RE: Unable to use request.getAttribute() in a JSP page

Ramakrishnan Venkataraman Mon, 17 Jul 2000 14:46:35 -0700

Title: RE: Unable to use request.getAttribute() in a JSP page

The forward does work, and the JSP page is called. It is with the JSP page that I have a problem. The JSP page with a <%=request.getAttribute()%> always returns a NullPointerException.

I am working around this problem by doing a response.redirect() from the servlet.

But this is think is inefficient, because it needs to bounce back from the browser.

- Venky

-----Original Message-----
From: W Raymond [mailto:[EMAIL PROTECTED]]
Sent: Friday, July 14, 2000 1:29 PM
To: jrun-talk
Subject: Re: Unable to use request.getAttribute() in a JSP page

request.setAttribute(X,Y) is v2 of the Servlet API

So, something like:

RequestDispatcher rd = this.getContext().getRequestDispatcher("/my/URL");

req.setAttribute("Z","AAAA");

rd.forward(req,resp);

should work.

----- Original Message -----
From: "Matt Senter" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 14, 2000 6:33 PM
Subject: RE: Unable to use request.getAttribute() in a JSP page

> Hmm, shouldn't it be session.getAttribute(<String>) as opposed to
> request.getAttribute(<String>)???
>
> -Matt
>
> -----Original Message-----
> From: Ramakrishnan Venkataraman [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, July 13, 2000 6:05 PM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: RE: Unable to use request.getAttribute() in a JSP page
>
>
> This message is in MIME format. Since your mail reader does not understand
> this format, some or all of this message may not be legible.
>
> ------_=_NextPart_001_01BFED2F.97228FF6
> Content-Type: text/plain;
> charset="windows-1252"
>
> Sorry, my typo(s).
>
> I am using a single argument to getAttribute()
>
> like this <%= request.getAttribute(<String>) %>
>
> Same goes for request.getParameter(<String>) (Only one argument)
>
> (Otherwise the JSP compile would have failed)
>
> The generated Java code looks like:
>
> out.print(request.getAttribute("sessionId"));
>
> I thought this should work, but obviously I have something wrong
somewhere.
>
>
> - Venky
>
> -----Original Message-----
> From: jim moore [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, July 13, 2000 12:39 PM
> To: jrun-talk
> Subject: RE: Unable to use request.getAttribute() in a JSP page
>
>
> getAttribute() takes only one parameter (a string): Object o =
> request.getAttribute(String name);
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Ramakrishnan
> Venkataraman
> Sent: Thursday, July 13, 2000 12:57 PM
> To: [EMAIL PROTECTED]
> Subject: Unable to use request.getAttribute() in a JSP page
>
>
> I am trying to forward a request from a servlet to a JSP.
>
> To pass information from the servlet to the JSP page, I use
> request.setAttribute(String, String) in the servlet.
>
> To call the JSP page I do:
>
> getServletConfig().getServletContext().getRequestDispatcher(<jsp
> page>).forward(request, response);
>
> But the JSP fails with the following error:
>
> ----------------------------------------------
> 500 Internal Server Error
> com.livesoftware.jsp.JSPServlet:
>
> java.lang.NullPointerException:
>
> ----------------------------------------------
>
> In the JSP page I have expressions like <%=request.getAttribute(String,
> String)%>.
>
> I also simply tried to call the JSP page from the browser, that also gives
> the same problem if I use <%=request.getAttribute(String, String)%> in the
> JSP page.
>
> (Incidentally if I do a redirect() to the JSP page passing a query string,
> it works correctly (of course, in the JSP I then use
> <%=request.getParameter(String, String)%> )
>
> I am using JRun 2.3.3 on Win NT 4.0 server.
>
> Any idea what I am doing wrong ?
>
> Thanks in advance for any pointers.
>
> - Ramakrishnan Venkataraman
> Email: [EMAIL PROTECTED]
>
