How to -only- invoke a Servlet/JSP

Hi,
I would like to invoke a Servlet or JSP inside a standalone application WITHOUT opening a stream. When I use url.openConnection() or con.connect() the servlet/JSP is not executed, I must also do "ObjectInputStream o = new ObjectInputStream(con.getInputStream());" in order to get the servlet/jsp executed.
I just want to invoke the servlet/JSP, because I use the returned data for nothing.
Thanks

If you openConnection, you might also have to get the output stream from the servlet to make it work properly. (Otherwise, the server, or proxies in-between, might consider that the client has decided it doesn't want the page after all, and may stop requesting it.)
A cheap way to request a page but get less data back would be..
conn.setRequestMethod("HEAD");HEAD is exactly like GET, except it doesn't return the body (just the headers, hence the name.) Not entirely sure if it works on Java.
Failing that, you should be able to just open the input stream, and close it again straight away.

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          Hi, all:
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          Thank you so much for your help.
          - Charles


Use exploded deployment format, touch REDPLOY file.
          Peace,
          Cameron Purdy
          Tangosol Inc.
          Tangosol Coherence: Clustered Coherent Cache for J2EE
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          "Charles Li" <[email protected]> wrote in message
          news:3c3b9161$[email protected]..
          >
          > Hi, all:
          >
          > Does anyone know how to have your servlet/JSP pick up the class changed
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          > restarting the weblogic 6.1 server?
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          > Thank you so much for your help.
          >
          > - Charles

How can I invoke a servlet without mapping it first?

Hi all!
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          "Dimitri Rakitine" <[email protected]> schrieb im Newsbeitrag
          news:[email protected]...
          > Maybe there is one, but I do not know about it - what I described is
          > the only way I know ;-(
          >
          > Paolo Vedovato <pvedovato@nospam_hotmail.com> wrote:
          > > Thank you Dimitri for your reply and help :-)
          > > I see now what I can do to achieve what I want.
          >
          > > But one questions remains: So there's no 'build-in' way to invoke a
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          > > in WLS6.1 without having to add the servlet-mapping tag in the web.xml,
          as
          > > it can be done in several servlet engines (e.g. Tomcat 4.0)?
          >
          > > -Paolo
          >
          > > "Dimitri Rakitine" <[email protected]> schrieb im Newsbeitrag
          > > news:[email protected]...
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          > >>
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          > >> <servlet>
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          > >> <servlet-class>weblogic.servlet.ServletServlet</servlet-class>
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          > >> ...
          > >> <servlet-mapping>
          > >> <servlet-name>ServletServlet</servlet-name>
          > >> <url-pattern>/servlets/*</url-pattern>
          > >> </servlet-mapping>
          > >> ...
          > >> </web-app>
          > >>
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          > >>
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          > > redeploy, and you
          > >> can run HelloWorld servlet as:
          > >>
          > >
          http://localhost:7001/examplesWebApp/servlets/examples/servlets/HelloWorldSe
          > > rvlet
          > >> )
          > >>
          > >> Paolo Vedovato <pvedovato@nospam_hotmail.com> wrote:
          > >> > Hi all!
          > >>
          > >> > I'm evaluating WLS 6.1 and in trying some examples of mine. I came
          > > across
          > >> > following problem: I have some .war in which the the servlets are
          > > invoked
          > >> > without mapping -> e.g. calling wepappname/servlet/ServletClass. I
          > > hadn't
          > >> > any success doing that on WLS 6.1.
          > >>
          > >> > If I use the servlet mapping in web.xml instead it works. but i have
          to
          > >> > rewrite all my .wars...
          > >>
          > >> > So is there a possibility to invoke a servlet in WLS6.1 without
          servlet
          > >> > mapping?
          > >>
          > >> > Thanks for your precious help!
          > >>
          > >> > -Paolo
          > >>
          > >>
          > >>
          > >> --
          > >> Dimitri
          >
          >
          >
          > --
          > Dimitri

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[email protected]

Howdy:
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<html>
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Re: How do I invoke Servlets...continued

Hi Howard,
          Could you show us web.xml?
          Regards,
          Slava Imeshev
          "Howard Hyde" <[email protected]> wrote in message
          news:3ccedf8a$[email protected]..
          > My posting appears to have been truncated, so here is the remainder:
          > (continued)
          > 'Pilot' is a servlet defined and mapped in my web.xml file. But when I
          attempt
          > to invoke the servlet in the app with any of the following:
          > http://localhost:7001/pilots/Pilot
          > http://localhost:7001/pilots/pilot
          > http://localhost:7001/pilots/servlet/Pilot
          > http://localhost:7001/pilots/servlet/pilot
          >
          > ... I get a 404 error.
          >
          > However, the following JSP, which is part of the same web application
          component
          > of the Enterprise app, works:
          > http://localhost:7001/pilots/Rating.jsp
          >
          > So the question of the day once again, is:
          >
          > How do I invoke servlets in an enterprise application?
          >
          > Best regards,
          >
          > Howard
          > 818-366-2686


