Trouble forwarding request from a servlet to a JSP in OAS 4.0.8.1 on NT

The OJSP release notes state that:
"Servlets and JSP cannot coexist as the same application" and "Requests cannot be passed between two separate applications."
Does this mean that my attempts to use the
the servlet RequestDispatcher to forward a request to a JSP are futile? If so, is this a problem that will be fixed in the future? I would like to use this feature!
This is the code (based on a sample from Sun's JSWDK 1.0.1) that doesn't work:
servletToJsp.java
import javax.servlet.*;
import javax.servlet.http.*;
public class servletToJsp extends HttpServlet {
public void doGet (HttpServletRequest request,
HttpServletResponse response) {
try {
getServletConfig().getServletContext().getRequestDispatcher("/jsp/jsptoserv/hello.jsp").forward(request, response);
} catch (Exception ex) {
ex.printStackTrace ();
I am able to use the <jsp:forward page="/servlets/servletToJsp" /> directive to go from a JSP page to a servlet (across two OAS Applications) and I also can forward a request via the dispatcher from one servlet to another in the same OAS application.
Any help in this area would be appreciated. Thanks.

I'm using OAS 4.0.8.1
You mean servlet to JSP does not work and JSP to servlet works for you????Yes - but I've only tried very simply examples.
That's different from my understanding. If you are using OAS 4081, both cases should not work.
The problem you mentioned will be fixed in future release of OAS.That's good to know - thanks!
null

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Challenge forwarding from a servlet to a JSP

Redirecting information from a servlet to a JSP
Hello Everyone,
     I am processing the contents of a html form using a servlet. After processing the
information received and storing it into a javabean I am trying to pass control onto a jsp for
display. At this stage the jsp does not display as desired due to a URL challenge. The URL
which references my jsp is:
http://localhot/ferngully/prefset.jspThis url has been designated to the jsp page 'prefset.jsp' by the application specific web.xml
file (...I am using Tomcat 5!), the relevant contents of which follow:
<servlet>
     <servlet-name>PreferenceSet</servlet-name>
     <jsp-file>/prefset.jsp</jsp-file>
</servlet>
<servlet-mapping>
     <servlet-name>PreferenceSet</servlet-name>
     <url-pattern>/ferngully/prefset.jsp</url-pattern>
</servlet-mapping>If I access the page with the afore mentioned URL it displays correctly. However the URL which
is returned to the browser after the servlet has forwarded control to the JSP is:
http://localhost/ferngully/ferngully/PreferencesThe following form markup is used to access the servlet:
<form name="form1" method="post" action="ferngully/Preferences"> I know that I have mapped the servlet correctly because the servlet performs it's programatic tasks happily :)
I am using code within the servlet to forward control to the JSP, and I believe that this is the crux of my challenge.
The code for the servlet is listed below.
package userpreferences;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class PreferencesServlet extends HttpServlet
     public void init(ServletConfig config) throws ServletException
          super.init(config);
     public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
          doPost(request, response);
     public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
          String url = "/prefset.jsp";
          ServletContext servCont = getServletContext();
          RequestDispatcher reqDispatch = servCont.getRequestDispatcher(url);
          reqDispatch.forward(request, response);
}I believe that the above highlighted code section is responsible for my challenge. I have tried changing the String url to "/ferngully/prefset.jsp",
however there was no improvement in functionality.
Can somebody please explain to me how I can go about directing the control of this process from the servlet to the jsp correctly? Particularly
how I can go about making the url returned to the client correct for accessing the jsp page? Do I need to delete the mapping entry for the
jsp page in web.xml? I am new to servlets & jsp so any help will be much appreciated.
Thanks
Kind Regards
Davo

