Request dispatcher between 2 servers

dear sear:
can i use request dispatcher to go from one servers to another whith the same session.
thanks,
hamdi.

Nope, Request dispatcher works with in its servlet container.
May be you can you Request.sendRedirect()..
not sure.

Similar Messages

Jndi communication between app servers?

Hi all,
I'm quite familiar with J2EE and its communication architecture. In the past, I haven't had the need to communicate from one app server to another (just all web/applet clients to the central app server). But now I need to :)
Is there a way to communicate (synchronously) between app servers on different machines that aren't clustered? Clustering is not a possibility.
I know JMS is an option, but JMS is asyncrhonous. I also know you can't create server sockets in an app server because the J2EE spec disallows this approach, so forget about client/server communication via sockets.
This would be my ideal solution:
Server A does a jndi lookup for a bean on server B. Server A gets this reference and works with it just like any other J2EE client to server B.
Does JNDI allow you to do lookups to other namespaces outside of the current namespace on server A?
Can this even be done?
Thanks,
Les Hazlewood

Yes. It's possible. For one of my applications, I have three HP-UX servers that run i2 software on them, but for different business units. I have a J2EE application that does a little bit of everything for the i2 applications. Since the business logic is the same, with only the business dept differing, I deployed 3 instances of JBoss, each running on their own server. My user's log into one of the applications, doesn't matter which, and if they request a service (EJB) that needs to run on a different server, my webapp makes a connection to that server and uses the remote EJB to do the work. It's very possible and an excellent solution.
The solution will depend on which J2EE server you're using.
Here's a class I use to retrieve the InitialContext I need for my application:
package com.cibavision;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;
import java.rmi.RemoteException;
import java.util.Properties;
public class CibaJNDI{
   public static InitialContext getInitialContext ( String server ) throws javax.naming.NamingException {
      Properties p = new Properties () ;
      p.put(Context.INITIAL_CONTEXT_FACTORY,
             "org.jnp.interfaces.NamingContextFactory");
      p.put(Context.PROVIDER_URL,
             "jnp://" + server + ":1099");
      p.put(Context.URL_PKG_PREFIXES,
             "org.jboss.naming:org.jnp.interfaces");
      return new InitialContext (p) ;
}Using this class, I have logic in my application that calls for the appropriate server, something like this:
if businessA then use server1
if businessB then use server2
if businessC then use server3
I then call for my InitialContext, request my EJB, and I'm off and running. No clustering, it matters which machine I'm on (I have to read extract files, etc.)
Works great. We are also a weblogic shop, but I haven't made any calls to weblogic from outside my J2EE app yet, but it should only differ by the hash attributes you pass to new InitialContext( props ).
Hope this helps,
Perry Tew

Cannot get Telnet to work between two servers on same subnet

I need to test if communication is open on port 8444 between two servers.
I installed telnet client on a Server 2008 R2 server and telnet server on a Server 2008 SP2 server. I also manually started the Telnet service that was set to disabled on the SP2 server. I disabled the Windows firewall on both servers. They
are both on the same subnet so they don't need to go through any routers and I can ping successfully.
When I try to telnet to the remote server by typing telnet "ip address" 8444, I get an error that says "Could not open connection to host, on port 8444: Connection failed.
I tried other ports like port 80 and got the same error.
What else is needed to get this to work?

VMs have nothing to do with it, as long as there's network communication between the servers.
As I said, there must be a service or application listening on that port for it to respond. For example, try this:
C:\> telnet
When the telnet prompt opens, type in:
open mail.messaging.microsoft.com 25
If it works, you should see this:
220 CH1EHSMHS035.bigfish.com Microsoft ESMTP MAIL Service ready at Thu, 7 Feb 2013 00:57:33 +0000
That means that Microsoft's mail servers are LISTENING on port 25 and it responded. And note, telnetting to port 25 is a non-default telnet port, because port 23 is the default telnet port. When you type in a space and then a port number, you're telling
the telnet client to use that port.
That is the SAME THING if some sort of application or service is listening on port 8444 on that other server you're trying to telnet to. If there is no app or service listening, it will just time out.
And no, installing the TELNET service on that sercver will NOT answer to any port other than 23. The telnet service by default, uses TCP 23, unless you specify otherwise.
So once again, what service or app on that server is supposed to be listening on 8444?
Ace Fekay
MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/
This post is provided AS-IS with no warranties or guarantees and confers no rights.

