HTML and Servlets

Im currently working on a project which works on a shortest path algorithm (Dijkstras). I have completed my GUI but am relativley inexperienced at server-side technology. The problem is I am confused as to how I connect my webpage to my algorithm. Basically the system allows the user to type in a room number for a building, this number goes to the algorithm which then outputs a string which then converts it into the VRML world the user is searching in! Could you suggest the simplest way of solving my problem?

two ways to do this
1. if you're up for the challenge, this can all be done on the client side via JavaScript and VRMLScript
2. if you must/want to do the processing on the server side, then I'd create a servlet that takes the input data and processes it and then returns the VRML

Similar Messages

Regarding connection between front end HTML and back end SQL 7.0

Hi!!
I am working on the project 'ERM'. I have designed 12 forms using HTML. Can u please give me brief idea how to establish the connection between a back end and front end i.e. between HTML and SQL 7.0. If possible can u provide me the source code for the same.
I will be very thankful to you.
Thanks,
Jigar.

Read up about multi-tier applications.
You need servlet and JSPs for the server-side presentation layer, some classes for the business logic, and some mor for the persistence layer either using JDBC or some framework like Hibernate.

Deploying a WAR file containing .jsp and servlets (also uses JNI)

Deploying a WAR file containing .jsp and servlets (also uses JNI) on Windows 2000
We had problems making it initially work on Sun ONE Web Server 6.0 Service Pack 1 because of lack of good iPlanet Web
Server documentation on deploying such files.
This is how we went about it:
1) Make one of the servlet and JSP (must call another Java Class) web application (.war) examples work with iPlanet Web
Server.
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\HelloWorld\HelloWorld.war
and
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
a) Go to your Web Server Administration to deploy the application using GUI Web Application Deploy.
(We usually use command line, we experienced some issues with the GUI version, but maybe it is fixed in the new Web Server
service packs)
From browser, open http://yourserver:8888/
Click on Select a Server:Manage
Click on Virtual Server Class
Click on https-yourserver
Click on the Web Applications Tab
Then, click on Deploy Web Application
Enter the following -
WAR File On: Local
WAR File Path: C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Application URI: /jakarta
Installation Directory: c:\iPlanet\examples\jakarta-examples
By clicking on OK it deployed the application.
I can verify that it is deployed by selecting "Edit Web Applications" and I see the following entry:
Edit     /jakarta     c:/iPlanet/examples/jakarta-examples
Also, c:/iPlanet/examples/jakarta-examples should have the similar following directory structure ..
- [images]
- [jsp]
- index.html
- [servlets]
- [META-INF]
- [WEB-INF]
- [classes]
- [tlds]
- web.xml
- index.html
I restarted the server and accessed it using the following URL from my IE browser:
http://yourserver/jakarta/index.html
Then I clicked on the JSP Examples and tried some JSP examples.
b) Alternatively, you can also deploy the same example from the command-line.
Make sure C:\iPlanet\Servers\bin\https\httpadmin\bin\ is in your path
wdeploy deploy      -u /jakarta
          -i yourserver
          -v https-yourserver
          -d c:\iplanet\examples\jakarta-examples
          C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Restart the web server (I don't think you have to restart, but .. might as well).
2)Deploy your web-application
My Foo.war has the following structure.
You can use jar tf Foo.war to look at the file contents from command line (assuming you have JDK installed and the bin is
in your PATH)
Foo.war
- [META-INF]
- [WEB-INF]
- web.xml
- [classes]
- Bar.class
- MoServlet.class
- [lib]
- ThirdParty.jar
- [natlib]
- extlib.dll
- foo.jsp
Here is our application scenario:
foo.jsp uses a class call Bar (it is not in any package). The Bar java class uses classes from ThirdParty.jar. The
ThirdParty.jar in turn uses JNI to load library extlib.dll. foo.jsp also calls /servlet/Mo as well.
Now to deploy it, do the following:
(a) Make sure that within foo.jsp, you import the Bar class ( I don't know why you have to do it, but if you don't you get
JSP compile error).
<%@page language="java" import="Bar" contentType="text/html"%>
(b) Check web.xml (for Servlets)
Within web.xml, make sure you have the following mappings:
<servlet>
<servlet-name> MoLink </servlet-name>
<servlet-class> MoServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> MoLink </servlet-name>
<url-pattern> /servlet/Mo </url-pattern>
</servlet-mapping>
(c) Deploy the application
Using command line:
wdeploy deploy      -u /foo
          -i yourserver
          -v https-yourserver
          -d c:\iplanet\examples\foo-dir
          Foo.war
(d) Change web-apps.xml file (for picking up ThirdParty.jar)
It is located in
C:\iPlanet\Servers\https-yourserver\config
You should see something similar to following after successful deployment.
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true"/>
Change it to look like following to pick up the ThirdParty.jar
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true">
<class-loader reload-interval="300"
          classpath="C:/iPlanet/examples/foo-dir/WEB-INF/lib/ThirdParty.jar"
          delegate="false"/>
</web-app>
(e) Change jvm12.conf file (for JNI)
It is located in
C:\iPlanet\Servers\https-yourserver\config
Add or uncomment the following lines:
#optional - just helps with instrumenting the jsp and servlet code
jvm.include.CLASSPATH=1
jvm.enableDebug=1
nes.jsp.enabledebug=1
jvm.trace=7
jvm.verboseMode=1
#required for JNI
java.compiler=NONE
jvm.classpath=.;C:\JDK1.3.1\lib\tools.jar;C:/iPlanet/Servers/plugins/servlets/examples/legacy/beans.10/SDKBeans10.jar;
jvm.option=-Xrs
jvm.option=-Xnoagent
# not sure if this is needed for iPlanet web server
jvm.option=-Djava.library.path=C:/iPlanet/examples/foo-dir/natlib/ -Djava.compiler=NONE
(f) Change magnus.conf file (for JNI)
We HAD to change this file in order for ThirdParty.jar file to pick up the native C++ code using JNI. Apparently, the
iPlanet Web Server doesn't pick the Environment Variable Path. Because when we had the directory containing the DLL just
in Path, it didn't work.
Change Extrapath directive:
ExtraPath C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
to
ExtraPath c:/iPlanet/examples/foo-dir/natlib;C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
(g) Apply changes from the Web Server Administration Console and Restart the web server.
You should be able to see the behaviour that you want from your application.
http://yourserver/foo/foo.jsp
Hope this was helpful!!!
Sonu

