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taglib嵌套报错,求救!

所属目录：Java | 类型：技术问答 | 时间：2007-05-21

问题：

全部代码如下,内容比较多:
package jsp;

import java.io.ioexception;
import javax.servlet.jsp.jspexception;
import javax.servlet.jsp.tagext.bodytagsupport;
import org.apache.taglibs.standard.lang.support.expressionevaluatormanager;

public class tag3 extends bodytagsupport
{
private object value = null;
private object output = null;

public void setoutput(object output)
{
this.output = output;
}
public object getvalue()
{
return value;
}
public void setvalue(object value)throws jspexception
{
this.value = expressionevaluatormanager.evaluate(
"value", value.tostring(), object.class, this, pagecontext);
}
public int dostarttag()
{
return eval_body_include;
}
public int doendtag()throws jspexception
{
try
{
pagecontext.getout().print(output);
}
catch (ioexception e)
{
throw new jspexception(e);
}
return eval_page;
}
}
--------------------------------------------
package jsp;

import javax.servlet.jsp.jspexception;
import javax.servlet.jsp.tagext.bodytagsupport;
import org.apache.commons.beanutils.propertyutils;

public class tag4 extends bodytagsupport
{
private string property = null;

public void setproperty(string property)
{
this.property = property;
}

public int doendtag()throws jspexception
{
tag3 parent =(tag3)getparent();
if(parent==null)
throw new jspexception("can not find parent tag ");
try
{
object propertyvalue = propertyutils.getproperty(parent.getvalue(), property);
parent.setoutput(propertyvalue);
}
catch (exception e)
{
throw new jspexception(e);
}
return eval_page;
}
}
-----------------------------------------
package jsp.vo;

public class man
{
private string name = null;
private int age = 0;
public static string tou(string s) {
return s;
}

public int getage()
{
return age;
}
public void setage(int age)
{
this.age = age;
}
public string getname()
{
return name;
}
public void setname(string name)
{
this.name = name;
}
}
------------------------------------------
<?xml version="1.0" encoding="iso-8859-1" ?>
<!doctype taglib
public "-//sun microsystems, inc.//dtd jsp tag library 1.2//en"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>gq</short-name>

<tag>
<name>with</name>
<tag-class>jsp.tag3</tag-class>
<body-content>jsp</body-content>
<attribute>
<name>value</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>

<tag>
<name>nestedout</name>
<tag-class>jsp.tag4</tag-class>
<body-content>empty</body-content>
<attribute>
<name>property</name>
<required>false</required>
<rtexprvalue>false</rtexprvalue>
</attribute>
</tag>
</taglib>
----------------------------------------
<%@ page contenttype="text/html;charset=gbk"%>
<%@ page import="jsp.vo.man"%>
<%@ taglib uri="/web-inf/tlds/gq.tld" prefix="gq"%>
<%
man man = new man();
man.setname("gq");
request.setattribute("man",man);
%>
<gq:with value="${man}">
<gq:nestedout property="name"/>
</gq:with>
---------------------------------------
运行jsp报错信息:
javax.servlet.servletexception: javax.servlet.jsp.jspexception: unknown property name
org.apache.jasper.runtime.pagecontextimpl.dohandlepageexception(pagecontextimpl.java:821)
org.apache.jasper.runtime.pagecontextimpl.handlepageexception(pagecontextimpl.java:758)
org.apache.jsp.jsp.jstl_jsp._jspservice(jstl_jsp.java:80)
org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:94)
javax.servlet.http.httpservlet.service(httpservlet.java:810)
org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:324)
org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:292)
org.apache.jasper.servlet.jspservlet.service(jspservlet.java:236)
javax.servlet.http.httpservlet.service(httpservlet.java:810)
org.jboss.web.tomcat.filters.replyheaderfilter.dofilter(replyheaderfilter.java:75)

root cause

java.lang.nosuchmethodexception: unknown property name
org.apache.commons.beanutils.propertyutils.getsimpleproperty(propertyutils.java:1175)
org.apache.commons.beanutils.propertyutils.getnestedproperty(propertyutils.java:772)
org.apache.commons.beanutils.propertyutils.getproperty(propertyutils.java:801)
jsp.tag4.doendtag(tag4.java:27)
org.apache.jsp.jsp.jstl_jsp._jspx_meth_gq_nestedout_0(jstl_jsp.java:134)
org.apache.jsp.jsp.jstl_jsp._jspx_meth_gq_with_0(jstl_jsp.java:107)
org.apache.jsp.jsp.jstl_jsp._jspservice(jstl_jsp.java:71)
org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:94)
javax.servlet.http.httpservlet.service(httpservlet.java:810)
org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:324)
org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:292)
org.apache.jasper.servlet.jspservlet.service(jspservlet.java:236)
javax.servlet.http.httpservlet.service(httpservlet.java:810)
org.jboss.web.tomcat.filters.replyheaderfilter.dofilter(replyheaderfilter.java:75)

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