SSH集成各种错误

BeanCreationException:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: Dialect class not found: MySQL5InnoDBDialect

.....

Caused by: java.lang.ClassNotFoundException: MySQL5InnoDBDialect

解决办法: ctrl+shift+T 如果找到MySQL5InnoDBDialect 则检查 jdbc.properties

如果没找到,先导入需要的包在检查

出错原因:一般是没有导入MySQL5InnoDBDialect或者是其 权限名写错了.

错误总结: 只要是指明类,就一定给其全限定名

 BeanCreationException:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao' defined in class path resource [beans.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'sessionFactory' or 'hibernateTemplate' is required

Caused by: java.lang.IllegalArgumentException: 'sessionFactory' or 'hibernateTemplate' is required

出错原因: 配置dao时没有为其引入sessionFactory

解决办法:<p:bean id="AGenericDao" abstract="true">

<p:property name="sessionFactory" ref="sessionFactory"></p:property>

</p:bean>

总结: 采用spring进行管理的时候,必须要注意bean下面必须注入的依赖

 

TransientObjectException:

org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: cn.welcone.pss.domain.Department; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - 

Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: cn.welcone.pss.domain.Department

 

 出错原因:在没有开启spring事务之前,如果直接进行dao测试,对于有关联的对象的存储的时候会出现该异常

解决办法: 在hibernate映射文件 <many-to-one 属性中添加级联: 

<many-to-one name="department" class="cn.welcone.pss.domain.Department" column="dept_id" cascade="save-update"/>

总结:在映射有关联关系的对象时,必须要注意级联和关系的维护,谁是主动关联谁来维护