Cambios en el archivo Persistence.xml

Cambios Persistence.xml

A.- Dialect : 

This:

    <persistence-unit name="default">
    	<provider>org.hibernate.ejb.HibernatePersistence</provider>
    	<non-jta-data-source>java:comp/env/jdbc/MySchoolDS</non-jta-data-source>
    	<class>org.openxava.session.GalleryImage</class>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
        </properties>
    </persistence-unit>
        
To :

    <persistence-unit name="default">
    	<provider>org.hibernate.ejb.HibernatePersistence</provider>
    	<non-jta-data-source>java:comp/env/jdbc/MySchoolDS</non-jta-data-source>
    	<class>org.openxava.session.GalleryImage</class>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
        </properties>
    </persistence-unit>

B.- hypersonic to mysql

Change the driverclass, dialect, url y add the user/password of database: 

This:
    <persistence-unit name="junit">
    	<provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
		<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
		<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
		<property name="hibernate.connection.url" value="jdbc:hsqldb:hsql://localhost:1666"/>
        </properties>
    </persistence-unit> 
        
To:

    <persistence-unit name="junit">
    	<provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
		<property name="connection.driver_class" value="com.mysql.jdbc.Driver" />
		<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
		<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/empresa"/>
		<property name="hibernate.connection.username" value="myuser"/>
		<property name="hibernate.connection.password" value="mypass"/>
        </properties>
    </persistence-unit>