After upgrading Hibernate version from 4.3.9.Final to 5.0.2.Final, Tomcat Server start-up time has increased.

After debugging, I realized that hibernate takes too much time in adding mapping locations (*.hbm.xml files) in its metadata sources.

I have added mapping location in session factory using following code, and in my project there are around 1000 hbm.xml files.

<bean id="baseSessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">

<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.jdbc.fetch_size">300</prop>
<prop key="net.sf.ehcache.configurationResourceName">/ehcache.xml</prop>
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
</props>
</property>

<property name="dataSource" ref="dataSource" />
<property name="mappingLocations">
<list>
<value>classpath*:com///.hbm.xml</value>
</list>
</property>
</bean>

While starting tomcat server, I debugged and fournd that in method

org.springframework.orm.hibernate5.LocalSessionFactoryBean.afterPropertiesSet

following for loop takes too much time to add all mapping locations in metadata sources object of configuration class.

if (this.mappingLocations != null) {
// Register given Hibernate mapping definitions, contained in resource files.
for (Resource resource : this.mappingLocations)

}

Issue:- Tomcat Server Time increased from appx. 3 minutes to 8 minutes after upgrading to Hibernate-5.0.2.Final.