Question

I have programmed a simple hibernate app which leaves me with errors. The following is my code.

Contact.java

public class Contact {
 private String firstName;
 private String lastName;
 private String email;
 private long id;


 public String getEmail() {
  return email;
 }


 public String getFirstName() {
  return firstName;
 }


 public String getLastName() {
  return lastName;
 }


 public void setEmail(String string) {
  email = string;
 }


 public void setFirstName(String string) {
  firstName = string;
 }


 public void setLastName(String string) {
  lastName = string;
 }


 public long getId() {
  return id;
 }


 public void setId(long l) {
  id = l;
 }

}

FirstExample.java

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



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

  try{

  SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
  session =sessionFactory.openSession();

  System.out.println("Inserting Record");
  Contact contact = new Contact();
  contact.setId(3);
  contact.setFirstName("Tausif");
  contact.setLastName("rahmathullah");
  contact.setEmail("[e-mail]");
  session.save(contact);
  System.out.println("updated");
  }catch(Exception e){
    System.out.println(e.getMessage());
    e.printStackTrace();
   }finally{
    if(session!=null){
     session.flush();
     session.close();
    }
   }
  }
 }

hibernate.cfg.xml

<?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">com.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost/simpHiber</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.connection.password">root</property>
  <property name="hibernate.connection.pool_size">10</property>
  <property name="show_sql">true</property>
  <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
  <property name="hibernate.hbm2ddl.auto">update</property>
  <mapping resource="contact.hbm.xml"/>
 </session-factory>
</hibernate-configuration>

contact.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="Contact" table="CONTACT">
  <id name="id" type="long" column="ID" >
   <generator class="assigned"/>
  </id>

  <property name="firstName">
   <column name="FIRSTNAME" />
  </property>
  <property name="lastName">
   <column name="LASTNAME"/>
  </property>
  <property name="email">
   <column name="EMAIL"/>
  </property>
 </class>
</hibernate-mapping>

Error

D:\TausifProjects\simpHiber>java FirstExample
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Level
    at org.slf4j.LoggerFactory.<clinit>(LoggerFactory.java:60)
    at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:197)
    at FirstExample.main(FirstExample.java:15)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Level
    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)
    ... 3 more

Jar files in the buildpath

antlr-2.7.6.jar
commons-collections-3.1.jar
dom4j-1.6.1.jar
hibernate3.jar
hibernate3.3.1-slf4j-api-1.5.2.jar
hibernate-jpa-2.0-api-1.0.1.Final.jar
javassist-3.4.ga.jar
jcl-over-slf4j-1.5.2.jar
jta-1.1.jar
mysql-connector-java-5.0.0-bin.jar
slf4j-log4j12-1.5.5.jar
slf4j-jdk14-1.5.2-sources.jar

Please help me. Thanks in advance.

Answer 1

If you include slf4j-log4j.jar, then you must also include the log4j jar. Slf4j is a logging facade, which means it gives you a uniform interface to multiple other logging APIs.