Connection cannot be null when 'hibernate.dialect' not set hibernate4 tomcat7

Question

I\'ve followed some tutorial in order to set up a web application using spring, hibernate to run on tomcat.

When trying to run my application I get the error \"Conne

Answer 1

Add this and check

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

Answer 2

Piece of code from the tutorial you mentioned:

    <bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
        <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
    </property>
</bean>

This is where hibernate.cfg.xml was specified and, also, where the dialect was put. If you have <property name="dataSource" ref="dataSource" /> for the session factory, you don't need it in the hibernate.cfg.xml. I would suggest looking again at that's tutorial source code and adjust your code accordingly.