java Bean创建异常
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Bean creation exception
提问by JNPW
My application context looks likt this,
我的应用程序上下文看起来像这样，
<bean id="caseTxBo" class="gov.case.rcp.bo.impl.caseTxBoImpl" >
<property name="caseTxDao" ref="caseTxDao" />
</bean>
<bean id="caseTxDao" class="gov.case.rcp.dao.impl.caseTxDaoImpl" >
<property name="sessionFactory" ref="sessionFactory" />
Action class gets the context like this:
Action 类获取上下文如下：
ServletContext context = request.getSession().getServletContext();
BeanFactory factory = WebApplicationContextUtils.
getRequiredWebApplicationContext(context);
CaseTxBOImpl caseTxBo = (
caseTxBoImpl) factory.getBean("caseTxBo");
List<caseTxPmt> errorVarList =
caseTxBo.getcaseTxDao().findAllcaseTx();
model.put("caseTxList", caseTxList);
BOImpl implements Dao and DAOImpl implements Dao:
BOImpl 实现了 Dao，DAOImpl 实现了 Dao：
DaoImpl has the implementation and returns caseTxList.
DaoImpl 有实现并返回 caseTxList。
but I get a runTimeException as
但我得到一个 runTimeException 作为
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'caseTxBo' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Cannot resolve reference to bean 'caseTxDao' while setting bean property 'caseTxDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'caseTxDao' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'sessionFactory' of bean class [gov.case.rcp.pp.dao.impl.CaseTxDaoImpl]: Bean property 'sessionFactory' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
follows:
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:275)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:104)
Where did i go wrong?
我哪里做错了？
回答by Tomasz Nurkiewicz
Bean property
'sessionFactory'is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? follows: atorg.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:275)
Bean 属性
'sessionFactory'不可写或具有无效的 setter 方法。setter 的参数类型是否与 getter 的返回类型匹配？如下： 在org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:275)
The error message is pretty clear. Open your CaseTxDaoImpland make sure there is a following method there:
错误信息非常清楚。打开您的CaseTxDaoImpl并确保那里有以下方法：
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
BTW this:
顺便说一句：
ServletContext context = request.getSession().getServletContext();
BeanFactory factory = WebApplicationContextUtils.
getRequiredWebApplicationContext(context);
factory.getBean("caseTxBo")
is pretty low-level usage of Spring and an anti-pattern. Are you using any web framework? Typically they integrate with Spring quite well.
是 Spring 的低级用法和反模式。你在使用任何网络框架吗？通常，它们与 Spring 集成得很好。