Deploying a WAR file containing .jsp and servlets (also uses JNI) on Windows 2000
We had problems making it initially work on Sun ONE Web Server 6.0 Service Pack 1 because of lack of good iPlanet Web
Server documentation on deploying such files.
This is how we went about it:
1) Make one of the servlet and JSP (must call another Java Class) web application (.war) examples work with iPlanet Web
Server.
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\HelloWorld\HelloWorld.war
and
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
a) Go to your Web Server Administration to deploy the application using GUI Web Application Deploy.
(We usually use command line, we experienced some issues with the GUI version, but maybe it is fixed in the new Web Server
service packs)
From browser, open http://yourserver:8888/
Click on Select a Server:Manage
Click on Virtual Server Class
Click on https-yourserver
Click on the Web Applications Tab
Then, click on Deploy Web Application
Enter the following -
WAR File On: Local
WAR File Path: C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Application URI: /jakarta
Installation Directory: c:\iPlanet\examples\jakarta-examples
By clicking on OK it deployed the application.
I can verify that it is deployed by selecting "Edit Web Applications" and I see the following entry:
Edit     /jakarta     c:/iPlanet/examples/jakarta-examples
Also, c:/iPlanet/examples/jakarta-examples should have the similar following directory structure ..
- [images]
- [jsp]
- index.html
- [servlets]
- [META-INF]
- [WEB-INF]
- [classes]
- [tlds]
- web.xml
- index.html
I restarted the server and accessed it using the following URL from my IE browser:
http://yourserver/jakarta/index.html
Then I clicked on the JSP Examples and tried some JSP examples.
b) Alternatively, you can also deploy the same example from the command-line.
Make sure C:\iPlanet\Servers\bin\https\httpadmin\bin\ is in your path
wdeploy deploy      -u /jakarta
          -i yourserver
          -v https-yourserver
          -d c:\iplanet\examples\jakarta-examples
          C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Restart the web server (I don't think you have to restart, but .. might as well).
2)Deploy your web-application
My Foo.war has the following structure.
You can use jar tf Foo.war to look at the file contents from command line (assuming you have JDK installed and the bin is
in your PATH)
Foo.war
- [META-INF]
- [WEB-INF]
- web.xml
- [classes]
- Bar.class
- MoServlet.class
- [lib]
- ThirdParty.jar
- [natlib]
- extlib.dll
- foo.jsp
Here is our application scenario:
foo.jsp uses a class call Bar (it is not in any package). The Bar java class uses classes from ThirdParty.jar. The
ThirdParty.jar in turn uses JNI to load library extlib.dll. foo.jsp also calls /servlet/Mo as well.
Now to deploy it, do the following:
(a) Make sure that within foo.jsp, you import the Bar class ( I don't know why you have to do it, but if you don't you get
JSP compile error).
<%@page language="java" import="Bar" contentType="text/html"%>
(b) Check web.xml (for Servlets)
Within web.xml, make sure you have the following mappings:
<servlet>
<servlet-name> MoLink </servlet-name>
<servlet-class> MoServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> MoLink </servlet-name>
<url-pattern> /servlet/Mo </url-pattern>
</servlet-mapping>
(c) Deploy the application
Using command line:
wdeploy deploy      -u /foo
          -i yourserver
          -v https-yourserver
          -d c:\iplanet\examples\foo-dir
          Foo.war
(d) Change web-apps.xml file (for picking up ThirdParty.jar)
It is located in
C:\iPlanet\Servers\https-yourserver\config
You should see something similar to following after successful deployment.
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true"/>
Change it to look like following to pick up the ThirdParty.jar
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true">
<class-loader reload-interval="300"
          classpath="C:/iPlanet/examples/foo-dir/WEB-INF/lib/ThirdParty.jar"
          delegate="false"/>
</web-app>
(e) Change jvm12.conf file (for JNI)
It is located in
C:\iPlanet\Servers\https-yourserver\config
Add or uncomment the following lines:
#optional - just helps with instrumenting the jsp and servlet code
jvm.include.CLASSPATH=1
jvm.enableDebug=1
nes.jsp.enabledebug=1
jvm.trace=7
jvm.verboseMode=1
#required for JNI
java.compiler=NONE
jvm.classpath=.;C:\JDK1.3.1\lib\tools.jar;C:/iPlanet/Servers/plugins/servlets/examples/legacy/beans.10/SDKBeans10.jar;
jvm.option=-Xrs
jvm.option=-Xnoagent
# not sure if this is needed for iPlanet web server
jvm.option=-Djava.library.path=C:/iPlanet/examples/foo-dir/natlib/ -Djava.compiler=NONE
(f) Change magnus.conf file (for JNI)
We HAD to change this file in order for ThirdParty.jar file to pick up the native C++ code using JNI. Apparently, the
iPlanet Web Server doesn't pick the Environment Variable Path. Because when we had the directory containing the DLL just
in Path, it didn't work.
Change Extrapath directive:
ExtraPath C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
to
ExtraPath c:/iPlanet/examples/foo-dir/natlib;C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
(g) Apply changes from the Web Server Administration Console and Restart the web server.
You should be able to see the behaviour that you want from your application.
http://yourserver/foo/foo.jsp
Hope this was helpful!!!
Sonu