and to add to matt's post:
          in the servlet init() method trace out some debug to ensure that new
          versions of your servlet are actually being deployed:
          ..init() {
          System.out.println( getServletName() + " was deployed at " + " new
          Date(System.currentTimeMillis()) );
          "Matt Krevs" <[email protected]> wrote in message
          news:[email protected]...
          > 1. What stack trace do you receive, if any, when your call to your servlet
          > doesnt work
          >
          > 2. Is your servlet in a package? If it is then you need to specify the
          > package in the servlet-class element
          >
          > 3. Is it possible that your servlet-name and/or servlet-class elements in
          > web.xml have some spaces in them? Maybe you should remove the line feeds
          > etc. and specify your servlet elements as you have your servlet-mapping
          > elements
          >
          > eg like this
          >
          > <servlet>
          > <servlet-name>Pilot</servlet-name>
          > <servlet-class>FrmPilot2</servlet-class>
          > <load-on-startup>0</load-on-startup>
          > </servlet>
          >
          > 4. Do you get any deployment errors when weblogic starts up?
          >
          > 5. Try setting the load-on-startup parameter to a positive number. You may
          > receive a helpful? stacktrace when weblogic starts up
          >
          >
          > "Howard Hyde" <[email protected]> wrote in message
          > news:[email protected]...
          > > The following are EXCERPTS from the web.xml file:
          > >
          > > <web-app>
          > > <servlet>
          > > <servlet-name>
          > > Pilot
          > > </servlet-name>
          > > <servlet-class>
          > > FrmPilot2
          > > </servlet-class>
          > > <load-on-startup>
          > > 0
          > > </load-on-startup>
          > > </servlet>
          > > <servlet-mapping>
          > > <servlet-name>Pilot</servlet-name>
          > > <url-pattern>/Pilot</url-pattern>
          > > </servlet-mapping>
          > >
          > > </web-app>
          > >
          > >
          >
          >

How do I invoke Servlets...continued

My posting appears to have been truncated, so here is the remainder:
          (continued)
          'Pilot' is a servlet defined and mapped in my web.xml file. But when I attempt
          to invoke the servlet in the app with any of the following:
          http://localhost:7001/pilots/Pilot
          http://localhost:7001/pilots/pilot
          http://localhost:7001/pilots/servlet/Pilot
          http://localhost:7001/pilots/servlet/pilot
          ... I get a 404 error.
          However, the following JSP, which is part of the same web application component
          of the Enterprise app, works:
          http://localhost:7001/pilots/Rating.jsp
          So the question of the day once again, is:
          How do I invoke servlets in an enterprise application?
          Best regards,
          Howard
          818-366-2686


My posting appears to have been truncated, so here is the remainder:
          (continued)
          'Pilot' is a servlet defined and mapped in my web.xml file. But when I attempt
          to invoke the servlet in the app with any of the following:
          http://localhost:7001/pilots/Pilot
          http://localhost:7001/pilots/pilot
          http://localhost:7001/pilots/servlet/Pilot
          http://localhost:7001/pilots/servlet/pilot
          ... I get a 404 error.
          However, the following JSP, which is part of the same web application component
          of the Enterprise app, works:
          http://localhost:7001/pilots/Rating.jsp
          So the question of the day once again, is:
          How do I invoke servlets in an enterprise application?
          Best regards,
          Howard
          818-366-2686

Urgent....How can i redirect to my jsp page from servlet in init() method..

How can i redirect to my jsp page from servlet in init() method..Becoz that servlet is calling while server startsup..so im writing some piece of code in init() method..after that i want to redirect to some jsp page ...is it possible?
using RequestDispatcher..its not possible..becoz
RequestDispatcher rd = sc.getRequestDispatcher("goto.jsp");
rd.foward(req,res);
Here the request and response are null objects..
So mi question can frame as how can i get request/response in servlet's init method()..

Hi guys
did any one get a solution for this issue. calling a jsp in the startup of the servlet, i mean in the startup servlet. I do have a same req like i need to call a JSP which does some data reterival and calculations and i am putting the results in the cache. so in the jsp there in no output of HTML. when i use the URLConnection i am getting a error as below.
java.net.SocketException: Unexpected end of file from server
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:707)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:612)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:705)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:612)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLCon
nection.java:519)
at com.toysrus.fns.alphablox.Startup.callJSP(Unknown Source)
at com.toysrus.fns.alphablox.Startup.init(Unknown Source)
at org.apache.tomcat.core.ServletWrapper.doInit(ServletWrapper.java:317)
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Thanks
Vidya

How to -only- invoke a Servlet/JSP

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