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初学jsf，自制的标签使用时报错？解决办法

www.myexceptions.net  网友分享于：2013-09-12  浏览：10次

初学jsf，自制的标签使用时报错？

访问MyJsf页面出错，错误信息如下：

type   Exception   report

message

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

exception

org.apache.jasper.JasperException

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)

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)

com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)

com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:147)

com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)

com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)

com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)

javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)

root   cause

java.lang.ClassCastException

cn.pj.tags.pjlabelTag.setProperties(pjlabelTag.java:37)

javax.faces.webapp.UIComponentTag.findComponent(UIComponentTag.java:705)

javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:423)

org.apache.jsp.MyJsp_jsp._jspx_meth_pj_mylabeltag_0(MyJsp_jsp.java:85)

org.apache.jsp.MyJsp_jsp._jspService(MyJsp_jsp.java:60)

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)

com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)

com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:147)

com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)

com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)

com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)

javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)

note   The   full   stack   trace   of   the   root   cause   is   available   in   the   Tomcat   logs.

在下初学者，这个问题查资料，调试，弄了一天，一直搞不定，只好向各位高手请教了！谢谢！

1   开发工具：eclipse＋myeclipes＋tomcate

2   项目结构如下

myface

--src

--cn

--pj

--tags

-pjlabelComponent.java

-pjlabelTag.java

--WebRoot

--WEB-INF

--classes

--...(省略)

--lib

-commons-beanutils.jar

-commons-collections.jar

-commons-digester.jar

-commons-logging.jar

-jsf-api.jar

-jsf-impl.jar

-jstl.jar

-standard.jar

-faces-config.xml

-mytag.tld

-web.xml

-MyJsp.jsp

3   pjlabelComponent.java如下：

package   cn.pj.tags;

import   java.io.IOException;

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