Calling EJB with HTML via SERVLET

Hi,
I used a writen example that calls EJB from HTML via SERVLET. Example name is Bonus. The problem I have is that the HTML throw error while calling SERVLET. I dont figure out what seams to be a problem. Someone know?
I wonder if the problem is in servlet? The EJB is fine!
christian
HTML CODE:(bonus.html)
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1250"/>
<TITLE>untitled1</TITLE>
</HEAD>
<BODY BGCOLOR = "WHITE">
<BLOCKQUOTE>
<H3>Bonus Calculation</H3>
<FORM METHOD="GET" ACTION="BonusAlias">
<P>Enter social security Number:<P>
<INPUT TYPE="TEXT" NAME="SOCSEC"></INPUT>
</P>
Enter Multiplier:
<P>
<INPUT TYPE="TEXT" NAME="MULTIPLIER"></INPUT>
</P>
<INPUT TYPE="SUBMIT" VALUE="Submit">
<INPUT TYPE="RESET">
</FORM>
</BLOCKQUOTE>
</BODY>
</HTML>
SERVLET CODE:(BonusServlet.java)
package mypackage5;
import mypackage5.Calc;
import mypackage5.CalcHome;
import mypackage5.impl.CalcBean;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import java.beans.*;
public class BonusServlet extends HttpServlet {
CalcHome homecalc;
public void init(ServletConfig config) throws ServletException{
//Look up home interface
try{
//InitialContext ctx = new InitialContext();
//Object objref = ctx.lookup("Calc");
//homecalc = (CalcHome)PortableRemoteObject.narrow(objref, CalcHome.class);
Context context = new InitialContext();
CalcHome calcHome = (CalcHome)PortableRemoteObject.narrow(context.lookup("Calc"), CalcHome.class);
Calc calc;
catch (Exception NamingException) {
NamingException.printStackTrace();
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String socsec = null;
int multiplier = 0;
double calc = 0.0;
PrintWriter out;
response.setContentType("text/html");
String title = "EJB Example";
out = response.getWriter();
out.println("<HTML><HEAD><TITLE>");
out.println(title);
out.println("</TITLE></HEAD><BODY>");
try{
Calc theCalculation;
//Get Multiplier and Social Security Information
String strMult = request.getParameter("MULTIPLIER");
Integer integerMult = new Integer(strMult);
multiplier = integerMult.intValue();
socsec = request.getParameter("SOCSEC");
//Calculate bonus
double bonus = 100.00;
theCalculation = homecalc.create();
calc = theCalculation.calcBonus(multiplier, bonus);
catch (Exception CreateException){
CreateException.printStackTrace();
//Display Data
out.println("<H1>Bonus Calculation</H1>");
out.println("<P>Soc Sec: " + socsec + "<P>");
out.println("<P>Multiplier: " +
multiplier + "<P>");
out.println("<P>Bonus Amount: " + calc + "<P>");
out.println("</BODY></HTML>");
out.close();
public void destroy() {
System.out.println("Destroy");

