Calling servlets from a jsp in a directory

Hello,
I use JBuilder 9 to develop a web application, and I organize all jsp files in directories inside root directory. The problem is that when I try to use any servlet in the project, I have to use the following address "http://localhost8080/servletName" and it worked fine, but when I run the application on another machine that has port 8083 for JBuilder it didn't work of course. So is there a generic address that I can use that can work with any port?
Sorry for the long message,
Thanks,

yes, but when I use the relative name of the servlet, I get an error saying that the servlet is not found inside the directory in which the jsp(the one from which I call the servlet) exists. For some reason the program searches for the servlet in the same directory and of course doesn't find it. What do you think I can do about this?
Thanks,

Similar Messages

Do not know how to call Servlet from a JSP???

How do I call a Servlet from a JSP page?
I have an JSP page that does a few things but when there is an error I need the JSP page to call a Servlet but do not know how to do it.
I want to call a ServletFaillogin from a JSP page how can I do it?
<html><head>
<title> Login Page </title>
</head>
<body>
<%@ page import= "portal.* " %>
<jsp:useBean class="portal.PortalSystem" id="bean" scope="session" />
<% try
String servername = request.getParameter("servername");
String username = request.getParameter("username");
String password = request.getParameter("password");
bean.Connect(servername, username, password);
catch(Exception e)
   //******Here I need help *********
   action="http://localhost:8080/test/servlet/ServletFaillogin";
%>
<h1> You have successfully logged in. </h1>
</body></html>

I have changed the code but get error, why??
I think it could be due to the way classes are located,
All my HTML and JSP pages are at:
C:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\jsp\portal-project
The class ServletFaillogin is located here:
C:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\WEB-INF\classes\portal
What am I doing wrong, please help???
<html><head> <title> FTP Login </title> </head>
<body>
<%@ page import= "portal.* " %>
<jsp:useBean class="portal.PortalSystem" id="bean" scope="session" />
<%      try
           String servername = request.getParameter("servername");
           String username   = request.getParameter("username");
           String password   = request.getParameter("password");
           bean.Connect(servername, username, password);
        catch(Exception e)
           response.sendRedirect("http://localhost:8080/myJSPs/servlet/ServletFaillogin");
%>
<h1> You have successfully logged in. </h1>
</body></html>

Tomcat 6 Calling a Java Servlet from a JSP Page

Below is a very simple JSP Page that calls a Java Servlet. The question is given Tomcat security constraints, is it possible to call a servlet from a JSP and get the correct output without getting an error message? If so, how would you code the web.xml file?
c:\apache-tomcat-6.0.18
Under conf
catalina
localhost
HelloWorldExample.xml is directly under localhost
The application would have this directory structure:
webapps
HelloWorldExample
hello.jsp is directly under HelloWorldExample
Under HelloWorldExample
src
WEB-INF
classes
Under classes
jservlets
HelloWorld.java is in src folder
HelloWorld.class is in jservlets folder
HelloWorldExample.xml
<Context path="/HelloWorldExample" docBase="HelloWorldExample" debug="0"
      reloadable="true" crossContext="true">
</Context>**************************
hello.jsp
<HTML>
<HEAD>
<TITLE>Hello</TITLE>
</HEAD>
<BODY>
<FONT SIZE="4">
<P>
Please enter your name:
<FORM
   METHOD="Post"
   ACTION="servlet/jservlets.HelloWorld">
<TABLE BORDER="3" CELLPADDING="1" WIDTH="100%" ALIGN="CENTER">
<TR>
    <TD><B>Name:</B></TD>
    <TD><INPUT TYPE="text" NAME="Name" VALUE="" SIZE="65"> </TD>
</TR>
</TABLE>
<P>
<INPUT TYPE="SUBMIT" VALUE="Submit">
</FORM>
</FONT>
</BODY>
</HTML>******************
HelloWorld.java
package jservlets;
import java.io.*;
import java.util.Date;
import java.util.*;
import java.text.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet
   PrintWriter out;
   PrintWriter err;
   String strName;
public void displayMessage(HttpServletRequest request, HttpServletResponse response)
      throws Exception
         try
            if (!strName.equals("") && strName != null)
               out.println("Hello " + strName + "" + "<P>");
                out.println("Hello World" + "<P>");
            else
                out.println("Hello World" + "<P>");
        catch (Exception e)
            out.println("Exception: Could not display message." + "<P>");
            err.println (e.getMessage () ) ;
            out.println("<P>");
public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException
      try
           response.setContentType("text/html");
           out = response.getWriter();
           err = response.getWriter();
           strName = request.getParameter("Name").trim();
           out.println("<html><head><title>");
          out.println("</title></head><body>");
           out.println("<FORM");
           out.println("METHOD=POST");
           out.println("ACTION=http://localhost:8080/HelloWorldExample/hello.jsp>");
         out.println("<TABLE ALIGN='RIGHT'>");
         out.println("<TR>");
         out.println("<TD>");
           out.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"Hello World Page\";>");
           out.println("</INPUT>");
          out.println("</TD>");
         out.println("</TR>");
         out.println("</TABLE>");
         out.println("</FORM>");
         out.println("<BR CLEAR='all'>");
           out.println("<P>");
           displayMessage(request, response);
           out.close();
         out.println("</body></html>");
       catch(Throwable e)
          e.printStackTrace();
      public void doGet(HttpServletRequest request, HttpServletResponse response)
         throws ServletException, IOException
         doPost(request, response);
web.xml
<servlet>
      <servlet-name>HelloWorld</servlet-name>
      <servlet-class>jservlets.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/servlet/HelloWorld</url-pattern>
</servlet-mapping>      ******************************
HelloWorld.java can be compiled by using javac.
Once compiled, HelloWorld.class would be moved to the jservlets folder.
FYI, coding the above url-pattern results in:
HTTP Status 404
The requested resource (/HelloWorldExample/servlet/jservlets.HelloWorld) is not available
The following url-pattern in the web.xml file permits the servlet to be executed but results in a null pointer exception:
<servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/ </url-pattern>
</servlet-mapping>      **************************************************
Robin

