Simple JSF application is giving Jasper Exception citing Atribute name to be unique_问答_开发者

This is the Error log i got

   org.apache.jasper.JasperException: /pages/inputname.jsp (line: 3, column: 50) Attribute qualified names must be unique within an element
    org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
    or开发者_JS百科g.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
    org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:88)
    org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:171)
    org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:153)
    org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1236)
    org.apache.jasper.compiler.Parser.parseElements(Parser.java:1450)
    org.apache.jasper.compiler.Parser.parse(Parser.java:138)
    org.apache.jasper.compiler.ParserController.doParse(ParserController.java:239)
    org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:197)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:372)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:352)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:339)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:594)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:344)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:410)
    com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:469)
    com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:140)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
    org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:745)
    org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:716)
    org.apache.jsp.index_jsp._jspService(index_jsp.java:60)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

The code for the JSP page is

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<f:loadBundle var="test.bundle.messages" var="msg"/>

<html>
 <head>
  <title>enter your name page</title>
 </head>
 <body>
   <f:view>
     <h1>
      <h:outputText value="#{msg.inputname_header}"/>
     </h1>
     <h:form id="helloForm">
      <h:outputText value="#{msg.prompt}"/>
      <h:inputText value="#{personBean.personName}" />
      <h:commandButton action="greeting" value="#{msg.button_text}" />
     </h:form>
   </f:view>
 </body>
</html>

And for the messages.properties file it is

inputname_header=JSF KickStart
prompt=Tell us your name:
greeting_text=Welcome to JSF
button_text=Say Hello
sign=!

Whats going wrong here?

The error contains the line number and the character position:

/pages/inputname.jsp (line: 3, column: 50)

That's thus

        <f:loadBundle var="test.bundle.messages" var="msg"/>
-------------------------------------------------^

The error message says:

Attribute qualified names must be unique within an element

Look once again, you've declared var attribute twice. The first one should have been basename. Fix it accordingly:

        <f:loadBundle basename="test.bundle.messages" var="msg"/>

Unrelated to the concrete problem, since over 2.5 years ago JSF has been upgraded to JSF 2.0 and JSP has been succeeded by Facelets. I'd strongly recommend to refresh your course/learning materials/books/tutorials. They are out of date.