> ------_=_NextPart_001_01BFECEB.4F433EE0
> Content-Type: text/html;
> charset="windows-1252"
> Content-Transfer-Encoding: quoted-printable
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
> <HTML>
> <HEAD>
> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
> charset=3Dwindows-1252">
> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
> 5.5.2651.65">
> <TITLE>Unable to use request.getAttribute() in a JSP page</TITLE>
> </HEAD>
> <BODY>
> 
>
> I am trying to forward a request from a servlet to a =
> JSP.
> 
>
> To pass information from the servlet to the JSP page, =
> I use request.setAttribute(String, String) in the servlet.
> 
>
> To call the JSP page I do: 
> 
>
>         SIZE=3D2>getServletConfig().getServletContext().getRequestDispatcher(&lt=
> ;jsp page>).forward(request, response); 
> 
>
> But the JSP fails with the following error:
> 
>
> ----------------------------------------------
> 500 Internal Server Error
> com.livesoftware.jsp.JSPServlet:
> 
>
> java.lang.NullPointerException: 
> 
>
> ----------------------------------------------
> 
>
> In the JSP page I have expressions like =
> <%=3Drequest.getAttribute(String, String)%>.
> 
>
> I also simply tried to call the JSP page from the =
> browser, that also gives the same problem if I use =
> <%=3Drequest.getAttribute(String, String)%> in the JSP =
> page.
>
> (Incidentally if I do a redirect() to the JSP page =
> passing a query string, it works correctly (of course, in the JSP I =
> then use <%=3Drequest.getParameter(String, String)%> )
>
> I am using JRun 2.3.3 on Win NT 4.0 server.
> 
>
> Any idea what I am doing wrong ?
> 
>
> Thanks in advance for any pointers.
> 
>
> - Ramakrishnan Venkataraman
>   Email: [EMAIL PROTECTED]
> 
>
> </BODY>
> </HTML>
> ------_=_NextPart_001_01BFECEB.4F433EE0--
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> --
> Archives: http://www.egroups.com/group/jrun-interest/
> Unsubscribe:
> http://www.houseoffusion.com/index.cfm?sidebar=lists&body=lists/jrun_talk
> or send a message to [EMAIL PROTECTED] with
'unsubscribe'
> in the body.
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> ------_=_NextPart_001_01BFED2F.97228FF6
> Content-Type: text/html;
> charset="windows-1252"
> Content-Transfer-Encoding: quoted-printable
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
> <HTML>
> <HEAD>
> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
> charset=3Dwindows-1252">
> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
> 5.5.2651.65">
> <TITLE>RE: Unable to use request.getAttribute() in a JSP page</TITLE>
> </HEAD>
> <BODY>
>
> Sorry, my typo(s). 
> 
>
> I am using a single argument to getAttribute()
> 
>
> like this       <%=3D =
> request.getAttribute(<String>) %>
> 
>
> Same goes for =
> request.getParameter(<String>)  (Only one argument)
> 
>
> (Otherwise the JSP compile would have failed)
> 
>
> The generated Java code looks like:
> 
>
>         SIZE=3D2>out.print(request.getAttribute("sessionId"));
> 
>
> I thought this should work, but obviously I have =
> something wrong somewhere.
> 
> 
>
> - Venky
> 
>
> -----Original Message-----
> From: jim moore [<A =
> HREF=3D"mailto:[EMAIL PROTECTED]">mailto:[EMAIL PROTECTED]</A>]<=
> /FONT>
> Sent: Thursday, July 13, 2000 12:39 PM
> To: jrun-talk
> Subject: RE: Unable to use request.getAttribute() in =
> a JSP page
> 
> 
>
> getAttribute() takes only one parameter (a string): =
> Object o =3D
> request.getAttribute(String name);
> 
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [<A =
> HREF=3D"mailto:[EMAIL PROTECTED]">mailto:JRun-Talk-req=
> [EMAIL PROTECTED]</A>]On Behalf Of Ramakrishnan
> Venkataraman
> Sent: Thursday, July 13, 2000 12:57 PM
> To: [EMAIL PROTECTED]
> Subject: Unable to use request.getAttribute() in a =
> JSP page
> 
> 
>
> I am trying to forward a request from a servlet to a =
> JSP.
> 
>
> To pass information from the servlet to the JSP page, =
