How to forward from a servlet to a (secured) jsp

hi all
actually i am trying to forward a request from a servlet to a jsp which is located in the WEB-INF-directory of the web-app...
as i read in the docs the path in the getRequestDispatcher-method must start with a "/" so i tried to get a requestDispatcher-object from this path:
/WEB-INF/secureJSP/abc.jsp...
but all i get is a FileNotFoundException: no ressource "..." in the servlet context root "..."
if i put the jsp in the web-app-root (like /abc.jsp) i am able to get a requestDispatcher-object without troubles...
whats wrong? any ideas?
tia
sandro

Hi
Let me clarify this for you, Firstly as I said the WEB-INF directory is not accessible to the browser i.e a user couldn't possibly type in http://server-name:port-number/myapp/WEB-INF/test.jsp - This wouldn't work. But what you can do is forward a request to the jsp through a servlet using the RequestDispatcher.
The RequestDispatcher object can be obtained in two ways. One is from the servletContext and the other is from the request. If it is obtained from the servletContext then the path is interpreted relative to the root of the web application. If it is got from the request without the "/" then the path is interpreted relative to the current request servicing resource.
In your case get the RequestDispatcher from the ServletContext and provide the path as you have provided - assuming that WEB-INF directory is just below your myapp directory.
Keep me posted on your progress & sorry for the confusion.
Good Luck!
Eshwar Rao
Developer Technical Support
Sun microsystems inc
http://www.sun.com/developers/support

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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
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package userpreferences;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
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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:
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     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/*)
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/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.

How to write from a servlet to it's war file?