The error is that page cannot be found! When I run only the servlet it works, when I run the HTML page and enter the field throws eror that the page cannot be found!
thanks
Christian

Need help in JSP and Servlets

Hi friends,
[please forgive me if i am posting this in the wrong forum, all seems same to a fresher]
Now, to my problem..i need a suggestion, a way or a method to implement the following!
I am supposed to create a servlet that reads data from oracle database. Once i retrive the data (for example: 6 rows of a table having 4 attributes), i am supposed to pass this data to a JSP page where the data has to be formatted and displayed properly. If i call the same servlet from a different JSP, i should be able to access the data in that JSP and format it in a different way. How do i pass the data to JSP? what method i can use to achieve this task?
Note: I already know about PrintWriter pw = response.getWriter(); and then printing the formated HTML page..but i want to keep the formatting to JSP part and send only the data part that i can access in JSP
Thanks in adavance

arun_ramachandran wrote:
[please forgive me if i am posting this in the wrong forum, all seems same to a fresher]Then you should learn to be more observant - after all, we have JSP and Servlet fora, further down the list. :)
I am supposed to create a servlet that reads data from oracle database. Once i retrive the data (for example: 6 rows of a table having 4 attributes), i am supposed to pass this data to a JSP page where the data has to be formatted and displayed properly. If i call the same servlet from a different JSP, i should be able to access the data in that JSP and format it in a different way. How do i pass the data to JSP? what method i can use to achieve this task? You can store the data in your session object. You can even use JavaBeans and the jsp:usebean tag.
[http://java.sun.com/products/jsp/tags/11/syntaxref11.fm14.html]
Note: I already know about PrintWriter pw = response.getWriter(); and then printing the formated HTML page..but i want to keep the formatting to JSP part and send only the data part that i can access in JSPA wise approach - I wish more prople woiuld be as thoughtful.

JSP and Servlets - when to use which?

Greetings,
I am a software developer with a very good understanding of Java. I build web applications, console applications, server/client apps, gui apps, what have you.. Web development with Java seems so dynamic now, that I can't seem to keep up with it. I have a simple style of developing web apps with java. Basically I create Java DTO(Data Transfer Object) classes that will perform in the backend and talk to a database using JDBC, or write to file, or read from file, what have you. I develop JSP pages that produce the proper HTML based on what a user wants to see. I may create some functionality in the DTOs that will pass along certain data. Sometimes the JSP can get a little sloppy due to the nature of the app. I create forms that collect information using JSP/HTML and I create JSP pages that will extract the form data from the form page and then send that data to the DTOs for further processing. I am not creating any classes that implement or extend HttpServlet and this is starting to bother me. Is this more the accepted way of developing Java Web Apps? What could you consider these DTOs I am creating? Can these be considered servlets? I compile the classes and use them as if they were a servlet, but they really aren't right? I am not sure and I need to catch up with what's going on in the real world. This is the unfortunate part of never having anyone to mentor you. I feel like I am falling behind. What about the newer technologies emerging - Struts, Tiles, JSF, what have you.. Could these possibly be replacing the functionality of Servlets? Thanks for listening...
takizzle

There's no reason to slam anyone that's asking advice on a HELP FORUM.
anyway, that aside-
I usually use JSPs for presentation and show database views with them. take for example a shopping basket application, you would have a custom tag that would loop through the contents of the customer's shopping cart and display them.
however when the customer was filling out thier information the form would point at a servlet that would handle the logic and processing.
that's the diff- user servlets to handle logic and JSPs to handle presentation.
cheers, and good luck :)

Multiple response streams ?   HTML and binary ?