Port forwarding between two servers from Same subnet

Hi,
We have a Cisco ASA 5520 Version 8.4(3). There exists a site to site VPN tunnel between us and a client and the client sends us the data to our local host/server 10.x.x.20 on port 52944. So 10.x.x.20 gets data on port 52944. We want to forward this data to a test server 10.x.x.21( same subnet IP) on port 52945. so basically I want to forward traffic from 10.x.x.20:52944 to 10.x.x.21:52945.
Is this possible. I am a new bee to the networking and still learning. Excuse me if this sounds silly.
I know we can add one more ACL in the VPN tunnel and add this test server IP in the ACL. but, then I have to ask the clinet to change their ACL too. I dont want to do this. So I want to wrok around it. Any help or suggestions is much appreciated.
Thanks in advance :)
This is my first ticket in the support community.
cs

VMs have nothing to do with it, as long as there's network communication between the servers.
As I said, there must be a service or application listening on that port for it to respond. For example, try this:
C:\> telnet
When the telnet prompt opens, type in:
open mail.messaging.microsoft.com 25
If it works, you should see this:
220 CH1EHSMHS035.bigfish.com Microsoft ESMTP MAIL Service ready at Thu, 7 Feb 2013 00:57:33 +0000
That means that Microsoft's mail servers are LISTENING on port 25 and it responded. And note, telnetting to port 25 is a non-default telnet port, because port 23 is the default telnet port. When you type in a space and then a port number, you're telling
the telnet client to use that port.
That is the SAME THING if some sort of application or service is listening on port 8444 on that other server you're trying to telnet to. If there is no app or service listening, it will just time out.
And no, installing the TELNET service on that sercver will NOT answer to any port other than 23. The telnet service by default, uses TCP 23, unless you specify otherwise.
So once again, what service or app on that server is supposed to be listening on 8444?
Ace Fekay
MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/
This post is provided AS-IS with no warranties or guarantees and confers no rights.

Query Strings in Request Dispatcher Paths (PLT.16.1.1)

I'm having trouble using query strings in a request dispatcher include to a servlet.
I'm spitting debug out, and it looks like I'm calling:
PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher("/myServlet?myparam=myparamValue");
And myparam isn't being set for myServlet.
The same URL ("http://myhost:myport/myPortal/myServlet?mayparam=mayparamValue)
runs fine standalone....

I'm not sure of the exact dates (either this month or the next). But
JSR168 will be supported in the service pack.
Subbu
T-Bone said the following on 11/18/2003 09:23 AM:
Subbu Allamaraju <[email protected]> wrote:
There is a known bug in WLS's servlet container that results in this
behavior. Please contact support if you need an expedited solution.Thanks, they said to wait for SP2 sometime end of November.
Can you tell me when it will be available?
Also, when will JSR-168 v1.0 be supported?
Subbu
T-Bone said the following on 10/26/2003 03:14 PM:
I'm having trouble using query strings in a request dispatcher includeto a servlet.
I'm spitting debug out, and it looks like I'm calling:
PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher("/myServlet?myparam=myparamValue");
And myparam isn't being set for myServlet.
The same URL ("http://myhost:myport/myPortal/myServlet?mayparam=mayparamValue)
runs fine standalone....

