Struts开发异常-2

HTTP Status 500 -

---

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /form/user.jsp at line 13

10: 		<div style="border: 1px dashed red">${message }</div>
11: 		<html:form action="/user">
12: 			username : <html:text property="user.name"/><br/>
13: 			userpwd : <html:text property="userinfo.pwd"/><br/>
14: 			<html:submit value="LOGIN"/>
15: 		</html:form>
16: 	</body>


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:519)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

 

root cause

javax.servlet.ServletException: javax.servlet.jsp.JspException: No getter method for property userinfo.pwd of bean org.apache.struts.taglib.html.BEAN
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:865)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:794)
	org.apache.jsp.form.user_jsp._jspService(user_jsp.java:86)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

 

root cause

javax.servlet.jsp.JspException: No getter method for property userinfo.pwd of bean org.apache.struts.taglib.html.BEAN
	org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:973)
	org.apache.struts.taglib.html.BaseFieldTag.prepareValue(BaseFieldTag.java:121)
	org.apache.struts.taglib.html.BaseFieldTag.renderInputElement(BaseFieldTag.java:102)
	org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:81)
	org.apache.jsp.form.user_jsp._jspx_meth_html_005ftext_005f1(user_jsp.java:162)
	org.apache.jsp.form.user_jsp._jspx_meth_html_005fform_005f0(user_jsp.java:112)
	org.apache.jsp.form.user_jsp._jspService(user_jsp.java:76)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

 

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.

---

Apache Tomcat/6.0.32

-------------------------------------------------------------------------------------------------

分析了很多原因~

这报错的原因是：ActionForm 的实现中和JSP不统一。因为 userinfo.pwd 会被解析为 getUserinfo.getPwd 这样的嵌套语句，这些和Actionform中是统一的，这是面向对象的一个特征之一~

看来得注意统一性问题，当然，透彻了解Struts 标签库原理才是，最终的办法~

 

以下是错误出错比对~

这是JSP中的 Struts 标签 

11: <html:form action="/user">
12: username : <html:text property="user.name"/><br/>
13: userpwd : <html:text property="userinfo.pwd"/><br/>
14: <html:submit value="LOGIN"/>
15: </html:form>

 

这是ActionForm 定义

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.yourcompany.struts.form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import com.entity.Userinfo;

/**
 * MyEclipse Struts
 * Creation date: 09-20-2011
 *
 * XDoclet definition:
 * @struts.form name="userForm"
 */
public class UserForm extends ActionForm {
 /*
  * Generated fields
  */

 /** user property */
 private Userinfo user;

 /*
  * Generated Methods
  */

 /**
  * Method validate
  * @param mapping
  * @param request
  * @return ActionErrors
  */
 public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {
  // TODO Auto-generated method stub
  return null;
 }

 /**
  * Method reset
  * @param mapping
  * @param request
  */
 public void reset(ActionMapping mapping, HttpServletRequest request) {
  // TODO Auto-generated method stub
 }

 /**
  * Returns the user.
  * @return Userinfo
  */
 public Userinfo getUser() {
  return user;
 }

 /**
  * Set the user.
  * @param user The user to set
  */
 public void setUser(Userinfo user) {
  this.user = user;
 }
}