我正在尝试学习Spring MVC，当尝试从Internet上获取样本时，出现以下错误:
HTTP Status 500 - Unable to compile class for JSP
type Exception report
message Unable to compile class for JSP
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:600)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NullPointerException
org.apache.tomcat.util.descriptor.tld.TldResourcePath.hashCode(TldResourcePath.java:164)
java.util.HashMap.hash(HashMap.java:338)
java.util.HashMap.get(HashMap.java:556)
这是我的JSP页面:
<%@taglib uri="www.springframework.org/tags/form" prefix="form" %>
<html>
<head>
<title>Admission Form</title>
</head>
<body>
<h1>${header_msg}</h1>
<h3>Admission Form for Engineering Courses</h3>
<form:errors path="student1.*" />
<form action="/Admissions/submitAdmissionForm.html" method="post">
<table>
<tr><td> Student's Name : </td><td> <input type="text" name="studentName" /> </td></tr>
<tr><td> Student's Hobby : </td><td> <input type="text" name="studentHobby" /> </td></tr>
<tr><td> Date of Birth : </td><td> <input type="text" name="studentDOB" /> </td></tr>
<tr><td> Mobile No : </td><td> <input type="text" name="studentMobile" /> </td></tr>
<tr><td> Skill set : </td><td> <select name="studentSkills" multiple>
<option value="Core Java">Core Java</option>
<option value="Spring Core">Spring Core</option>
<option value="Spring MVC">Spring MVC</option>
</select> </td></tr>
</table>
<table>
<tr><td> Address : </td></tr>
<tr><td> Country: <input type="text" name="studentAddress.country" /> </td>
<td> City: <input type="text" name="studentAddress.city" /> </td>
<td> Street: <input type="text" name="studentAddress.street" /> </td>
<td> Pin code: <input type="text" name="studentAddress.pincode" /> </td></tr>
<tr><td> </td><td> <input type="submit" value="Submit this form" /> </td></tr>
</table>
</form>
</body>
</html>
我的 Controller 类包含以下代码:
@ModelAttribute
public void addingCommonObjects(ModelAndView model) {
model.addObject("header_msg", "College of Engineering, Adoor");
}
@RequestMapping(value="/submitAdmissionForm.html", method=RequestMethod.POST)
public ModelAndView submitAdmissionForm(@ModelAttribute("student1") Student student, BindingResult result) {
if(result.hasErrors()) {
ModelAndView model = new ModelAndView("AdmissionForm");
return model;
}
ModelAndView model = new ModelAndView("AdmissionFormSuccess");
return model;
}
在 Controller 中添加
BindingResult以及在JSP页面中添加<form:errors>之前，一切工作正常。当你们看的时候，这可能是代码中的一个小问题，但是我一直在尝试找出最近3-4天的问题。
请提出建议。
最佳答案
<%@taglib uri="www.springframework.org/tags/form" prefix="form" %>
uri在以上行中不正确。 uri中缺少 http 。尝试下面
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
关于forms - <％@ taglib uri =“www.springframework.org/tags/form”前缀=“form”％> <form :errors path =“student1.*” /> causing “Unable to compile JSP page” error，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34036324/