Използвам Hibernate (чрез JPA), конфигуриран от Spring, и когато стартирам приложението си (война, разгърната на Tomcat 6), получавам тази грешка:
org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set
Изглежда странно, защото съм задал диалекта за хибернация, както следва:
p:databasePlatform="org.hibernate.dialect.MySQL5Dialect
За повече информация, тук моето пълно приложениеContext.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="com.mysql.jdbc.Driver"
p:url="jdbc:mysql://localhost/room_management" p:username="root" p:password=""/>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="dataSource" p:persistenceUnitName="RoomManagement">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:database="MYSQL"
p:databasePlatform="org.hibernate.dialect.MySQL5Dialect"
p:showSql="true"/>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager"
p:entityManagerFactory-ref="entityManagerFactory"/>
<context:annotation-config/>
<context:component-scan base-package="com.parisdescartes.roommanagement.*"/>
<tx:annotation-driven/>
</beans>
Така че реших да прецизирам Hibernate Dialect във файла META-INF/persistence.xml и този път това работи. Ето как го прецизирах:
<properties>
<property name="hibernate.dialect"
value="org.hibernate.dialect.MySQL5Dialect"/>
</properties>
Имате ли представа защо Hibernate Dialect не е зададен с помощта на Spring конфигурация?