SSH常见异常拾遗

SSH常见错误拾遗

? 转自:http://sslaowan.iteye.com/blog/119731

最近项目在用SSH，中间常会遇到一些错误，记录一下，以备查找。

1、找不到hibernate.cfg.xml

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is java.io.FileNotFoundException: class path resource [WEB-INF/classes/hibernate.cfg.xml] cannot be resolved to URL because it does not exist
java.io.FileNotFoundException: class path resource [WEB-INF/classes/hibernate.cfg.xml] cannot be resolved to URL because it does not exist

???????????这个问题是由于在applicationContext.xml中我们指定了hibernate.cfg.xml的位置，可是在运行JUnit进行单元测试和使用Tomcat运行时，这个路径是不一样的。因此就会报找不到这个文件的错误。

????

xml 代码

1. <bean?id="sessionFactory"?? ????????class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">??
2. ????<property?name="configLocation">?? ???????????????<value>/WEB-INF/classes/hibernate.cfg.xml?</value>??? ??
3. ?????????????????<!--??<value>/hibernate.cfg.xml</value>????-->? ?? ????</property>??
4. </bean>??

???????? 我现在的做法是：在Tomcat下进行测试时，使用上面没有注释掉的那个路径，当使用JUnit测试时，就使用下面注释掉的那个路径。

?

2、org.hibernate.MappingException: Unknown entity

org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity: DetailOfPlanForDayAndNight; nested exception is org.hibernate.MappingException: Unknown entity: DetailOfPlanForDayAndNight
org.hibernate.MappingException: Unknown entity: DetailOfPlanForDayAndNight

?? 从这个错误中，我才发现原来在下面这个方法中使用的那个字符串，是和配置文件对应的，具体如下：

java 代码

1. public?DetailOfPlanForDayAndNight?findById(DetailOfPlanForDayAndNightId?id)?{ ?? ????log.debug("getting?DetailOfPlanForDayAndNight?instance?with?id:?"?+?id); ??
2. ????try?{ ?? ????????DetailOfPlanForDayAndNight?instance?=?(DetailOfPlanForDayAndNight)?getHibernateTemplate() ??

????????????????.（1）get("DetailOfPlanForDayAndNight",?id); ??

????????return?instance; ??
1. ????}?catch?(RuntimeException?re)?{ ?? ????????log.error("get?failed",?re); ??
2. ????????throw?re; ?? ????} ??
3. }??

??? （1）中get("DetailOfPlanForDayAndNight",id)中的那个DetailOfPlanForDayAndNight是和下面的××.hbm.xml中的配置信息是对应的，我们的配置文件是：

???

xml 代码

1. <class?name="edu.bjtu.port.domain.DetailOfPlanForDayAndNight"?table="PD1_DNPLAN_DTL"?schema="SOMIS">?? ???????<composite-id?name="id"?class="edu.bjtu.port.domain.DetailOfPlanForDayAndNightId">??
2. ???????????<key-property?name="planId"?type="java.lang.String">?? ???????????????<column?name="DNPLANID"?length="8"?/>??
3. ???????????</key-property>?? ???????????<key-property?name="detailId"?type="java.lang.String">??
4. ???????????????<column?name="NO"?length="2"?/>?? ???????????</key-property>??
5. ???????</composite-id>??

????? class的name是edu.bjtu.port.domain.DetailOfPlanForDayAndNight，因此get中的那个字符串应该是edu.bjtu.port.domain.DetailOfPlanForDayAndNight，如下：

java 代码

1. DetailOfPlanForDayAndNight?instance?=?(DetailOfPlanForDayAndNight)?getHibernateTemplate() ?? ???????????????????.get("edu.bjtu.port.domain.DetailOfPlanForDayAndNight",?id);??

???? 这样就OK了。

我的异常网推荐解决方案：org.springframework.beans.factory.BeanCreationException:,http://www.myexception.cn/j2ee/10759.html

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