DO NOT REPLY [Bug 17316] New: - taglib always returns null in first reocrd with pageContext.setAttribute

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=17316

taglib always returns null in first reocrd with pageContext.setAttribute

           Summary: taglib always returns null in first reocrd with
                    pageContext.setAttribute
           Product: Tomcat 4
           Version: 4.1.8
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: Normal
          Priority: Other
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: chenhong@iro.umontreal.ca


/*
the codes work well under tomcat 4.0, but in 4.1.18 (I use now), the function 
pageContext.setAttribute in the doStartTag always return null to the jsp page. 
but the pageContext.setAttribute in the doAfterBody works, so I get the first 
record null, and the others well.
*/


// file: Region.java
package ttt;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class Region extends BodyTagSupport {

 private java.sql.ResultSet rs = null;

 public int doStartTag() throws JspException  {
  int retVal = SKIP_BODY;
  try {
   DBO db = (DBO) pageContext.findAttribute("db"); //my connection pool
   String sql = "select * from region";
   this.rs = db.select(sql);
   if (this.rs.next()) {
    pageContext.setAttribute("id", this.rs.getString("id")); //***
    pageContext.setAttribute("name", this.rs.getString("name")); //***

/*
i'd checked the return from the database with:
 pageContext.getOut().print("Hello."+this.rs.getString("name"));
it works properly.
*/

    retVal = EVAL_BODY_INCLUDE;
   }
  } catch (java.sql.SQLException ignored) {}

  return retVal;
 }

 public int doAfterBody() throws JspException  {
  int retVal = SKIP_BODY;
  try {
   if (this.rs.next()) {
    pageContext.setAttribute("id", this.rs.getString("id"));
    pageContext.setAttribute("name", this.rs.getString("name"));
    retVal = EVAL_BODY_AGAIN;
   }
  } catch (java.sql.SQLException ignored) {}
  return retVal;
 }
}


// file RegionEx.java

/*
anothe problem in extrainfo:
Cannot return the type exclude the "String", the following codes can be 
complied, but will cause a "can not complie the jsp exception" when i run the 
jsp file:
 String type = data.getAttributeString("type");
 if (type == null) type = "java.lang.Object";
  return new VariableInfo[] {
   new VariableInfo(data.getAttributeString("id"), type, true, 
VariableInfo.NESTED),
   new VariableInfo(data.getAttributeString("name"), type, true, 
VariableInfo.NESTED)
  };

so, have to return "String" for all the data type?

*/

package ttt;

import javax.servlet.jsp.tagext.*;

public class RegionEx extends TagExtraInfo {
    public VariableInfo[] getVariableInfo(TagData data) {
        return new VariableInfo[] {
            new VariableInfo("id", "String", true, VariableInfo.NESTED),
            new VariableInfo("name", "String", true, VariableInfo.NESTED),
        };
    }
}

//the jsp page.

<table>
<ttt:region>
<tr><td><%= name %></td><td><%= id %></td></tr>
</ttt:region>
</table>

// the tld file

<?xml version="1.0" encoding="UTF-8"?>
<!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>1.2</tlib-version>
	<jsp-version>1.2</jsp-version>
	<short-name>ttt</short-name>

	<tag>
		<name>region</name>
		<tag-class>ttt.Region</tag-class>
		<tei-class>ttt.RegionEx</tei-class>
		<body-content>JSP</body-content>
	</tag>

</taglib>

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