We need to be able to write a file from a servlet into the document root
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Thanks for your help. Not to beat this to death but say I want a response that
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          Kirk
          Cameron Purdy wrote:
          > Hi Kirk,
          >
          > Yes, you can accomplish all of those things without writing files out.
          > Writing files will severely degrade performance in many cases, and will lead
          > to certain classes of bugs such as those caused by multiple browsers within
          > the same process or rampant use of "back" lists. (That's a long-winded way
          > of saying persistent state on the server that reflects a client's transient
          > state has a way of being wrong, sooner or later.)
          >
          > All you have to do is return a URL that includes the necessary information
          > to get the picture. You do that now by creating a random thingamabob name:
          >
          > http://www.mysite.com/myapp/thisisarandomname12345.jpg
          >
          > Instead of random, try:
          >
          > http://www.mysite.com/myapp/thisisthepictureforemployee-17.jpg
          >
          > The issues are the same (someone trying to guess URLs) but you do have the
          > problem that the URLs are easier to guess because they follow a pattern.
          > You should secure-check each request anyway. (Lots of tricks for making
          > that very efficient, but that is a book in itself.)
          >
          > So what serves up the .jpg? A Servlet!!! It gets the request, builds (or
          > reads from db or whatever) the .jpg image and streams it out. Now you get
          > 3-4 times the performance and a much more orderly arrangement of URLs etc.
          > that can now be "saved" and "bookmarked" etc. Also no congested temp dirs
          > etc.
          >
          > Peace,
          >
          > --
          > Cameron Purdy
          > Tangosol, Inc.
          > http://www.tangosol.com
          > Tangosol Server: Enabling enterprise application customization
          >
          > "Kirk Everett" <[email protected]> wrote in message
          > news:[email protected]...
          > > What I want to do is one one servlet request generate an image file in the
          > doc
          > > root and then return a page back to the browser that contains an image tag
          > > referring to the generated image file. I also want to be able to generate
          > a file
          > > of data based on a user's posted selections and then present them with a
          > link to
          > > download the file. If I don't write these to disk in the docroot how
          > would I
          > > give the user a link to them? Is there a better way? Thanks for your
          > help.
          > >
          > > Kirk
          > >
          > > Cameron Purdy wrote:
          > >
          > > > Yes, if you have to write a file (either because you expect it to be
          > used
          > > > many times or you wish to assemble a huge (>1mb) response without using
          > > > memory), then do so to a temp or working dir. There is no reason to use
          > the
          > > > doc root at all for that, other than to use FileServlet, which is eaily
          > > > replicated for your own specific purposes. For the most part, there is
          > no
          > > > reason to write the file, since you can write the response back to the
          > > > browser just as easily as to a file.
          > > >
          > > > Peace,
          > > >
          > > > --
          > > > Cameron Purdy
          > > > Tangosol, Inc.
          > > > http://www.tangosol.com
          > > > +1.617.623.5782
          > > > WebLogic Consulting Available
          > > >
          > > > "Kirk Everett" <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > I agree that in general this should be avoided but we have two cases
          > where
          > > > we
          > > > > need to write a file to the
          > > > > the document root. The first is we allow the user to generate a file
          > and
          > > > > download it to thier machine. So in
          > > > > one servlet the user selects the data and submits the form. The
          > servlet
          > > > then
          > > > > writes a file to the docroot and
          > > > > the user is then presented a link where they can download the file.
          > The
          > > > second
          > > > > is when we want to generate
          > > > > a chart image in a gif. The servlet writes the image to the docroot
          > and
          > > > another
          > > > > JSP refers to the image in an
          > > > > image tag. In both cases we are using mangled names and we clean up
          > the
          > > > files.
          > > > > Do you have a better solution?
          > > > > Thanks for your help.
          > > > >
          > > > > Cameron Purdy wrote:
          > > > >
          > > > > > Writing to a deployed application is generally a thing to be
          > avoided.
          > > > Among
          > > > > > other things, it is a potential security issue. Apps should be able
          > to
          > > > be
          > > > > > locked down (no OS write access except non-exec temp space). I
          > suggest
          > > > not
          > > > > > doing writes if at all avoidable. What are you trying to
          > accomplish?
          > > > > > Perhaps stream back a big file?
          > > > > >
          > > > > > Peace,
          > > > > >
          > > > > > --
          > > > > > Cameron Purdy
          > > > > > Tangosol, Inc.
          > > > > > http://www.tangosol.com
          > > > > > +1.617.623.5782
          > > > > > WebLogic Consulting Available
          > > > > >
          > > > > > "Kirk Everett" <[email protected]> wrote in message
          > > > > > news:[email protected]...
          > > > > > > We need to be able to write a file from a servlet into the
          > document
          > > > root
          > > > > > > area to it can be accessed by a browser. Before we used war files,
          > we
          > > > > > > would simply figure out the real document root directory and write
          > the
          > > > > > > file somewhere under it. How would I do this when my application
          > is
          > > > > > > packaged as a war? I don't see a way to write to a "xxx.war" file
          > and
          > > > > > > if we run from an exploded war, how do I determine the location of
          > the
          > > > > > > document root at runtime from the servlet? I don't want to have
          > to
          > > > hard
          > > > > > > code the path or make each installation specifiy it in a
          > properties
          > > > > > > file. It seems there should be a better way to handle this. Any
          > > > ideas?
          > > > > > >
          > > > >
          > >

How to navigate from a Servlet to a WebDynpro?

Hi together,
I've the following Problem:
On the same EP, there are 2 deployed components:
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Question:
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Regard
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Hi Thomas,
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Hi everybody
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Hi
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Developer Technical Support
Sun microsystems inc
http://www.sun.com/developers/support

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                    page.forward(req, res);
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          doPost(req,res);
}

req.getParameter("book1") is not NULL and returning the value of the checkbox "book1". The problem occurs when the back button is press and try to retrieve the session value in the JSP. At that time, session.getAttribute("book1") returns NULL.
But if i convert the servlet to JSP then everything is working fine.
So i wanted to know if there is anything wrong in the way i store the session value in the servlet and forwarding to the JSP.
Thanks

How to forward from a jsp to another jsp on another server

I am facing issue in forwarding to a jsp residing in another server. While using response.redirect(url), the response is send back to the browser and then redirected(which is not expected as it would create problem in production). i am facing issue while using the <jsp: forward> tag and forward() as they seem to be taking relative URL. Please help me with this issue.

probably, you could use <c:redirect url=""/> tag to request to jsp on another server and pass ur parameters as 'GET' so that u can get all your respective params values. Other way (or crude) way is to do a scoket or HttpConnection to post your all datas via 'POST' and expect respective values on the server side.

