configuración hibernate

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
   version="1.0">

    <persistence-unit name="data">
        <properties>
            <property name="hibernate.archive.autodetection" value="class, hbm"/>

            <property name="hibernate.connection.driver_class" value="***********" />
            <property name="hibernate.connection.url" value="********"/>
            <property name="hibernate.connection.username" value="***"/>
            <property name="hibernate.connection.password" value="***" />


        <!-- JDBC connection pool (use the built-in) -->
            <property name="hibernate.connection.pool_size" value="1"/>

        <!-- SQL dialect -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect"/>

        <!-- Enable Hibernate's automatic session context management -->
            <property name="hibernate.current_session_context_class" value="thread"/>

        <!-- Disable the second-level cache  -->
            <property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>

        <!-- Echo all executed SQL to stdout -->
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="false"/>
            <property name="hibernate.use_sql_comments" value="true"/>


        <!-- Drop and re-create the database schema on startup -->
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>

        </properties>
    </persistence-unit>

</persistence>