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
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import java.awt.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.protocol.*;
import java.awt.image.*;
import javax.imageio.*;
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boolean stateOK = true;
DataSourceHandler handler;
int imgWidth;int imgHeight;
Image outputImage;
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int[] outvid;
int startFr = 1;int endFr = 1000;int countFr = 0;
boolean sunjava=true;
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// setLayout(new FlowLayout(FlowLayout.LEFT));
// currPanel = new imgPanel(new Dimension(imgWidth,imgHeight));
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// pack();
//setLocation(100,100);
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nextframetime+=10;
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synchronized(waitObj)
try
while(p.getState() < state && stateOK)
waitObj.wait();
catch (Exception e)
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* Controller Listener.
public void controllerUpdate(ControllerEvent evt)
if(evt instanceof ConfigureCompleteEvent || evt instanceof RealizeCompleteEvent || evt instanceof PrefetchCompleteEvent)
synchronized(waitObj)
stateOK = true;
waitObj.notifyAll();
else
if(evt instanceof ResourceUnavailableEvent)
synchronized(waitObj)
stateOK = false;
waitObj.notifyAll();
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tidyClose();
* Inner classes
* A DataSourceHandler class to read from a DataSource and displays
* information of each frame of data received.
class DataSourceHandler implements BufferTransferHandler
DataSource source;
PullBufferStream pullStrms[] = null;
PushBufferStream pushStrms[] = null;
Buffer readBuffer;
* Sets the media source this MediaHandler should use to obtain content.
private void setSource(DataSource source) throws IncompatibleSourceException
// Different types of DataSources need to handled differently.
if(source instanceof PushBufferDataSource)
pushStrms = ((PushBufferDataSource) source).getStreams();
// Set the transfer handler to receive pushed data from the push DataSource.
pushStrms[0].setTransferHandler(this);
// Set image size
imageProfile((VideoFormat)pushStrms[0].getFormat());
else
if(source instanceof PullBufferDataSource)
System.out.println("PullBufferDataSource!");
// This handler only handles push buffer datasource.
throw new IncompatibleSourceException();
this.source = source;
readBuffer = new Buffer();
* This will get called when there's data pushed from the PushBufferDataSource.
public void transferData(PushBufferStream stream)
try
stream.read(readBuffer);
catch(Exception e)
System.out.println(e);
return;
// Just in case contents of data object changed by some other thread
Buffer inBuffer = (Buffer)(readBuffer.clone());
// Check for end of stream
if(readBuffer.isEOM())
System.out.println("End of stream");
return;
// Do useful stuff or wait
useFrameData(inBuffer);
public void start()
try{source.start();}catch(Exception e){System.out.println(e);}
public void stop()
try{source.stop();}catch(Exception e){System.out.println(e);}
public void close(){stop();}
public Object[] getControls()
return new Object[0];
public Object getControl(String name)
return null;
below is the servlet code.
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ShowMovie extends HttpServlet {
String rootURL="http://127.0.0.1:8080/Video/";
public void processRequest(HttpServletRequest request, HttpServletResponse response)
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//String movie=request.getParameter("movie");
String movie ="son";
getStart(movie);
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throws ServletException, IOException {
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
public void getStart(String url){
new vid2jpg(url);
this is the error from the server. Im using tomkat 5
exception
javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.NoClassDefFoundError: javax/media/ControllerListener
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1812)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
ShowMovie.getStart(ShowMovie.java:31)
ShowMovie.processRequest(ShowMovie.java:14)
ShowMovie.doGet(ShowMovie.java:22)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs. -
How do I Display a string from a servlet into a JSP Page???? NEED HELP!!!!
Hi guys,
How do I Display a string from a servlet into a JSP Page...
Ive tried so many bloody things!.....
Simply.
I get text from JSP. The servlet does what ever it does to the string.
Now. Ive create sessions and bean things,.... how the hell do I display it in a text box... I can display on the screen.. but not in the text box.!!!
please help!!!hmmm, I dont really like using JSP programming, u should be using JAVA..
the way to do it is:
Call and cast to the bean like this:
<%@ page import="beans.*" %>
<% //cast to bean get request create object
userNameBean u= (userNameBean) request.getSession().getAttribute("userNameBean");
then... all you do is call it like this:
<input type="text" name="firstName" value="<%= u != null? u.getFirstName(): "" %>">
this is the real programmers way,,,
chet.~ -
Calling 3 different servlets from a single servlet
hi all,
i am in lot of soup...i am new to servlets,etc....so help me pls.
i need to call 3 different servlets from one servlet. all 3 servlets that i want to call perform different functions and execute queries on the database.
what i am trying to do is:
there is an html page that call a servlet called authenticate.java.(whose code is at the bottom of this page).
the servlet authenticate.java should authenticate a user according to the password and username supplied in the html page.
