启动出现了错误，请问该怎么解决？

Question

rg.springframework.beans.factory.BeanCreationException:Error creating bean with name 'authenticationProcessingFilterEntryPoint' defined in ServletContext resource [/WEB-INF/classes/spring/applicationContext-security.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint]: No default constructor found; nested exception is java.lang.NoSuchMethodException: org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint.<init>()at

Answer 1

这个报错描述主要是这么两句：

1. Error creating bean with name 'authenticationProcessingFilterEntryPoint' defined in ServletContext resource [/WEB-INF/classes/spring/applicationContext-security.xml]

   这说明创建失败是因为创建一个叫authenticationProcessingFilterEntryPoint的bean失败了，这个bean配置在applicationContext-security.xml，此时你就可以先从这个描述找到配置文件，然后找到相应的类

2. No default constructor found; nested exception is java.lang.NoSuchMethodException: org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint.<init>()

   LoginUrlAuthenticationEntryPoint
   

   失败的类叫LoginUrlAuthenticationEntryPoint，然后是没有默认的构造函数

所以建议你先给LoginUrlAuthenticationEntryPoint加一个默认的空的构造函数，再启动试试