springBoot+thymeleaf访问时报错！！！！

Question

@RequestMapping("/")
public String index(){
        return "/helloThymeleaf";
}

@RequestMapping(value="/findDept",method=RequestMethod.POST)
public String findDept(Dept dept,Model model){
    System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!");
    Dept dept1 = deptDao.findByDeptNo(dept.getDeptNo());
    model.addAttribute("deptList",dept1);
    return "/helloThymeleaf";
}

输入localhost:8080后报错

报错信息

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'Dept' available as request attribute
at org.springframework.web.servlet.support.BindStatus.(BindStatus.java:144) ~[spring-webmvc-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.thymeleaf.spring4.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:401) ~[thymeleaf-spring4-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.spring4.util.FieldUtils.getBindStatus(FieldUtils.java:328) ~[thymeleaf-spring4-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.spring4.util.FieldUtils.getBindStatus(FieldUtils.java:294) ~[thymeleaf-spring4-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.spring4.processor.attr.AbstractSpringFieldAttrProcessor.processAttribute(AbstractSpringFieldAttrProcessor.java:98) ~[thymeleaf-spring4-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87) ~[thymeleaf-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212) ~[thymeleaf-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.dom.Node.applyNextProcessor(Node.java:1017) ~[thymeleaf-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.thymeleaf.dom.Node.processNode(Node.java:972) ~[thymeleaf-2.1.5.RELEASE.jar:2.1.5.RELEASE]

Answer 1

页面

名称