This problem was resolved.
In hello.jsp
ACTION="servlet/jservlets.HelloWorld">
was replaced with
ACTION="servlet/HelloWorld">
Robin

Very urgent: call servlet from JSP

Hello,
I'm facing a problem in invoking a servlet from a JSP having the JSF components.
The application has a text field to implement ajax for search functionality in the database .I have written a servlet to make the database connection and fire the querry.
Ajax implementation in a js file is called on every keyup event in the jsp file,and
a call is given to the servlet from the ajax methode.
The function in the js file is as follows:-
function getPersonByFirstNameXML( firstName ) {
    if (!firstName) {
        clearPersonByFirstNameXML();
    } else {
        var url = BASE_URL + "/servlet/get_PersonsXML";
        alert(url);
        return new AJAXRequest("post", url, "firstName=" + encode(firstName), processGetPersonByFirstNameXML);
}Im getting the myAJAX.status value as 500.
I think I'm not able to access the servlet properly.
what changes do i need to make in the we.xml file ?
and what should be the url to be passed.
Please provide me a sloution to the above problem as it is very urgent else if anybody is aware of a readymade JSF componet with search functionality freely available please let me know.
PS:
The sample application named RedirectionExample which makes use of a servlet and would be of help to you. You can find the tutorial on the following page:
http://developers.sun.com/prodtech/javatools/jscreator/reference/codesamples/sampleapps.html
is not available as stated in some of the suggestions by Author: mayagiri
Thanks for any help.
Abhi

the status 500 generally means either HTTP server internal error or that execution of CGI script or servlet aborted with error.
It can be reasonably supposed that the request reaches the servlet, ie. that "url" value points to some existing servlet, otherwise most probably the status value would be 404.
To test that the servlet is working i'd try to access it using some simple html page with form like this (with {BASE_URL} replaced by real value):
<form method=post action={BASE_URL}/servlet/get_PersonsXML>
<input type=text name=firstName>
<input type=Submit>
</form>

Wot all ways are there to call servlet from jsp

hi all
i want to know wot all methods are available
so that i can call servlet from jsp
the one which i know is using RequestDispatcher
wot are others ?
thanx

hi all
i want to know wot all methods are available
so that i can call servlet from jsp
the one which i know is using RequestDispatcher
wot are others ?
thanxhi here are few ways... to call servlet from jsp...
these are just generic syntax.
Form:
<form action="ServletPath">
Link:
Directives & Action tags :
<%@ page import="ServletPath" %>
     <%@ taglib uri="ServletPth" %>
     <jsp:include page="ServletPath">
     <jsp:forward page="ServletPath">
     <jsp:useBean class="ServletPath"> (Not sure about this useBean)
hope you got your answer.
regards,
immu

Maintain session when calling servlet from form in a JSP

I have the following set up:
index.jsp calls login servlet from the action tag in a form.
Login servlet handles the login, stores the user info and db connection in the session and uses forward(req,res) to call another jsp.
That jsp has a form where user enters search info and in that form's action tag there is a search servlet. In the search servlet I am unable to access the session.
Is there any way to pass the session to the servlet from that jsp using a form/action?