How to forward from proxy

When you are writing a proxy; after having intercepted the request/response. Two questions:
1. if you intercepted a request and you did what you had to do; to forward the request, do you just have to open a socket connection to the web server on port 80 and send the request line per line using PrintWriter?
2. if you intercepted a reply , you just have to open a socket connection to the client on the 'proxy port' (e.g. 8080) and again send the reply line per line with PrintWriter?
Or am I getting it completely wrong?
thanks

can u send me the .java files of the prog
[email protected]

How to ask for a servlet response into a JSP?

Hi guys,
I have the following problem. I developed a servlet able to return a string with some information.
I would like to see this information from a JSP page. In other words, I would like to encapsule in the jsp page, the info requested to the servlet.
Is it possible? In this case the servlet returns a piece of HTML text. If there is a way, could it be possible to use the same mechanism for a JSP to ask a servlet to include a picture in the page?
Many thanks
/Massimo

maxqua72 wrote:
Hi guys,
I have the following problem. I developed a servlet able to return a string with some information.
I would like to see this information from a JSP page. In other words, I would like to encapsule in the jsp page, the info requested to the servlet.Just put the result in the request scope and forward the request to the JSP.
Is it possible? In this case the servlet returns a piece of HTML text. E.g.
protected void doGet(HttpServletRequest request, HttpServletResponse response) {
    String result = "<b>result</b>";
    request.setAttribute("result", result);
    request.getRequestDispatcher("page.jsp").forward(request, response);
}page.jsp<p>Result is: ${result}</p>If the servlet actually writes HTML to its response (not so nice) then you can use <jsp:include/> to include it in your JSP page.
If you want to do it all asynchronously, then indeed consider AJAX.
If there is a way, could it be possible to use the same mechanism for a JSP to ask a servlet to include a picture in the page?Write an independent servlet for that. You may find this article useful: [http://balusc.blogspot.com/2007/04/imageservlet.html].

Forward from action directly to anther action

Hi all,
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The problem what I would like to solve is the following:
I have some information stored on a DB. Depending of these information I would like to show different information on a jsp page with the help of jsf. (This jsp file is reached already with the help of navigation rules of jsf technology)
An action bean class is instantiated already when the generation of my jsp file started and the information are stored on this object in member variables. There is a boolean variable among these stored information and if the value of it is true, then I would like to send the user "automatically" to another jsp file (using the navigation rules of jsf).
If I would not use jsf, then I would do something like the following:
I would store the value of the boolean variable into the session, and I would use a jstl "if " tag to ask the value of this variable and when it would be true then I would use a <jsp:forward...> to send the user to the next page.
My problem is I can not solve this with the jsf navigation rules?
If I try to do something similar with jsf than #{myClass.newPage} is not accepted by jsp:forward tag of course, but I do not know a solution instead of it in jsf.
Is exist a solution in jsf for it?
If not, how can I create a similar sequence?
vikot

Passing parameter to a jsp from a servlet

Hi,
I need to pass a parameter from a servlet to a jsp without using the session object. Is it possible? I've been looking for a method like response.setParameter but it doesn't exist.
Please help !!!

