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

If you see the only change in the file for the annotations is that we simply use AnnotationConfiguration() class instead of the Configuration() class to build the sessionFactory for the hibernate.

Step 2: Creating the Hibernate.cfg.xml

The Hibernate.cfg.xml is the configuration file for the datasource in the Hibernate world. The following is the example for the configuration file.

<?xml version=’1.0' encoding=’utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
”-//Hibernate/Hibernate Configuration DTD
3.0//EN”
”http://hibernate.sourceforge.net/hibernateconfiguration-
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:3306/test</property>
<property
name=”connection.username”>root</
property>
<property
name=”connection.password”>root</
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”>none
</property>
<mapping class=”com.roseindia.Employee”/>
</session-factory>
</hibernate-configuration>

The only change is that, we are just telling the compiler that instead of any resource get the metadata for the mapping from the POJO class itself like in this case it is
net.roseindia.Employee.

Note: Using annotations does not mean that you cannot give the hbm.xml file mappng. You can mix annotations and hbm.xml files mapping for different Pojo but you cannot mix the mappings for the same POJO in both ways.

Step 3:Developing a simple POJO

The major changes occurred only in the POJO files if you want to use the annotations as this is the file which will now contain the mapping of the properties with the database.

The following is the code for the Employee POJO.

package net.roseindia;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;