I've read elsewhere that if you go from a jsp to a servlet that the >request object is cleared of any attributes from the previous request.which is correct. But arent we speaking about session object here? A request object is valid for a request - ie the phase from where the server receieves a hit for a resource upto the point it sends the output for that request.
A session spans multiple requests.
it doesn't retrieve the session info and gives me a null pointer >exception when I try to use the connection object stored in the session.Bad bad bad . Why do you store Connection objects in session? Create them when necessary or use a connection pool. Do you for example clean up the connections when the session expires. What if its a 30 minute session and the user hits every say 15 minutes with a request. Why do you need to hold on to the Connection in the intervening interval when the user's session is inactive?
gives me a null pointer exception when I try to use the connection object stored in the session.which means that the Connection object is null - not the session object.
That last line is where I get the null pointer exception. And that is
Statement stmt = con.createStatement();?
Same answer as above.
If the session object was null,
userSession.getAttribute("connection");would have thrown a NPE.
ram.

How to call Servlet from jsp page and how to run this app using tomcat..?

Hi ,
I wanted to call servlet from jsp action i.e. on submit button of JSP call LoginServlet.Java file.
Please tell me how to do this into jsp page..?
Also i wanted to execute this application using tomcat.
Please tell me how to do this...? what setting are required for this...? what will be url ..??
Thanks.

well....my problem is as follows:
whenever i type...... http://localhost:8080/appName/
i am getting 404 error.....it is not calling to login.jsp (default jsp)
but when i type......http://localhost:8080/appName/login.do........it executes servlet properly.
Basically this 'login.do' is form action (form action='/login.do').....and i wanted to execute this from login jsp only.(from submit button)
In short can anyone please tell me how to diaplay jsp page using tomcat 5.5
plz help me.

Calling servlet from a java program

Hi
I need to call a servlet's doPost() method from a java program. I have a specific situation, where I need to call servlet from a java program. DUring this call I need to pass a file and two string to the servlet. Servelt after receiving the file and string uploads the file to the server at a specified location. I am stuck up as how to call servlet from a java program instead of a HTML or JSP.
Can anyone help me to start with this.
any suggestion is welcome.

You have to establish a URLConnection with servlet from your java program.
URL servletURL = new URL("http://localhost:8080/Myservlet?str1=abc&str2=def");
URLConnection servletConnection = servletURL.openConnection();you can get the objectOutputStream
ObjectOutputStream oos = new ObjectOutputStream (servletConnection.getOutputStream());
oos.writeObject(your file object);-------------------------------------------------
In the servlet u can get the strings using request.getParameter("str1");
In the servlet u can get the strings using request.getParameter("str2");
file = new ObjectInputStream (request.getInputStream()).readObject()a lot of resources are available on this ...
hope this helps :)

Calling Servlet from a java prog?

Hi all,
I am calling servlet from a java prog (Java Agent in Lotus Notes) by using URL and URLConnection object. how can i trigger the Servlet By using doPost method .I have to send some parameter also.
Thanx
Muthu

you need to open a connection to the servlet. Then you must call getInputStream() and getOutputStream() and use them in any way you see fit. I was trying this before and could not get POST to work unless I openned the input stream from the servlet. Strange... but doGet worked without openning the input stream???
// open a connection....
// write to the servlet
servletConnection.getOutputStream().write("whatever");
servletConnection.getOutputStream().flush();
servletConnection.getOutputStream().close();
// grab what the servlet sends back, required to do a post.
byte [] in = new byte[100];
servletConnection.getInputStream().read(in);
servletConnection.getInputStream().close();

Calling servlets from main()?

Hi
I would like to know that while calling servlets from another class having main(), how can we set the type of request i.e. put, post or get?
Thanks

use the method - setRequestMethod( "POST") of HttpURLConnection for setting the method to POST.Similarly for other methods..
You could find [url http://java.sun.com/developer/JDCTechTips/2004/tt0210.html#2]this useful

Calling a servlet from a JSP page using the J2EE reference implementation

I have a JSP with an include tag as follows: <jsp:include page="servlet/ConnectionServlet" flush="true" />
When I use JRUN it works fine. I created an ear file and ported
the application to the J2EE reference implementation. When running the app under the J2EE reference implementation the ConnectionServlet is never called. I figured it must a deployment issue. I tried adding the ConnectionServlet.class file to the WEB-INF\classes file as servlet\ConnectionServlet.class but the JSP still can't find the servlet. Any ideas where I've gone wrong? TIA, Joe

I have a JSP with an include tag as follows:
<jsp:include page="servlet/ConnectionServlet"
flush="true" />Basically, WEB-INF/classes gets added to the classpath, so the directory structure under this folder should be identical to your package structure. If the ConnectionServlet.class is not actually in a package, then it should be directly in WEB-INF/classes (ie if "servlet" isn't actually the name of your package, don't use a WEB-INF/classes/servlet/" directory).
Then try taking out the "servlet" from your include tag, so you just have page="/ConnectionServlet" (not sure about the leading slash - try experimenting!)
if this doesn't work, try adding this to your WEB-INF/web.xml file:
<web-app>
<servlet>
<servlet-name>ConnectionServlet</servlet-name>
<servlet-class>your.full.package.here.ConnectionServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ConnectionServlet</servlet-name>
<url-pattern>/ConnectionServlet</url-pattern>
</servlet-mapping>
</web-app>
Good Luck!

