EDIT

    <bean id="jndiHibernateProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean" >

        <property name="locations" value="classpath:hibernate.properties"/>

        <property name="localOverride" value="false"/>

        <property name="properties">

             <!-- This configures default hibernate properties which can be overwritten 

                  by the properties defined in the hibernate.properties file 

             -->

#

# application properties to be applied to the jndiHibernateProperties which are configured in the 

# src/main/webapp/WEB-INF/datasources/configurable.xml file

#

# hibernate.hbm2ddl.auto - default: validate, options:  create | create-drop

# !!! must never be set to 'update' !!! 

#hibernate.hbm2ddl.auto=create-drop

# hibernate.show_sql - default: false

#hibernate.show_sql=true

# hibernate.format_sql - default: false

#hibernate.format_sql=true