configuring Hibernate (JPA) ImprovedNamingStrategy which prefers embedded underscores to mixed case names

applicationContext-persistence.xml

	<bean id="entityManagerFactory"
		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
				<property name="showSql" value="true" />
				<property name="databasePlatform" value="${hibernate.databasePlatform}" />
			</bean>
		</property>
		<property name="jpaProperties">
			<props>
				<prop key="hibernate.format_sql">true</prop>
				<prop key="hibernate.hbm2ddl.auto">create-drop</prop> <!-- create | create-drop | validate | update -->
				<prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
			</props>
		</property>
	</bean>

It is the behavior of the org.hibernate.cfg.ImprovedNamingStrategy , which will convert the mixed case names to the embedded underscores name . http://docs.jboss.org/hibernate/core/3.5/api/org/hibernate/cfg/ImprovedNamingStrategy.html . So if you explicitly use the name "EventLog" , it will convert to the "event_log" .

If you simply want to use the name explicitly specified in the @table , you should use the org.hibernate.cfg.DefaultNamingStrategy . By default it is used when you instantiate your org.hibernate.cfg.Configuration object

more informations,
http://stackoverflow.com/questions/5050538/hibernate-improvednamingstrategy-overrides-table-name-in-entity