How e-mail is routed between two servers

Hi ,
Please anybody tell me how e-mail is routed between two servers , from the software point of view as well as hardware point of view .
And how Java mail API related to that .
Thanks,
Kiz

If you're looking for a simple answer there isn't one. Here's a place to start.
http://community.roxen.com/developers/idocs/rfc/rfc974.html

Urgent, creating xml files dynamically, request dispatcher problem

hi all,
Problem 1:
There is a problem we are facing, while request dispatching.
The files CBECBC.XML & CBECBC_Envelop.XML,
both xml files. These files are created on request from the user, dynamically, and displayed on the browser,
by including them in a jsp page.
Here we face a problem when they are to be included into the jsp page.
The error is the following :
//////// Error ////////
Could not find request dispatcher for the url CBECBC.xml
Could not find request dispatcher for the url CBECBC_Envelop.xml
The created files are stored in the "d:\pstudio35\desks\bank\BankWeb\".
We are using " <jsp:include page="...."/> " (dynamic jsp include tag), to include the xml files.
Problem 2:
And could you just let me know how to include a xml file in a jsp file,
so that the xml file is displayed in the exact format of xml(with the tags).
I am using Pramati Studio 3.5
Its urgent!!!
Regards,
Deepa Datar

problem 2:
either translate all < en > into < and > or display the XML in a textarea

Nested request dispatches when using RequestDispatcher in a Button action

Hi all,
I am new to JSF so I am probably missing something very simple, please help:
The test case is simple: I created one visual web page with one button and one normal JSP file(named test.jsp) using Netbeans 5.5 with visual web pack on Sun Application Server 9 PE. The code action for the button is as follows:
public String button1_action() throws Exception
        ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();
        HttpServletRequest request = (HttpServletRequest) context.getRequest();
        HttpServletResponse response = (HttpServletResponse) context.getResponse();
        RequestDispatcher dispatcher = request.getRequestDispatcher("test.jsp");
        dispatcher.forward(request,response);
        return null;
    }Once the JSF page is loaded and the button is clicked, this exception occurs:
ApplicationDispatcher[WebApplication1] Servlet.service() for servlet Faces Servlet threw exception
javax.servlet.ServletException: WEB2651: Exceeded maximum depth for nested request dispatches: 20
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:837)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:697)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:532)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:465)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:353)
at webapplication1.Page1.button1_action(Page1.java:242)
Can anyone provide any advice on how to resolve this issue?

Hi Rachel,
As per the Servlet2.3 Javadoc:
The pathname must begin with a "/" and is interpreted as relative to the current context root.
If you make that change and include the complete path, then it would work fine.
Ex:
If your context looks like http://my.company.com/webapp1/ and if you were to have your forwardPortlet.jsp in a directory like:
webapp1
  |
  |-> htdocs
         |
         |-> forwardPortlet.jsp
then, your code would look like;
RequestDiscpatcher d = request.getRequestDispatcher("/htdocs/forwardPortlet.jsp");
HTH,
thanks,
harsha

How to create database link between 2 servers to exports schemas

Could any one please give Steps to create database link between 2 servers (linux) to exports schemas like AR, INV, GL.......etc

Hi Mouni,
As i suggest above, please use the REMAP_SCHEMA parameter, so that you can create those objects which are getting created in the Apps Schema in the XBSI schema, I have already provided the syntax above.
ORA-31684: Object type VIEW:"XBSI"."XBSI_ORDER_LINE_INFO_V" already exists
ORA-31684: Object type VIEW:"XBSI"."XBSI_SERIAL_NO_V" already exists
ORA-31684: Object type VIEW:"XBSI"."XBSI_ONHAND_BALANCES" already exists
ORA-31684: Object type VIEW:"XBSI"."XBSI_PURCHASE_ORDERS" already exists
ORA-31684: Object type VIEW:"XBSI"."XBSI_ORDER_HEADER_INFO_V" already exists
ORA-31684: Object type VIEW:"XBSI"."XBSI_ORGANIZATION_ITEMS" already exists
ORA-31684: Object type VIEW:"XBSI"."XBSI_PE_FIND_RESULT" already exists
You are facing these errors as you have already done the import, and when you try to re-import it says those objects are already available. If this fresh import, Please drop the the new user you have already created in the Datawarehouse instance, and recreate the User and start a fresh import.
Hope this help!
Thanks &
Best Regards,

Ports required for communication between Web servers and service applications (the default is HTTP)

We're using SharePoint 2010, I'm the system admin for a SharePoint farm. We enabled SharePoint Search by adding a Search Service APplication. One of the crawl report timer job is failing every 5 minte with the error "Cannot connect to remote server".
After digging around, we found that the server running the timer job tries to connect to the SearchAdmin.svc on the index server, over HTTPS / port 32844 However, communication over SSL via a non default port is blocked by our firewall.
According to this article: https://technet.microsoft.com/en-us/library/cc262849.aspx the default is HTTP for communication
between web servers. How is it possible that it's trying to connect over SSL?