Hello,
Is it possible for a Servlet to create two responses or two output streams, with one as HTML and the other as binary?
The code below only seems to send the first (HTML) section and seems to ignore the second (binary) section ?
Thanks alot !!!
James
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class MinimalBinaryStream extends HttpServlet
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    doGet(request, response);
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    /*----------Below: Send HTML Response----------*/
    response.setContentType("text/html");
    ServletOutputStream out = response.getOutputStream();
    out.print("<h3>Text message to say binary file is on its way</h3>");
    out.flush();
    out.close();
    /*----------Below: Send Binary Response----------*/
    response.reset();
    response.setContentType("application/octet-stream");
    response.setContentLength(3);
    out = response.getOutputStream();
    out.write(0x31);
    out.write(0x32);
    out.write(0x33);
    out.flush();
    out.close();
}

The servlet validates the serial number. If the
serial number submitted is invalid, then the servlet
simply sends an HTML message to the client saying
"Invalid serial number, please try again, etc,
etc".
If the serial number is valid, then the server
encrypts it into a ZIP file and sends the ZIP file to
the client. (This part is working perfectly by the
way.)It sounds like you're not really mixing the two types of data in a single response... You're doing one or the other depending upon the value of some data the client has sent to the server
I wouldn't use the sendRedirect method off of the response. That causes a new get request to be issued from the client which is not necessary. I'd use the RequestDispatcher, preserving the initial request and forwarding both the request and response to another resource on the server. The client is unaware of any of it.
if ( serial number valid ) {
     // encrypt to ZIP
     // send zip to client on response...
} else {
     ResquestDispatcher dispatcher = request.getRequestDispatcher( "redirect.html" );
     dispatcher.forward( request, response );
}http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/RequestDispatcher.html
What would be really nice, is if the servlet could
also send an HTML message saying "Thanks for your
serial number, here is your licence.ZIP, etc,
etc".For this, maybe you could create a jsp page with a link that pointed to the ZIP file on the server. You would define the name dynamically, and attach the name to the request via setAttribute. Then use that same value in the href value on the jsp page. via request.getAttribute The jsp page would contain the message in html and the client would obtain the zip from the link. And use the RequestDispatcher to forward to the jsp page from the servlet. Place the jsp inside /WEB-INF so that by itself it is not accessble to the client. Only the server code can get to it.

JSP and Servlets? What's the difference?

I've got this book, and it's mixing servlet with jsp and then jsp with servlet. Can we just use one and still make a web application? What is the difference between the both? Can anyone give me a basic idea behind these 2 J2ee technologies.

hi,
Both use server-side Java to dynamically generate web pages. The source code to a JSP looks like HTML, with Java embedded inside
(a) normal HTML tags, (b) JSP tags like <jsp:include>, (c) custom tags, (d) scriptlets (Java code surrounded with <% and %>).
The source code to a servlet looks like Java, with HTML embedded in out.print(...) statements. Both use the Servlet API to communicate with the web server and the client. In fact, a JSP gets compiled into a servlet, so they're almost identical in terms of expressive power. The choice is, whether you're more comfortable coding your pages in Java or in JSP-style HTML; and since you can call a JSP from a Servlet and vice versa, you don't have to make an either-or decision.
Karthick PalaniChamy

Basic jsp and servlet question (JSP Model 2)

Hi
I want to make an website where i use JSP Model 2 architecture. However I got a basic question
1. I need to separate business logic from presentation with the use of jsp and servlets. Meaning I want no html code in the servlet. Can you give a simple example of how this can be done? If I map my implementation of httpServlet to a jsp page in web.xml and override doPost() and doGet(). The calls to the jsp page comes to the servlet as it should. I want to process some methods (calling sessionbeans or similar which in turn calls entitybeans) and then show the jsp page.
How do I show the jsp page without mixing html in the servlet as I've done below:
doGet(HttpServletRequest req, HttpServletResponse res)
PrintWriter p = response.getWriter();
p.print("<html><body>Hello world</body></html>"); //I dont want to do //this, I want to display the JSP site
doPost(HttpServletRequest req, HttpServletResponse res)
//doSomething
}Message was edited by:
CbbLe

