNotFoundException: javax.transaction.Synchronization
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	... 5 more
    Reply

      1. when i give mvn eclipse:clean eclipse:eclipse in command line ..
        am getting a message like this ..

        Please run the same goal with the -DdownloadSources=true parameter in order to check remote repositories for sources.

        Reply

          1. still am getting errors , so i thought this might be related to it ..
            the exception error message is …

            Caused by: java.lang.ClassNotFoundException: javax.transaction.Synchronization
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	... 5 more

          3. please give me the updated pom.xml file ..

            and also suggest some more tutorials for me to learn hibernate using maven convention in eclipse IDE

          6. Hi Vijay,

            I met the same problem with you. But try these may help you out (basically, rebuild your project for Eclipse):
            1. under HibernateExample folder: mvn clean
            2. mvn install
            3. mvn -Declipse.workspace= eclipse:configure-workspace
            4. mvn eclipse:clean
            5. mvn eclipse:eclipse

  46. It looks like the jta dependency is now required. I verified this using my own project (slightly different from yours), then tried again with the project .zip file listed on this page. If you try to run the app, you’ll get something like this:

    [ERROR] BUILD ERROR
    [INFO] ————————————————————————
    [INFO] An exception occured while executing the Java class. null

    javax.transaction.Synchronization

    To fix it, I added the following to the pom.xml:

    javax.transaction
    jta
    1.1
    jar
    compile

    Otherwise, thanks for a very helpful tutorial!

    Reply

  47. I am just learning maven, and thought to try out your tutorial. I had a problem with hibernate, since there does not seem to be a hibernate3 directory (artifactID) or 3.2.3.GA (version).

    I tried finding alternatives, but then it couldn’t find source files for this and for asm.

    Reply

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