Hi,
Quoted from
https://technet.microsoft.com/en-us/library/cc262849.aspx#ServiceApp :
You can change the protocol and port binding for each service application. On the Service Applications page in Central Administration, select the service application, and then click
Publish.
Here is an article for configuring Windows firewall port rules for SharePoint using PowerShell in case you need:
http://www.xylos.com/default.aspx?id=1050
Regards,
Rebecca Tu
TechNet Community Support
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

ASA single outside IP address to an inbound NAT pool that round robins request to 2 web servers

How do I create a single outside IP address 1.2.3.4 to an inbound NAT pool that round robins request to 2 web servers?
I have 2 web server 10.0.0.1 and 10.0.0.2. They have the exact same content.
I think I start with defining the pool as an object group which contains 2 server 10.0.0.1 and 10.0.0.2
object-group network appservers
network-object host 10.0.0.1
network-object host 10.0.0.2
What to do next?
object-group network appservers
nat (inside,outside) static 1.2.3.4
gives me an error.

No, unfortunately you can't configure round robin static inbound NAT for 2 internal web servers.

Transfering data between FTP Servers.

Dear Friends,
How we can transfer data between FTP servers.
Kindly provide me some step by step guide for the complete scenario,
I need to fetch the the dats from FT P server and send the data to FTP Server of MDM.
How to define Technical and Business system in SLD for above mentioned scenario.

No need of IR if you have to use XI as FTP
refer these links:
XI in the role of a FTP
Similar Threads:
Using XI as FTP without mapping
Use of SAP XI as "on demand" FTP Server
Using XI as a FTP Server ?
I dont think you would need to add servers as technical systems for this thing.
In case you want to call RFC or send or receive IDOCs from R3 servers you need to make technical systems as ABAP.

Request dispatcher null

          The forward code we have is like
          public void forward(String url, HttpServletRequest request,
          HttpServletResponse response)
          throws ServletException, IOException
          RequestDispatcher dispatcher = getServletConfig().getServletContext().getRequestDispatcher(url);
          dispatcher.forward(request, response);
          My question is:
          As per the documents
          The pathname must begin with a "/" and is interpreted as relative to the current
          context root.
          if my URL is "http://www.abcz.com/<somepage>
          request dispatcher is null? and on one server (say A) that is a problem but other
          server(say B) when given the full URL behaves ok.
          on server A I am getting a null pointer exception , which on tracing happens to
          be the request dispatcher is null.(If http://www.abcz.com/<somepage> is URL) but
          no null pointer exception if url is "/<somepage>"
          On B its behaving fine when given the "http://www.abcz.com/<somepage> " as URL
          to the method.
          Both server A and B are running wl6. Is the difference in service pack cause of
          the problem?
          Internally does wl6 parses the URL to find a relative URL?
          Any help will be greatly appreciated.
          Thanks
          Rumpa