Urgent: how to call servlet from JSP

I have a working servlet which returns a table in html format. I also updated the web.xml file according to the information I got from the previous message. My problem is how to correctly invoke the servlet in the JSF. I tried the following ways:
<jsp:include page="/report">
<jsparams>
<jsparam name="srcDev" value="#{Page1.srcDevice}"/>
<jsparam name="tgtDev" value="#{Page1.tarDevice}"/>
<jsparam name="format" value="complete"/>
</jsparams>
</jsp:include>
and
<frame src="/report?param1=val1&param2=val2" name="body" frameborder="YES" scrolling="YES" bordercolor="#999999" noresize>
both doesn't work.I am able to run the servlet within a html form. I just don't know what's the right syntax for calling the servlet inside a JSP page in JSF.
Can anybody help me?
Thanks,
Christine

Hi Christine,
This forum is exclusively for Sun Java Studio Creator related issues.
In case you are using Creator then you can find a sample application named RedirectionExample which makes use of a servlet and would be of help to you. You can find the tutorial on the following page:
http://developers.sun.com/prodtech/javatools/jscreator/reference/codesamples/sampleapps.html
Cheers
Giri :-)

How to call servlet from jsp

i m trying to call it from jsp using
<a href="../purchaseP?orderno=<%=pno%>"><%=pno%></a>
but its giving error..
type Status report
message HTTP method GET is not supported by this URL
description The specified HTTP method is not allowed for the requested resource (HTTP method GET is not supported by this URL).

i m trying to call it from jsp using
<a href="../purchaseP?orderno=<%=pno%>"><%=pno%></a>
but its giving error..
type Status report
message HTTP method GET is not supported by this URL
description The specified HTTP method is not allowed
for the requested resource (HTTP method GET is not
supported by this URL).Are you implementing the doGet or doPost method in your servlet? If you are calling from a hyperlink then it needs to be implementing the GET method. To access the POST method use a html form.

Problem calling servlet from within a jsp

I have a servlet which obtains images for a page
http://bychance.ca/servlet/ImageServlet?PhotoId=AJ-LA-4008
I use the servlet from within a jsp
<img src="servlet/ImageServlet?PhotoId=<%=rs.getObject("ID")%>" border="0">
for some reason it does not work, the images are never called. I have another servlet which is called the same way and it works fine
<img src="servlet/ImageServletLarge?PhotoId=<%=strPhotoId%>" border="0">
Thank you all for your time

this is my servlet code. Like I said it works fine in another servlet
rs.next();
byte[] bytearray = new byte[rs.getInt(1)];
int size=0;
InputStream sImage;
sImage = rs.getBinaryStream(2);
response.reset();
response.setContentType("image/jpeg");
while((size=sImage.read(bytearray))!= -1 )
response.getOutputStream().write(bytearray,0,size);
response.flushBuffer();
sImage.close();

C:import tag - Query string while calling servlet from JSP

Hi,
From my JSP I am calling a servlet to write back to the response stream of the JSP. From the JSP i am trying to pass some values into the query string as follows
     <%
     String strGetParameters = "/servlet/MyServlet?path=" + strPath;
      %>
     <pre><c:import url="<%=strGetParameters%>" /></pre>In the servlet I try to get the path from the query string by using
request.getParameter("path")But in the servlet the query string doesnt have the "path" parameter that I added in the strGetParameters string (in the JSP).
Am i missing something? Do i have to use something else or do something else?
Any help is appreciated.

I've taken some time to do a simple test and it just works.
Here is the test code, it was tested in Java EE 5 + JSTL 1.2 + Tomcat 6.
JSP<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%>
<html>
    <head>
        <title>Test</title>
    </head>
    <body>
        <pre>
            <c:import url="myServlet?param1=foo&param2=bar">
                <c:param name="param3" value="meep" />
                <c:param name="param4" value="waah" />
            </c:import>
        </pre>
    </body>
</html>MyServlet (mapped on "/myServlet")package mypackage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
        String param1 = request.getParameter("param1");
        String param2 = request.getParameter("param2");
        String param3 = request.getParameter("param3");
        String param4 = request.getParameter("param4");
        String output = param1 + ", " + param2 + ", " + param3 + ", " + param4;
        response.getOutputStream().write(output.getBytes());
}All parameters gets printed.

Calling servlets from a jsp in a directory

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