我有一个使用 MySQL 在 Amazon EC2 上运行的 Spring Hibernate 应用程序。我正在考虑将我的应用程序移植到 Google App Engine，因为 Google 现在支持 MySQL 和 Google Can SQL。
因此，将我现有的应用程序配置为 Google App Engine Web 应用程序，然后编译代码没有任何错误。我没有对现有应用程序进行任何更改，它编译并创建了所需的表，服务器成功启动。
但是，当运行通过休眠访问数据库的应用程序时，我收到以下错误。
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection
at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:596)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy30.findById(Unknown Source)
at com.openentry.catgen.services.impl.WebsiteServiceImpl.getMasterDomain(WebsiteServiceImpl.java:99)
我正在为我的实体类使用注释。
有什么我需要改变的吗？
下面是我的 applicationContext.xml
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}" p:url="${jdbc.url}"
p:username="${jdbc.username}" p:password="${jdbc.password}" />
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
p:dataSource-ref="dataSource" p:configurationClass="org.hibernate.cfg.AnnotationConfiguration"
p:packagesToScan="com.package.app.entities">
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
<prop key="hibernate.connection.useUnicode">${hibernate.connection.useUnicode}</prop>
<prop key="hibernate.connection.characterEncoding">${hibernate.connection.characterEncoding}</prop>
<prop key="hibernate.connection.charSet">${hibernate.connection.charSet}</prop>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
</props>
</property>
</bean>
<tx:annotation-driven />
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory" />
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<constructor-arg>
<ref bean="sessionFactory" />
</constructor-arg>
</bean>