Java EE (Java Enterprise Edition) General Discussion

Hi all,

I am trying to implement a custom "for loop tag". But it seems to me that there is a type conversion problem. I've tried many ways to fixed it but I still cannot get it to work. I've dug through my books, searched the internet and this forum but I can't found anythig useful. I am really lost now! Can anyone help me with this? Many many many thanks!!

loopTag.jsp

<%@ taglib prefix="myTag" uri="/WEB-INF/myTag.tld" %>
<% int num=5; %>

<myTag:loop index="i" count="<%=num%>">
	body1here: i expr: <%=i%> i property: <jsp:getProperty name="i" property="value"/> <br>
</myTag:loop>

myTag.tld

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
  <tlibversion>1.0</tlibversion>
  <jspversion>1.1</jspversion>
  <shortname>simple</shortname>
 
  <tag>
    <name>loop</name>
    <tagclass>myTag.LoopTag</tagclass>
    <bodycontent>JSP</bodycontent>
    <info>for loop</info>
    <attribute>
        <name>index</name>
        <required>true</required>
    </attribute>
    <attribute>
        <name>count</name>
        <required>true</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
</taglib>

LoopTag.java

package myTag;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.util.Hashtable;
import java.io.Writer;
import java.io.IOException;

public class LoopTag extends BodyTagSupport {    
    String index;
    int count;
    int i=0;

    public void setIndex(String index){
      this.index=index;
    }
    public void setCount(String count){
      this.count=Integer.parseInt(count);
    }

    public int doStartTag() throws JspException {
        return EVAL_BODY_TAG;
    }

    public void doInitBody() throws JspException {
        pageContext.setAttribute(index, i);
        i++;
    }
    
    public int doAfterBody() throws JspException {
        try {
            if (i >= count) {
               bodyContent.writeOut(bodyContent.getEnclosingWriter());
                return SKIP_BODY;
            } 
						else{
							pageContext.setAttribute(index, i);
						}
						i++;
            return EVAL_BODY_TAG;
        } 
				catch (IOException ex) {
            throw new JspTagException(ex.toString());
        }
    }
}

Error message:

type Exception report

message 

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

exception 

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 4 in the jsp file: /loopTag.jsp
Generated servlet error:
The method setCount(String) in the type LoopTag is not applicable for the arguments (int)

An error occurred at line: 5 in the jsp file: /loopTag.jsp
Generated servlet error:
i cannot be resolved


	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:409)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.11 logs.