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).
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
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