You should treat your servlet class much like a controller, where you can then use JSP as the view. The way you achieve this is to use the forward() method in RequestDispatcher.
Say you've got a servlet class org.yoursite.controller.YourController:
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//Set some value for use in the JSP file associated wth me
req.setAttribute("greeting", "Hello world!");
//Done with our business logic, off we go to the JSP file
ServletContext app = getServletContext();
    RequestDispatcher disp;
    disp = app.getRequestDispatcher("/some/jsp/file.jsp);
    disp.forward(req, resp);
}Now in your JSP file:
<h1>Example</h1>
<div>
I just want to say <%= request.getAttribute("greeting") %>
</div>Going to that servlet now executes business logic and then points to the JSP file for the view. You can forward from servlet to servlet too if needs be. The string you pass to forward() is whatever would be in the URI of the request so any <servlet-mapping> configurations in web.xml are used ;)
There is some pretty in-depth documentation on the J2EE blueprints website, namely service-to-worker and front-controller patterns. I dare say if you're looking for this sort of code you'll want to look at the composite view pattern too (also on blueprints).

KM Document iView - index.html and main.css not properly displayed

Hello,
as a test we have put two files in the /documents repository in KM :
a) index.html
<head>
<link rel="stylesheet" type="text/css" href="./main.css"/>
</head>
<table width="92%" bgcolor="#FFFFFF">
<tr align="left" valign="top">
    <td> </td>
    <td colspan="5"><table width="100%" border="0" cellpadding="5" cellspacing="0">
        <tr valign="middle">
          <td width="85" bgcolor="#C7D9E9"> <p><b>Top Links</b></p></td>
          <td width="125" class="document-list"><a href="impax.html">IMPAX Client
            </a> </td>
          <td width="125" class="document-list"><a href="talkstation.html">TalkStation</a></td>
          <td width="125" class="document-list"><a href="ris.html">RIS</a></td>
          <td width="125" class="document-list"><a href="connectivity.html">Connectivity
            Manager</a></td>
          <td width="125" class="document-list"><a href="impax.html">IMPAX Server</a></td>
        </tr>
      </table></td>
</tr>
</table>
b) main.css
A:visited
    color: #264560
A:active
    color: #12212E
A:hover
    color: #14623D
A
    color: #336699
table
    margin-top: 0px;
    margin-bottom: 0px;
p
    color:#000000;
     font-family: Arial, Helvetica, sans-serif;
     margin-bottom: 0px;
    margin-top: 5px;
     font-size: 12px;
.document-list
    background-color:#C7D9E9;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12px;
    font-color: #000000
    margin-bottom:3px;
When going to Content Administration -> KM Content -> Documents and clicking the index.html file, the css file is taken into account, when i.e hovering over the IMPAX hyperlink, the path is http://<host>:<port>/irj/go/km/docs/documents/impax.html and the impax.html page is displayed when clicked.
However, when creating a KM Document iView (with or without content filter) pointing to /documents/index.html and displaying the iView, the style sheet is ignored, and the same hyperlink as above now refers to http://<host>:<port>/irj/servlet/prt/portal/prtroot/impax.html, which is incorrect.
-> How can this behaviour be explained?
-> When creating an URL iView pointing to /irj/go/km/docs/Agfa_Knowledgebase/index.html , everything works as expected.
Thanks for the help -

Hi,
You should correct the path to your css file in your index.html:
href="/irj/go/km/docs/documents/main.css"
Regards,
Praveen Gudapati

Third-party jars not visible to EJB's and servlets.

Hi, This is an unanswered post in an newsgroup which exactly displays our
current problem,
Extract Begins -->
"I've got a WebApp with classloading issues while running WebLogic 5.1.
According to the JSDK 2.2 API, if I include third-party classes in
WEB-INF/lib, my EJBs and servlets should be able to load any jar'ed classes
inside. In practice, however, it seems to make no difference. My EJB always
comes back with a NoClassDefFound error for xerces.jar that's in WEB-INF/lib
(and I've even tried adding it to the EJB JAR itself with no change).Of
course, if I put Xerces in the server's classpath, there are no problems but
that's a road I don't want to go down.How can I tell my EJB's to load
third-party classes from the WEB-INF/lib directory of the WAR file? I'd
appreciate your insight. <-- End
We are busy migrating one of our apps from 5.1 to 6.1, What we have done
thus far and fairly successfully is the following,
We packaged all the jsps, WEB-INF, html, images into a WAR file and then
packed all EJB's, META-INF and classes to which the ejbs refer, into an EAR
file.
EMARKET_APPS/
+myjsp.jsp
+myhtml.html
+images
+WEB-INF/+
|
+classes/+
|
+myclass1.class
+myclass2.class
|
+lib/+
|
+OReily.jar
+jts.jar
+xerces-1_4_1.jar
+junit.jar
+jcschart110Kwl.jar
|
+web.xml
+weblogic.xml
+META-INF/+
|
+applications.xml
+ejbs/+
|
+myejb1.jar
+myejb2.jar
+lib/+
|
+classes.jar
Please advise.
Rgs Roly

