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From "Martin Cooper" <martin.coo...@tumbleweed.com>
Subject RE: PageContext is always null with taglibs
Date Fri, 13 Sep 2002 00:13:03 GMT
If you think it might be a Tomcat configuration problem, then why not try
dropping in something that's known to work, and see if it works for you? You
could try the JSTL examples, or the struts-example.war web app from Struts
1.1-b2.

--
Martin Cooper


> -----Original Message-----
> From: Byrne Reese [mailto:byrne@majordojo.com]
> Sent: Thursday, September 12, 2002 5:00 PM
> To: Tag Libraries Users List
> Subject: RE: PageContext is always null with taglibs
> 
> 
> On Thu, 2002-09-12 at 16:45, Martin Cooper wrote:
> > Are you absolutely certain that pageContext is null, and 
> that the problem is
> > not caused by either 'getId()' or 'city' being null? You're 
> not checking
> > those before passing them to pageContext.
> > 
> > Custom tags work just fine in Tomcat 4.0.4, so I think the 
> problem must be
> > somewhere in your own tag code.
> > 
> > --
> > Martin Cooper
> 
> So I actually only enclosed a code snippet... I did several variations
> while unit testing - and even tried to implement a simple HelloWorld
> TagSupport class... but with no luck. :(
> 
> I just seems odd since at one point it was working... but that was a
> while ago, and I am kicking myself because I am not sure what on my
> system changed other than Tomcat... well I did upgrade Axis Beta 3 to
> RC1, but I can't see how that could possibly impact the JSP layer in
> anyway.
> 
> I also tried reverting to an older servlet.jar class - but still, no
> luck. Perhaps there is some configuration parameter in Tomcat I am
> missing? Jeeesh, who knows?
> 
> > > -----Original Message-----
> > > From: Byrne Reese [mailto:byrne@majordojo.com]
> > > Sent: Thursday, September 12, 2002 4:00 AM
> > > To: taglibs-user@jakarta.apache.org
> > > Subject: PageContext is always null with taglibs
> > > 
> > > 
> > > I am trying to write a custom taglib that extends the 
> > > TagSupport class. 
> > > 
> > > At one point my implementation worked, but when upgrading 
> to Tomcat
> > > 4.0.4, I keep getting a NullPointerException because the protected
> > > variable pageContext is null.
> > > 
> > > Any clues? Is tomcat's servlet implementation no longer 
> setting the
> > > PageContext? What gives? Or how do I get a handle to the 
> > > request and/or
> > > response context so that I can get and put attributes and 
> write output
> > > to the browser?
> > > 
> > > Here is my code BTW:
> > > 
> > > JSP:
> > > --------------------------------------------------------------
> > > -----------
> > > 
> > > <otg:getCity id="city"
> > > cityId="/world/south_america/bolivia/cobija_city"/>
> > > 
> > > <p>City Name: <jsp:getProperty name="city" property="name"/></p>
> > > 
> > > 
> > > CLASS:
> > > --------------------------------------------------------------
> > > -----------
> > > public class GetCityTag extends TagSupport {
> > >         
> > >     /* blah blah blah */
> > >     
> > >     public int doEndTag() 
> > >         throws JspException 
> > >     {
> > >         City city = (City)getCity(getCityId());
> > >         /* this next line is where the 
> NullPointerException occurs */
> > >         pageContext.setAttribute(getId(), city);
> > >         /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
> > >         try {
> > >             pageContext.getOut().write("City id is " + 
> cityId + "!");
> > >             pageContext.getOut().write("Storing fetched city
> > > '"+city.getName()+
> > >                               "' as " + id + "!");
> > >         } catch(IOException e) {
> > >             throw new JspTagException("An IOException occurred.");
> > >         }
> > >         return EVAL_PAGE;
> > >     }
> > >     
> > > }
> > > 
> > > 
> > > --
> > > To unsubscribe, e-mail:   
> > > <mailto:taglibs-user-unsubscribe@jakarta.apache.org>
> > > For additional commands, e-mail: 
> > > <mailto:taglibs-user-help@jakarta.apache.org>
> > > 
> > > 
> > 
> > 
> > --
> > To unsubscribe, e-mail:   
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> > For additional commands, e-mail: 
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> > 
> 
> 
> --
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> 
> 


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