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Posted to users@tomcat.apache.org by Hiroshi Iwatani <HG...@nifty.ne.jp> on 2004/06/28 00:32:34 UTC
Tag handler can't evaluate EL

Tomcat 5.0.19 can run the following tag, but can't assgin or evaluate values
to/from EL variable. So, Tomcat output is:

${a1}
${a1}
${a1}

while expected output is:

a
b
c

Resin and JRun can do the expected behavior.

---tag handler------------------------------------------------------------
package mytag;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;
import javax.servlet.http.*;
import java.util.*;

public class foreach extends BodyTagSupport{
   private Iterator iterator;
   private String group;

   public void setGroup(String group){
     this.group = group;
   }

   public  String getGroup(){
     return group;
   }

   public int doStartTag() throws JspException{
     try{
       String[] intarray = new String[] {"a","b","c"};
       ArrayList ar = new ArrayList(Arrays.asList(intarray));
       iterator = ar.iterator();

       if (iterator.hasNext()){
         String o = (String)iterator.next();
         pageContext.setAttribute("a1", o);
         return EVAL_BODY_BUFFERED;
       }
       else{
        return SKIP_BODY;
       }
     }
     catch (Exception e){
       System.err.println(e);
     }
     return SKIP_BODY;
   }

   public int doAfterBody() throws JspException{
     try{
       if (iterator == null){
         return SKIP_BODY;
       }
       if (iterator.hasNext()) {
         String o = (String)iterator.next();
         pageContext.setAttribute("a1", o);
         return EVAL_BODY_AGAIN;
       }
       else{
         return SKIP_BODY;
       }
     }
     catch (Exception e){
       System.err.println(e);
     }
     return SKIP_BODY;
   }

   public int doEndTag() throws JspException {
     try {
       pageContext.getOut().print(bodyContent.getString());
     }
     catch(Exception ioe) {
       System.out.println(ioe);
     }
     return EVAL_PAGE;
   }
}

--test.jsp-----------------------------------------------------------
<%@ page contentType="text/html" %>
<%@ taglib prefix="jrun" uri="/WEB-INF/mytag.tld" %>
<html><body bgcolor="lightgreen">
<hr>
[Tag Test]<br>
<jrun:foreach group="itemsql">
${a1}<br>
</jrun:foreach>
<hr>
This is another test<br>
<jrun:foreach group="itemsql">
${a1}<br>
</jrun:foreach>
<hr>
This bad boy!<br>
<jrun:foreach group="itemsql">
${a1}<br>
</jrun:foreach>
<hr></body></html>

--TLD----------------------------------------------------------------
<?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>

   <tag>
     <name>foreach</name>
     <tag-class>mytag.foreach</tag-class>
     <body-content>JSP</body-content>
     <attribute>
       <name>group</name>
       <required>true</required>
       <rtexprvalue>true</rtexprvalue>
     </attribute>
   </tag>

</taglib>
-----------------------------------------------------------------

-- 
Hiroshi Iwatani

*stop cruelty* Annual number of institutionally euthanized cats and dogs
including kittens and puppies: US 5 million, JP 500 thousand. How about your
country? *for our better karma*
---------------------


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