运行时发现异常：Java.lang.IllegalArgumentException

Question

2009-6-17 11:15:48 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.IllegalArgumentException: Path showPic.jsp does not start with a "/" character
at org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:369)
at org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:196)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Answer 1

异常为 Path   logon.jsp   does   not   start   with   a   "/"   character   
要在struts-config.xml中修改
input="logon.jsp">　　＝＝＞input="/logon.jsp">        path="login"       ＝＝＞path="/login"  如： <action   
              attribute="addbookForm"   
              input="/logon"   
              name="addbookForm"   
              path="/logon.jsp"   
              scope="request"   
              type="classmate.action.AddbookAction">   
              <forward   name="success"   path="/login.jsp"   />   
</action>   其中<action>部分是说明action的属性。　　Path 指定Action处理的URL　　Type 指定Action的类名　　Name 指定Action主力的ActionForm名，与<form-beans >元素的name属性匹配。　　Scope 指定ActionForm存在的范围　　Input 指定包含客户提交表单的网页，如果ActionForm的Validate方法返回错误，则因该把用户请求转发到这个网页。　　Validate 如果取值为true，则表示ActionServlet应该调用ActionForm的validate方法　　Forward 就是Action的execute方法执行完毕后，把客户请求在转发给相应的页面。
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