Nauman Rafique wrote:
>
> Hi,
> I am using my custom tag to add an attribute in the page context. I want to
> use this attribute as a script variable in my page. In my tag, i increment
> this variable and my tag iterate and display this variable. But the value of
> the variable is not incremented even though i add the incremented value in
> page context too. It displays the value i added in the context first (not
> the incremented value).
At a quick glance, your tag handler code looks okay to me. It may be a bug in
the JSP container you're using. Try using VariableInfo.NESTED instead of
VariableInfo.AT_BEGIN. Both should work, but NESTED is more common for this
type of tag handler, so a bug related to AT_BEGIN may not have been discovered
by the container developers.
Hans
> I am using a session EJB which is added in page context by another tag. The
> name of bean is counter. The method increment() increment the internal
> variable of EJB and return the value of count which is then stored in local
> variable count and added in page context.
>
> The code of my tag hanlder is
>
> package jsptoejb;
>
> import javax.ejb.EJBObject;
> import javax.servlet.jsp.*;
> import javax.servlet.jsp.tagext.*;
> import countejb.*;
>
> public class Iterator extends BodyTagSupport
> {
> private int maxcount;
> CountRemote counter;
>
> public void setIterationCount(String count1)
> {
> maxcount = Integer.parseInt(count1);
> }
>
> public int doStartTag() throws JspTagException
> {
> int count;
> try
> {
> counter =
> (countejb.CountRemote)super.pageContext.getAttribute("EJBObject");
> count = counter.getcount();
>
> //Here I first set the attribute
> pageContext.setAttribute("count", new Integer(count));
> return EVAL_BODY_TAG;
> }
> catch(Exception e)
> {
> throw new JspTagException(e.toString());
> }
> }
>
> public void doInitBody()
> {
> }
>
> public int doAfterBody()
> throws JspTagException
> {
>
> try
> {
> int count = counter.getcount();
> BodyContent body = getBodyContent();
> if( count< maxcount)
> {
> body.println(" In do after body" + count);
> count = counter.increment();
> // Here i again set the attribute
> pageContext.setAttribute("count", new Integer(count));
> return EVAL_BODY_TAG;
> }
> else
> {
> body.writeOut(getPreviousOut());
> return SKIP_BODY;
> }
> }
> catch(Exception e)
> {
> throw new JspTagException(String.valueOf(String.valueOf((new
> StringBuffer("The exception ")).append(e).append("was thrown"))));
> }
> }
>
> public int doEngTag()
> throws JspTagException
> {
> try
> {
> counter.remove();
> }
> catch(Exception e)
> {
> throw new JspTagException(e.toString());
> }
> return EVAL_PAGE;
> }
> }
>
> And the code of my jsp is
>
> <%@ page import="countejb.*, jsptoejb.*,javax.naming.* " %>
> <HTML>
> <HEAD>
> <TITLE>
> SampleJsp
> </TITLE>
> </HEAD>
> <BODY>
> <H1>
> Jsp to play with EJBs
> </H1>
>
> <%@ taglib uri="taglib.tld" prefix="ejb"%>
> The trace of the program is printed here
> <ejb:getejb nick="mycounter" initialCount="5">
> <ejb:iterate>
> The current value of count is <%=count>
> </ejb:iterate>
> </ejb:getejb>
>
> </BODY>
> </HTML>
>
> The code of my extra info class is
>
> package jsptoejb;
>
> import javax.servlet.jsp.tagext.*;
>
> public class IteratorExtraInfo extends TagExtraInfo
> {
> public VariableInfo[] getVariableInfo(TagData data)
> {
> // System.out.println("I am being used");
> return new VariableInfo[]
> {
> new
> VariableInfo("count","Integer",true,VariableInfo.AT_BEGIN)
> };
> }
> }
>
> Here is the corresponding entry in tag library descriptor:
>
> <tag>
> <name>iterate</name>
> <tagclass>jsptoejb.Iterator</tagclass>
> <teiclass>jsptoejb.IteratorExtraInfo</teiclass>
> <bodycontent>JSP</bodycontent>
> <attribute>
> <name>iterationCount</name>
> <required>true</required>
> </attribute>
> </tag>
>
> Plz find the bug and tell me ...
> Thanks in advance
>
> Nauman
--
Hans Bergsten [EMAIL PROTECTED]
Gefion Software http://www.gefionsoftware.com
Author of JavaServer Pages (O'Reilly), http://TheJSPBook.com
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