Actually, there is no setParameter method in the ServletRequetsObject. Still, you can create one. This can be usefull when you have a jsp that get its parameters from either a direct html form posting or a forward from a servlet. This can be achieved using wrappers, instead of the real request object.
It's not really tricky, it's only a little "underknown" feature.
Here is a sample code when you can fake the settings of requets parameters :
public class MyRequest extends HttpServletRequestWrapper {
   private HashMap fakedParameters;
   public MyRequest(HttpServletRequest nested) {
      super(this);
      fakedParameters=new HashMap();
    public void setParameter(String key,String value) {
        fakedParameters.put(key,value);
    public String getParameter(String name) {
       String res=fakedParameter.get(name):
       if (res==null)
           res=super.getParameter(name);
       return res;
}NB: this is a sample, you may also override other method (such as getParameterNames) for a full featuerd wrapped request.
Now, you can use your wrapped request :
MyRequest req2=new MyRequest(request);
RequestDispatcher dispatcher=request.getRequestDispatcher("/somePage.jsp");
req2.setParameter("name","yourName");
dispatcher.formard(req2,response);Hope it helps.

Servlet passing values to JSP and ClasscastException

I am using weblogic 5.1 to run my Servlets.
          I want to know when I forward from a servlet to a JSP how do I pass
          values especially Java Objects (Sometimes Objects of User written Java
          classes).
          Uptil now I have been putting all values in the session from where the
          JSP picks them up, but somehow I have a feeling that this is not the
          right way.
          In a code I am putting a Java Object (It contains two attributes of
          Java.util.Vector type) in the session so that the JSP to which I am
          forwarding it to can use it I have put my class in the ServletClasses.
          Intertestingly it runs well till the contents of the Vector are changed.
          As the contents of the vector are changed, it throws ClassCastException
          The StackTrace is as follows:
          java.lang.ClassCastException
          at
          jsp_servlet._select_95_account_95_profile._jspService(_select_95_account_95_pro
          file.java, Compiled Code)
          at weblogic.servlet.jsp.JspBase.service(JspBase.java, Compiled
          Code)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java,
          C
          ompiled Code)
          at
          weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.j
          ava:143)
          at
          com.logistics.optistopasp.servlet.AccountSelectServlet.doPost(AccountSelectServ
          let.java, Compiled Code)
          at
          com.logistics.optistopasp.servlet.AccountSelectServlet.doGet(AccountSelectServl
          et.java:35)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java,
          C
          ompiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.j
          ava, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.j
          ava, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextMan
          ager.java, Compiled Code)
          at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java,
          Compile
          d Code)
          at
          weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java,
          Compiled Code
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java,
          Compiled Code)
          Can anybody please Help!!!!.
          Thanks
          Pankaj


Only can confirm your finding - the jsp is using a different class loader to the servlet that originally instantiated the object. There's the rub. I haven't figured out yet how to fix that. I can get the classloader but don't know how to get the runtime to use that class loader to perform cast.

Servlet passing Values to JSP

I want to know when I forward from a servlet to a JSP how do I pass
          values especially Java Objects (Sometimes Objects of User written Java
          classes).
          Uptil now I have been putting all values in the session from where the
          JSP picks them up, but somehow I have a feeling that this is not the
          right way.
          Suppose my servlet is forwarding to a jsp . What should it do in case an
          exception happens in the servlet and wants to forward it to the jsp.
          Putting the Exception object in the session is an alternative but I
          wonder that is the best approach.
          If someone knows a better way od doing it, please help.
          Pankaj


You could probably use setAttribute
          ..before forwarding the control to JSP.
          req.setAttribute("message", "Hello, world");
          ServletContext app = getServletContext();
          RequestDispatcher disp;
          disp = app.getRequestDispatcher("Dispmessage.jsp");
          Cheers,
          Naggi
          pankaj wrote:
          > I want to know when I forward from a servlet to a JSP how do I pass
          > values especially Java Objects (Sometimes Objects of User written Java
          > classes).
          > Uptil now I have been putting all values in the session from where the
          > JSP picks them up, but somehow I have a feeling that this is not the
          > right way.
          > Suppose my servlet is forwarding to a jsp . What should it do in case an
          > exception happens in the servlet and wants to forward it to the jsp.
          > Putting the Exception object in the session is an alternative but I
          > wonder that is the best approach.
          > If someone knows a better way od doing it, please help.
          >
          > Pankaj

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