> I use
> request.setAttribute(String, String) in the =
> servlet.
> 
>
> To call the JSP page I do:
> 
>
>         SIZE=3D2>getServletConfig().getServletContext().getRequestDispatcher(&lt=
> ;jsp
> page>).forward(request, response);
> 
>
> But the JSP fails with the following error:
> 
>
> ----------------------------------------------
> 500 Internal Server Error
> com.livesoftware.jsp.JSPServlet:
> 
>
> java.lang.NullPointerException:
> 
>
> ----------------------------------------------
> 
>
> In the JSP page I have expressions like =
> <%=3Drequest.getAttribute(String,
> String)%>.
> 
>
> I also simply tried to call the JSP page from the =
> browser, that also gives
> the same problem if I use =
> <%=3Drequest.getAttribute(String, String)%> in the
> JSP page.
> 
>
> (Incidentally if I do a redirect() to the JSP page =
> passing a query string,
> it works correctly (of course, in the JSP I then =
> use
> <%=3Drequest.getParameter(String, String)%> =
> )
> 
>
> I am using JRun 2.3.3 on Win NT 4.0 server.
> 
>
> Any idea what I am doing wrong ?
> 
>
> Thanks in advance for any pointers.
> 
>
> - Ramakrishnan Venkataraman
>   Email: [EMAIL PROTECTED]
> 
>
> ------_=3D_NextPart_001_01BFECEB.4F433EE0
> Content-Type: text/html;
>         SIZE=3D2>charset=3D"windows-1252"
> Content-Transfer-Encoding: quoted-printable
> 
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML =
> 3.2//EN">
> <HTML>
> <HEAD>
> <META HTTP-EQUIV=3D3D"Content-Type" =
> CONTENT=3D3D"text/html; =3D
> charset=3D3Dwindows-1252">
> <META NAME=3D3D"Generator" =
> CONTENT=3D3D"MS Exchange Server version =3D
> 5.5.2651.65">
> <TITLE>Unable to use request.getAttribute() in =
> a JSP page</TITLE>
> </HEAD>
> <BODY>
> 
> 
>
> I am trying to =
> forward a request from a servlet to a =3D
> JSP.
> 
> 
>
> To pass information =
> from the servlet to the JSP page, =3D
> I use request.setAttribute(String, String) in the =
> servlet.
> 
> 
>
> To call the JSP page =
> I do: 
> 
> 
>
> SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp=
> ;nbsp;&nbsp; 
> SIZE=3D2>SIZE=3D3D2>getServletConfig().getServletContext().getRequest=
> Dispatcher(&lt=3D
> ;jsp page&gt;).forward(request, response); =
> 
> 
> 
>
> But the JSP fails =
> with the following error:
> 
> 
>
> SIZE=3D3D2>----------------------------------------------</FONT&gt=
> ;
> 500 Internal Server =
> Error
> SIZE=3D3D2>com.livesoftware.jsp.JSPServlet:
> 
> 
>
> SIZE=3D3D2>java.lang.NullPointerException: 
> 
> 
>
> SIZE=3D3D2>----------------------------------------------</FONT&gt=
> ;
> 
> 
>
> In the JSP page I =
> have expressions like =3D
> &lt;%=3D3Drequest.getAttribute(String, =
> String)%&gt;.
> 
> 
>
> I also simply tried =
> to call the JSP page from the =3D
> browser, that also gives the same problem if I use =
> =3D
> &lt;%=3D3Drequest.getAttribute(String, =
> String)%&gt; in the JSP =3D
> page.
> 
>
> (Incidentally if I do =
> a redirect() to the JSP page =3D
> passing a query string, it works correctly (of =
> course, in the JSP I =3D
> then use &lt;%=3D3Drequest.getParameter(String, =
> String)%&gt; )
> 
>
> I am using JRun 2.3.3 =
> on Win NT 4.0 server.
> 
> 
>
> Any idea what I am =
> doing wrong ?
> 
> 
>
> Thanks in advance for =
> any pointers.
> 
> 
>
> - Ramakrishnan =
> Venkataraman
> &nbsp; Email: =
> [EMAIL PROTECTED]
> 
> 
>
> </BODY>
> </HTML>
> ------_=3D_NextPart_001_01BFECEB.4F433EE0--
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> --
> Archives: <A =
> HREF=3D"http://www.egroups.com/group/jrun-interest/" =
> TARGET=3D"_blank">http://www.egroups.com/group/jrun-interest/</A>=
>
> Unsubscribe:
> <A =
> HREF=3D"http://www.houseoffusion.com/index.cfm?sidebar=3Dlists&body=3Dli=
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RE: Unable to use request.getAttribute() in a JSP page

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