Have you tried to include the jars in the Class path entry in the manifest file.
That should work eventhough I haven't tried it yet (fighting with ear deployement
and I must say WLS seems to be winning). I'll get back to when I've tried it.
There is a VERY good article on theserverside.com regarding class loaders and
EAR/WAR/EJBs at http://www.theserverside.com/resources/articles/J2EE-Deployment/chapter.html
Good luck
/erik

JSP and servlets

Am I correct in assuming that JSP is an extention of servlets and that to learn JSP in effect means learning about servlets? My point is, is JSP the superior technology a bit like learning JDK1.4 is now a pointless excercise as it has been superceded by 1.5 ?
thanks

Am I correct in assuming that JSP is an extention of
servletsYes.
and that to learn JSP in effect means
learning about servlets? No. This isn't necessary, as a matter of fact, it is one of the reasons why JSP exists - so people with little or no Java knowledge can build dynamic web sites using Servlet containers, assuming they have Java programmers behind them to build the tags / glue to the web app.
Still, I say having basic understanding of Servlets (at least) will help you out.
My point is, is JSP the
superior technology No. JSP has a different role. It makes display easier to code for non-Java programmers (looks more like HTML/XML), and easier to support and understand later on.
JSP does horribly bad at complex application control, data selection and manipulation, or as an interface to external resources. Java and Servlets are better at these tasks (but conversly, are horrible to work with for display purposes).
They are different, JSPs and Servlets, in what task they do. J2EE is far superior when you use them both appropriately.
a bit like learning JDK1.4 is now
a pointless excercise as it has been superceded by
1.5 ?No.
JSP is a newer technology, but should not be used to replace Servlets, but used along side Servlets to provide a better designed and manageable application.
Let the servlets control what pages the user sees when, to gather data, to talk with external resources. Then forward to a JSP which simply displays what the Servlet did all the work in getting.
>
thanks

Usage difference in JSP and Servlets

Can someone explain when a servlet is used against JSP and vice versa?

I think Servlet is more convience to communicate with javabean, when handling a large number of variables.
For example, a html form post a 2D array of variable.
Then you may find diffcult to past these variable into a bean using JSP.
Also when you diffcult to separate the html and java code in some JSP page, then it is better to use servlet.
On the other hand, the advantage of JSP is that it doesn't require user to complie the source code by hand, more suitable for some page that is always changing.

SQLJ JSP and SERVLETS which Environment?

