Struts 的错误：Exception creating bean of class，如何解决？

码拜

10年 ago

我最近在编写基于Struts的程序的时候，运行一个jsp文件： <%@ page language=”java”%> <%@ taglib uri=”http://jakarta.apache.org/struts/tags-bean” prefix=”bean”%> <%@ taglib uri=”http://jakarta.apache.org/struts/tags-html” prefix=”html”%> <html> <head> <title>JSP for customerEditForm form</title> </head> <body> <html:form action=”/customerEdit”> <html:hidden property=”id”/> <html:hidden property=”do” value=”saveCustomer”/> Name: <html:text property=”name”/><br/> Last name <html:text property=”lastname”/><br/> Age <html:text property=”age”/><br/> <html:submit/><html:cancel/> </html:form> </body> </html> 出现下面的错误： description The server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: Exception creating bean of class de.laliluna.library.struts.form.CustomerEditForm: {1} org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867) org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800) org.apache.jsp.jsp.customerEdit_jsp._jspService(customerEdit_jsp.java:86) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069) org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507) javax.servlet.http.HttpServlet.service(HttpServlet.java:743) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) root cause javax.servlet.jsp.JspException: Exception creating bean of class de.laliluna.library.struts.form.CustomerEditForm: {1} org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:563) org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:520) org.apache.jsp.jsp.customerEdit_jsp._jspx_meth_html_form_0(customerEdit_jsp.java:101) org.apache.jsp.jsp.customerEdit_jsp._jspService(customerEdit_jsp.java:76) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069) org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507) javax.servlet.http.HttpServlet.service(HttpServlet.java:743) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 我用Goolge搜索，也看到很多人遇到，但是找不到解决的办法。我的代码的编写经过很仔细的检查，应该没有问题的，不知那位大侠遇到过？恳请指教！
	de.laliluna.library.struts.form.CustomerEditForm 这个类绝对有的，真是没有搞懂什么回事了。
	整了一个下午，终于知道为什么了：这些代码是根据struts-hibernate-integration-tutorial这个教程实现的源代码写成的，其中de.laliluna.library.struts.form.CustomerEditForm这个类的代码有错误： //Created by MyEclipse Struts //XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_3.8.2/xslt/JavaClass.xsl package de.laliluna.library.struts.form; import javax.servlet.http.HttpServletRequest; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionMapping; import de.laliluna.library.Customer; /** * MyEclipse Struts Creation date: 12-04-2004 * * XDoclet definition: * * @struts:form name=”customerEditForm” / public class CustomerEditForm extends ActionForm { private Customer customer; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 问题出在这里：customer没有初始化，因此没有办法对这个变量进行赋值的。只要改成： private Customer customer=new Customer(); 就OK了！！ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /* * @return Returns the customer. / public Customer getCustomer() { return customer; } /* * @param customer * The customer to set. / public void setCustomer(Customer customer) { this.customer = customer; } /* * Method reset * * @param mapping * @param request / public void reset(ActionMapping mapping, HttpServletRequest request) { customer = new Customer(); } / * (non-Javadoc) * * @see java.lang.Object#equals(java.lang.Object) / public boolean equals(Object arg0) { return customer.equals(arg0); } /* * @return / public Integer getAge() { return customer.getAge(); } /* * @return / public Integer getId() { return customer.getId(); } /* * @return / public String getLastname() { return customer.getLastname(); } /* * @return / public String getName() { return customer.getName(); } / * (non-Javadoc) * * @see java.lang.Object#hashCode() / public int hashCode() { return customer.hashCode(); } /* * @param age / public void setAge(Integer age) { customer.setAge(age); } /* * @param id / public void setId(Integer id) { customer.setId(id); } /* * @param lastname / public void setLastname(String lastname) { customer.setLastname(lastname); } /* * @param name / public void setName(String name) { customer.setName(name); } / * (non-Javadoc) * * @see java.lang.Object#toString() */ public String toString() { return customer.toString(); } }
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