And the reason for that is, RequestDispatcher is per application
          scope. And RequestDispatcher comes from the ServletContext which is
          the current application scope. So it has to be relative url. If you
          need to forward to an absolute url, you can use sendRedirect instead.
          Bhaskar
          "Matt Krevs" <[email protected]> wrote in message news:<[email protected]>...
          > as far as i know, you should always specify relative urls when using request
          > dispatchers
          >
          > eg
          >
          > if the entire url is
          > http://myserver/theurl
          > you would code as follows
          >
          > RequestDispatcher dispatcher =
          > getServletConfig().getServletContext().getRequestDispatcher("/theurl");
          > dispatcher.forward(request, response);
          >
          > You definitely should not use complete URLs when calling
          > getRequestDispatcher()
          >
          > what happens on the server that returns a null dispatcher if you manually
          > type the address into the browser? Does weblogic find the resource? If not
          > then you have something specified differently in your server that doesn
          > work.
          >
          >
          > "RUMPA GIRI" <[email protected]> wrote in message
          > news:[email protected]...
          > >
          > > The forward code we have is like
          > > /**********************************************/
          > >
          > > public void forward(String url, HttpServletRequest request,
          > > HttpServletResponse response)
          > > throws ServletException, IOException
          > > {
          > > RequestDispatcher dispatcher =
          > getServletConfig().getServletContext().getRequestDispatcher(url);
          > > dispatcher.forward(request, response);
          > > }
          > > /***********************************************/
          > >
          > > My question is:
          > > As per the documents
          > > The pathname must begin with a "/" and is interpreted as relative to the
          > current
          > > context root.
          > > if my URL is "http://www.abcz.com/<somepage>
          > > request dispatcher is null? and on one server (say A) that is a problem
          > but other
          > > server(say B) when given the full URL behaves ok.
          > > on server A I am getting a null pointer exception , which on tracing
          > happens to
          > > be the request dispatcher is null.(If http://www.abcz.com/<somepage> is
          > URL) but
          > > no null pointer exception if url is "/<somepage>"
          > > On B its behaving fine when given the "http://www.abcz.com/<somepage> " as
          > URL
          > > to the method.
          > > Both server A and B are running wl6. Is the difference in service pack
          > cause of
          > > the problem?
          > >
          > > Internally does wl6 parses the URL to find a relative URL?
          > >
          > > Any help will be greatly appreciated.
          > > Thanks
          > > Rumpa
          > >
          > >

Proxing request to multiple http servers

Hi,
I want to proxy request to multiple http servers.
I am able to do that for one, but now i want to configue 3 more servers.
All the servers will be giving jsp pages.
Can anybody help me in doing that.
Thanks in advance
Anshuman Nanda
[email protected]

Just for the information, I am using weblogic 5.1
and want to do the setting for that only.
Thanks
Anshuman <[email protected]> wrote in message
news:3a836910$[email protected]..
Hi,
I want to proxy request to multiple http servers.
I am able to do that for one, but now i want to configue 3 more servers.
All the servers will be giving jsp pages.
Can anybody help me in doing that.
Thanks in advance
Anshuman Nanda
[email protected]

Request dispatch problem

To all
The problem is that my request dispatching is not forwarding the request and I haven't got a clue why. I have a upload servlet which is working fine as it parses the request and the forwards you to the same jsp page or the next jsp page according to what values it extracts. However I have set up a bean to display the contentType() of each request which is sent to it from the jsp pages, however nothing is displayed when the request is forwarded from the upload servlet. this is what is happening .....
public class upload extends HttpServlet {
public void doPost( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException {
HttpServletRequest request = _req;
HttpServletResponse response = _res;
parseMultiForm pMF = new parseMultiForm( _req );
Hashtable values = new Hashtable();
String param;
while ( ( param = pMF.getNextParameter()) != null) {
String value = pMF.getParameter();
values.put(param, value);
if (values.containsKey("submit")) {
String url = (String) values.get("reload");
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/" + url);
dispatcher.forward(request, response);
if (values.containsKey("continue")) {
String url = (String) values.get("next");
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/" + url);
dispatcher.forward(request, response);
The above servlet forwards the request to a jsp which does the following....
<jsp:useBean id="info" scope="session" class="InfoBean" />
<jsp:setProperty name="info" property="request" value="<%= request %>" />
However infoBean does not receive anything when the request is forwarded from the servlet??
Can anyone see anything obviously wrong?? is it to do with the JSP asking for the <%= request> and not receiving it because the request dispatcher has altered it in some way?
Thanks in advance anyone
Andy.

I have exactly the same problem. I can�t make the servlet pass the request object to the target jsp.
Try not changing the request nor the response. Unfortunatelly due to the kind of job i do inside my servlet there's no way i can't touch the request. So if you can make it work with mi advice please let me know.

Request dispatcher between 2 servers

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