3. >The following form markup is used to access the servlet:
<form name="form1" method="post" action="ferngully/Preferences">Question 1:
     why do you specify your contextname in action attribute again ?
     General funda about urls:
     When you have an index.html loaded through http://localhost/index.html, then a link in that html whose url is,
     1. say, preferences.html (no forward slashes preffixed or suffixed) would load the html from the same folder.
     2. say, /ferngully/prefences.html, would attempt to load a html from the ferngully folder that is a sub-directory
of your web-application
     3. say, /ferngully/prefences.jsp, would attempt to load a html from the ferngully folder that is a sub-directory
of your web-application
     When you have a servlet whose url-pattern is set to intercept requests, it would intercept requests that have that
pattern it is defined to intercept in web.xml (for example all the above requests in 1,2 and 3 would be intercepted
by a servlet whose pattern is ferngully/*)
     Now if your action is not a specific resource (.jsp or .html), something like /preferences, this would map to a url
/ferngully/preferences. (for which a resource should be defined in web.xml - either a servlet or a jsp)
However the URL which is returned to the browser after the servlet has forwarded control to the JSP is:
http://localhost/ferngully/ferngully/PreferencesTell us the url of the original html
I know that I have mapped the servlet correctly because the servlet performs it's programatic tasks happily :)Tell us the url-appetrn of the servlet that intercepted your request
Particularly
how I can go about making the url returned to the client correct for accessing the jsp page?The url in the browser is always the request url, you cannot change it to the url of the jsp even which rendered the page
through a fwd from the servlet.
Do I need to delete the mapping entry for the
jsp page in web.xml?Not necessary. You can access the jsp directly from the servlet while forwarding by
1. specifying the exact path to the jsp. For example if the jsp is under a folder called jsps, your request dispatcher
url ought to be /jsps/prefset.jsp
2. specifying the jsp's url-pattern as specified in web.xml
Questions Contd
2. Why does the url pattern have to have a .jsp suffixed.
From your code
<url-pattern>/ferngully/prefset.jsp</url-pattern>It could equally well have been
<url-pattern>/ferngully/prefset</url-pattern>And then your servlet would have to forward it to ("/ferngully/prefset")
2. Your jsp-file mapping is in this form
<jsp-file>/prefset.jsp</jsp-file>This assumes that the jsp is in the top-level folder of your web-application and not under
any sub-directories. Correct ?
cheers,
ram.

Send some atributes from a Servlet to a JSP program

Hi all,
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"Rajiv" == Rajiv <[email protected]> writes:
                    Rajiv> Hi all,
          Rajiv> I am quite new to JSP programming and am facing a problem. I have a
          Rajiv> Servlet code which is supposed to send some attributes to a JSP, which
          Rajiv> will display the attribute that has been passed through the Servlet.
          Rajiv> the Servlet code to do so is,
          Rajiv> {
          Rajiv> request.setAttribute("emailtxt","emailNewTxt");
          Rajiv> RequestDispatcher rd=request.getRequestDispatche("/emailChangeSuc.jsp");
          Rajiv> rd.forward(request,response);
          Rajiv> }
          Rajiv> on the JSP side, I am reciving this attribute in the following way,
          Rajiv> <body>
          Rajiv> <%@content_type="text/html"%>
          Rajiv> <%! String emailTxt=HttpSession.getAttribute("emailNewTxt");%>
          Rajiv> and am displaying the value in this way
          Rajiv> <b><%=emailTxt%>
          Rajiv> but I am getting an error
          Rajiv> "non-static method getAttribute(java.lang.String) cannot be referenced
          Rajiv> from a static context
          Rajiv> probably occurred due to an error in /emailChangeSuc.jsp line 9:
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          First of all, you put the attribute into the request, but you're trying to read
          it from the session. Change it to "request.getAttribute(...".
          Second, your compile error is stating that the "getAttribute()" method of
          HttpSession is not a static method. If you really needed to reference the
          session, it would just be "session". Changing to "request" as in the first
          point, will avoid this problem.
          Third, remove the "!" from the scriptlet which declares and sets the "emailTxt"
          variable. That makes it declare an instance variable instead of a local
          variable. That will cause numerous problems with this.
          ===================================================================
          David M. Karr ; Java/J2EE/XML/Unix/C++
          [email protected] ; SCJP; SCWCD

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............

I would suggest that you use the Servlet to retrieve the data you are after and store it in the session. Then forward the user onto the JSP page where it can retrieve the object from the session and present it to the user in a formatted view.

How do I Display a string from a servlet into a JSP Page???? NEED HELP!!!!

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hmmm, I dont really like using JSP programming, u should be using JAVA..
the way to do it is:
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Send Get request from a servlet.

Is it possible to send parameters from one servlet to another by using get? I don't want to use Post because the servlet recieving the parameters already has the post method doing something else. Any ideas?

May you can use the RequestDispatcher for your use.
Doc:
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The servlet container creates the RequestDispatcher
object, which is used as a wrapper around a server
resource located at a particular path or given by a
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We need to direct requests from internet to our content server which is in the intranet (so that the content server images can be seen from the internet).
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>
Ghochi Elin Kuswoyo wrote:
> hi guys,
>
> you need to add parameter in your sapwebdisp.pfl (sap webdispatcher profile) :
>
> icm/HTTP/redirect_0 = PREFIX=/,TO=/path_image
>
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I cannot get you the detailed confguration, but you can refer to web dispatcher cascade configuration. play with the following parameters:
wdisp/server_info_location
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>
Cons wrote:
> So in short, get your networking guys to do this, SAP cannot help in any way.
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Cheers,
Denny
Edited by: Denny Liao on Jan 28, 2010 11:26 PM

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Trouble forwarding request from a servlet to a JSP in OAS 4.0.8.1 on NT

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