root cause

 org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.hs.model.StudentModel]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.hs.model.StudentModel.<init>()

     org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:108)

     org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:136)

     org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:81)

     org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:101)

     org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77)

     org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)

     org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:123)

     org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)

     org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)

     org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)

     org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)

     org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)

     org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)

     org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)

     org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:647)

     org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

     org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

     org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

 root cause

 java.lang.NoSuchMethodException: com.hs.model.StudentModel.<init>()

     java.lang.Class.getConstructor0(Class.java:2902)

     java.lang.Class.getDeclaredConstructor(Class.java:2066)

     org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:105)

     org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:136)

     org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:81)

     org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:101)

     org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77)

     org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)

     org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:123)

     org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)

     org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)

     org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)

     org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)

     org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)

     org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)

     org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)

     org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:647)

     org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

     org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

     org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

错误代码

有人说是实体类中没有无参构造方法

https://blog.csdn.net/zhengsaisai/article/details/79626895

新建无参构造器,结局问题

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