由index.jsp 跳转到 save.jsp 除此错，地址栏显示是正确的localhost:8080/struts/index.jsp to localhost:8080/struts/save.jsp
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:538)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:430)
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)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)
root cause
java.lang.NullPointerException
org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:746)
org.apache.struts2.components.UIBean.end(UIBean.java:481)
org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:43)
org.apache.jsp.save_jsp._jspx_meth_s_005ftextfield_005f0(save_jsp.java:162)
org.apache.jsp.save_jsp._jspx_meth_s_005fform_005f0(save_jsp.java:117)
org.apache.jsp.save_jsp._jspService(save_jsp.java:79)
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:388)
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)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.33 logs.
Apache Tomcat/6.0.33
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java.lang.NullPointerException
空指针异常
org.apache.jsp.save_jsp._jspx_meth_s_005ftextfield_005f0(save_jsp.java:162)
org.apache.jsp.save_jsp._jspx_meth_s_005fform_005f0(save_jsp.java:117)
org.apache.jsp.save_jsp._jspService(save_jsp.java:79)
你好好检查一下save页面参数的值
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user对象是空的吧。
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User user=new User（） 實例化
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为user加一个空的构造方法，否则struts无法帮你实例化，当然你也可以自己new一个出来
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UserService service 有可能为空。用debug呀
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对付空指针 一直觉得好办法就是把可能空的地方断点 debug一下
可以看api
代码迷推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.daimami.com/search?q=317