Hello,
I am attempting to run the samples on Chapter 5 of the
following documents with partial success.
http://technet.oracle.com/docs/products/oracle8i/doc_library/817_
doc/java.817/a83726/oraext2.htm
http://download-west.oracle.com/otndoc/oracle9i/901_doc/java.901/
a90208/oraext.htm#1015820
1. Do I need the Apache+Jserv environment to run SQLJ and JSP?
2. What do I need to do run SQLJ on oc4j if possible?
3. I dont know how to load(?) and/or run this .sqljsp file.
<%@ page language="sqlj"
import="sqlj.runtime.ref.DefaultContext,oracle.sqlj.runtime.Oracl
e" %>
<HTML>
<HEAD> <TITLE> The SQLJQuery JSP </TITLE> </HEAD>
<BODY BGCOLOR="white">
<% String empno = request.getParameter("empno");
if (empno != null) { %>
<H3> Employee # <%=empno %> Details: </H3>
<%= runQuery(empno) %>
<HR><BR>
<% } %>
<B>Enter an employee number:</B>
<FORM METHOD="get">
<INPUT TYPE="text" NAME="empno" SIZE=10>
<INPUT TYPE="submit" VALUE="Ask Oracle");
</FORM>
</BODY>
</HTML>
<%!
private String runQuery(String empno) throws
java.sql.SQLException {
DefaultContext dctx = null;
String ename = null; double sal = 0.0; String hireDate = null;
StringBuffer sb = new StringBuffer();
try {
dctx = Oracle.getConnection("jdbc:oracle:oci8:@", "scott",
"tiger");
#sql [dctx] {
select ename, sal, TO_CHAR(hiredate,'DD-MON-YYYY')
INTO :ename, :sal, :hireDate
FROM scott.emp WHERE UPPER(empno) = UPPER(:empno)
sb.append("<BLOCKQUOTE><BIG><B><PRE>\n");
sb.append("Name : " + ename + "\n");
sb.append("Salary : " + sal + "\n");
sb.append("Date hired : " + hireDate);
sb.append("</PRE></B></BIG></BLOCKQUOTE>");
} catch (java.sql.SQLException e) {
sb.append("<P> SQL error: <PRE> " + e + " </PRE> </P>\n");
} finally {
if (dctx!= null) dctx.close();
return sb.toString();
%>
I named above file as test2.sqljsp then I tried these procedures:
a) $ ojspc test2.sqljsp --these created all the files
b) $ loadjava -u -v scott/tiger _test2.class -resolve
this generated:
initialization complete
loading : _test2
creating : _test2
resolver :
resolving: _test2
errors : _test2
ORA-29521: referenced name test2$_jsp_StaticText could not
be found
ORA-29521: referenced name test2SJProfileKeys could not be
found loadjava: 2 errors
c) listed the directory and both these files are there but it
cannot resolve or find it?
d) I recall reading something about publishjsp command but I have
to establish a session shell with OSE? this part is very
confusing and am not sure what to do here.
e) not sure if i need to publish the loaded class (create a
procedure? so it can be known to the rest of plsql?)
A step by step procedure is very much appreciated. fyi.. I
have Oracle 8.1.7, + oc4j, I can run sqlj from command line
and class files generated I can run. I can also run JSP and
servlets on the oc4j accessing the database. It is this SQLJ
that throws me off balance. If you include Jdeveloper steps
ro run SQLJ thats also welcome.
Thanks in advance for kind responses posted.

In many Model-View-Controller web applications implemented using J2EE, servlets are as controllers to direct the flow between the model and view. While servlets can output HTML code directly, it is much better to use JSPs for the most part. JSPs contain HTML and possibly Java scriptlets. The J2EE container will typically compile JSPs into servlets. While you could use a JSP as a controller, there are drawbacks to that approach. To minimize the amount of Java code in your JSPs, you can either use the tags provided by the JSP spec or use tag libraries written by someone else or yourself. See the JSTL for one such example.
Also see:
http://wiki.java.net/bin/preview/Javapedia/MVC
http://wiki.java.net/bin/view/Javapedia/JavaServerPages

Sequence of deployment for EJBs and Servlets....

Is there any way to control the order in which weblogic 6.0 deploys EJBs
          and servlets?
          We have a few startup servlets which use EJBs, however, weblogic 6.0
          seems to start the Servlets before it deploys the EJBs and thus our
          servlets fail.
          Haider Abbas Kazmi - Java Mobile App. Developer
          [haider.kazmi.vcf]


6.1 solves this problem:
          http://e-docs.bea.com/wls/docs61/adminguide/appman.html#1030797
          Haider Abbas Kazmi <[email protected]> wrote:
          > This is a multi-part message in MIME format.
          > --------------9AC9295410C7463D3A71C1A6
          > Content-Type: text/plain; charset=us-ascii
          > Content-Transfer-Encoding: 7bit
          > Is there any way to control the order in which weblogic 6.0 deploys EJBs
          > and servlets?
          > We have a few startup servlets which use EJBs, however, weblogic 6.0
          > seems to start the Servlets before it deploys the EJBs and thus our
          > servlets fail.
          > --
          > Haider Abbas Kazmi - Java Mobile App. Developer
          > --------------9AC9295410C7463D3A71C1A6
          > Content-Type: text/x-vcard; charset=us-ascii;
          > name="haider.kazmi.vcf"
          > Content-Transfer-Encoding: 7bit
          > Content-Description: Card for Haider Abbas Kazmi
          > Content-Disposition: attachment;
          > filename="haider.kazmi.vcf"
          > begin:vcard
          > n:Kazmi;Haider
          > tel;cell:(416)9864702
          > tel;fax:(416) 6434832
          > tel;work:(416) 3666425 x315
          > x-mozilla-html:FALSE
          > url:http://www.everypath.com/
          > org:Everypath Canada;Research & Development
          > adr:;;260 King St;Toronto;Ontario;M5A 4L5;Canada
          > version:2.1
          > email;internet:[email protected]
          > title:Java Mobile App. Developer
          > fn:Haider Kazmi
          > end:vcard
          > --------------9AC9295410C7463D3A71C1A6--
          Dimitri

HTML and Servlets

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