错误关于struts

type Exception report

message

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

exception

org.apache.jasper.JasperException: Exception creating bean of class app.LogonForm: {1} at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)         ...

root cause

javax.servlet.ServletException: Exception creating bean of class app.LogonForm: {1} at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:533) at org.apache.jsp.Logon_jsp._jspService(Logon_jsp.java:85) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)         ...
控制台消息：2005-9-19 9:35:30 org.apache.struts.util.RequestUtils createActionForm严重: Error creating form bean of class app.LogonFormjava.lang.NullPointerException        at org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:212)        at org.apache.struts.util.RequestUtils.createActionForm(RequestUtils.java:292)        at org.apache.struts.util.RequestUtils.createActionForm(RequestUtils.java:191)

问题原因：没的将编译的类放到 WEB-INF\classes\app\下面。