[Struts]异常:java.lang.NullPointerException,JAVA方向的东西,怎么这么
点击右边红色标题查看本文完整版：[Struts]异常:java.lang.NullPointerException,JAVA方向的东西,怎么这么麻烦
不知道能不能解决
?
?
? <%@ page contentType="text/html;charset=GB2312" language="java" %>
? <%@ taglib uri="Struts-Html" prefix="html" %>
? <%@ taglib uri="Struts-Bean" prefix="bean" %>
? <%@ taglib uri="Struts-Logic" prefix="logic" %>
?
? <html:html locale="true">
? <head>
? <title><bean:message key="hello.jsp.title"/></title>
? <html:base/>
? </head>
? <body>
? <p><h2><bean:message key="hello.jsp.page.heading"/></h2></p>
? <p><html:errors/></p>
? <logic:present name="ch03.hello" scope="request">
? <h2>
? Hello <bean:write name="ch03.hello.HelloForm" property="person" />!
? </h2>
? </logic:present>
? <html:form action="/HelloWorld.do?action=goName" focus="person">
? <bean:message key="hello.jsp.prompt.person"/>
? <html:text property="person" size="16" maxlength="16"/><br>
? <html:submit property="submit" value="submit"/>
? <html:reset/>
? </html:form><br>
? <html:img page="/struts-power.gif" alt="[Struts]错误:java.lang.NullPointerException,JAVA方向的东西,如何这么" />
? </body>
? </html:html>
? 异常信息:
? exception
?
? org.apache.jasper.JasperException
? org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
? org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
? org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
? javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
? org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
?
?
? root cause
?
? java.lang.NullPointerException
? org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1219)
? org.apache.struts.taglib.TagUtils.message(TagUtils.java:1082)
? org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:226)
? org.apache.jsp.hello_jsp._jspx_meth_bean_message_0(org.apache.jsp.hello_jsp:173)
? org.apache.jsp.hello_jsp._jspx_meth_html_html_0(org.apache.jsp.hello_jsp:123)
? org.apache.jsp.hello_jsp._jspService(org.apache.jsp.hello_jsp:94)
? org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
? javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
? org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
? org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
? org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
? javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
? org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
?
?
? note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.
?
?
------解决方法--------------------
NullPointerException
? 是空指针错误，你的某个地方没判断是否为空。
------解决方法--------------------
变量初始化问题，变量为null的问题。
------解决方法--------------------
好像是这里的问题：
? <%@ taglib uri="Struts-Html" prefix="html" %>