org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMapping' defined in ServletContext resource [/WEB-INF/web-config.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userAction' defined in ServletContext resource [/WEB-INF/web-config.xml]: Cannot resolve reference to bean 'userService' while setting bean property 'userService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService' defined in ServletContext resource [/WEB-INF/service-config.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.sxt.service.UserService]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userAction' defined in ServletContext resource [/WEB-INF/web-config.xml]: Cannot resolve reference to bean 'userService' while setting bean property 'userService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService' defined in ServletContext resource [/WEB-INF/service-config.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.sxt.service.UserService]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService' defined in ServletContext resource [/WEB-INF/service-config.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.sxt.service.UserService]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.sxt.service.UserService]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
2016-9-6 16:42:53 org.apache.catalina.core.StandardContext loadOnStartup
严重: Servlet /spmvc01 threw load() exception
org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.sxt.service.UserService]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
解决办法：
看错误，从最底层看，最后一个cause by，因为如果最底层出错，上面的也会出错，因为代码是从最底层往上注入的，下面的错了，上面的也就错了，所以先看最底层的。
看到最底层，发现，UserService类中有无效的setter方法，查看UserService，发现里面的set方法确实有问题，忘记写参数了。
一般，get和set方法的生成，最好自动生成，因为自己写的话，容易出错。自动生成的办法： 在代码空白处右击-Source-Generate Getters and Setters，然后选择需要生成的方法即可。