MAINLY:-
i need to display 3 buttons to the authenticted user. those 3 buttons each should call 3 different servlets, which do different things.
now in authenticte.java i set certain information in the session using session.putValue();
further, whatever servlet is called, i need to use that information i set into the session...using session.getValue().
PLS TELL ME HOW TO DO THAT...ALSO C IF THE BELOW CODE IS OK.
ALSO TELL ME HOW TO END A SESSION. ALSO DO SERVLETS SUPPORT SESSIONS?
I AM USING jdk1.3 and jsdk2.0.
* Authenticate.java
// this places all user variables in session
//to access use session.getAttribute
//dispatcher stuff
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import java.sql.*;
import java.io.*;
import java.util.*;
* @author Gudiya
* @version
public class Authenticate extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
HttpSession session = request.getSession(true);
Connection con=null;
String sessionid;
String deptcode;
String desig;
String add1;
String add2;
String contname;
PrintWriter out = response.getWriter();
try
{System.out.println(1);
response.setContentType("text/html");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:SACFA","","");
System.out.println("connection established");
catch(ClassNotFoundException e){
System.out.println("database driver not found");
System.out.println(e.toString());
catch(Exception e){System.out.println(e.toString());
String username=request.getParameter("username");
String password=request.getParameter("password");
try{
System.out.println(2);
PreparedStatement stmt=con.prepareStatement("SELECT * FROM AUTHENTICATION,mb_add where AUTHENTICATION.NAME=? AND AUTHENTICATION.PASSWORD=? AND mb_add.DEPT_NAME=?");
stmt.setString(1,username);
stmt.setString(2,password);
stmt.setString(3,username);
ResultSet rs=stmt.executeQuery();
System.out.println(3);
boolean rowfound=false;
rowfound=rs.next();
if (rowfound==true)
sessionid=session.getId();
System.out.println(sessionid);
System.out.println(4);
session.putValue("user",username);
rs.beforeFirst();
while (rs.next())
System.out.println(5);
deptcode=rs.getString("DEPT_CODE");
desig=rs.getString("DESIGNATION");
add1=rs.getString("ADDRESS1");
add2=rs.getString("ADDRESS2");
contname=rs.getString("NAME");
session.putValue("dept_code",deptcode);
session.putValue("designation",desig);
session.putValue("address1",add1);
session.putValue("address2",add2);
session.putValue("cont_name",contname);
System.out.println(6);
} out.println("<html>");
out.println("<head>");
out.println("<title>Successful Login Screen</title>");
out.println("</head>");
out.println("<body bgcolor='ORANGE'>");
out.println("WELCOME SACFA MEMBERS FROM "+ username);
//print decorative html statements here
out.println(" SELECT ANY ONE ACTION:-");
//out.println("<form Action="+"\"servlet/noc\""+" method =post>");//call for your noc servlet
//print decorative html statements here
out.println("<INPUT TYPE=submit VALUE='GENERATE NOC' NAME='NOC'>");
out.println("</form>");
//print decorative html statements here
//out.println("<form Action="+"\"servlet/comments\""+" method =post>");//call for your comment servlet
out.println("<INPUT TYPE=submit VALUE='ENTER/ MODIFY COMMENTS' NAME='COMMENTS' >");
out.println("</form>");
//print decorative html statements here
// out.println("<form Action="+"\"servlet/bye\""+" method = post>");
out.println("<INPUT TYPE=submit VALUE=EXIT NAME=EXIT >"); //place javascript fucction for exiting window
out.println("</form>");
out.println("</body>");
out.println("</html>");
con.close();
} catch( SQLException e){ }
out.close();}
THANK YOU,
REGARDS,
ASHNAHi Ashna,
You have use three different forms for three buttons. But I think all are commented one.It will also work if you uncomment it.
Else you can use only one Form without giving action in form tag. Use normal buttons instead of submit type buttons & call different JavaScript functions on onClick event for each button.
Try this out.
Ajay -
Pass the data back from the jsp page to the java code
Hi,
I have written an iView that receives an event using EPCF and extracts data from the client data bag.
I need this iView to pass the data back from the jsp page to the java code.
I am trying to do this using a hidden input field, but I cannot get the code to work.
Here is the code on the jsp page.
<%@ taglib uri="tagLib" prefix="hbj" %>
<hbj:content id="myContext" >
<hbj:page title="PageTitle">
<hbj:form id="myFormId">
<hbj:inputField id="myInputField" type="string" maxlength="100" value="" jsObjectNeeded="true">
<% myInputField.setVisible(false);%>
</hbj:inputField>
</hbj:form>
</hbj:page>
</hbj:content>
<script language=JavaScript>
EPCM.subscribeEvent("urn:com.peter", "namedata", window, "eventReceiver");
function eventReceiver(eventObj) {
var url = eventObj.dataObject;
var funcName = htmlb_formid+"_getHtmlbElementId";
func = window[funcName];
var ipField = eval(func("myInputField"));
ipField.setValue(url);
var form = document.all(htmlb_formid);
form.submit();
</script>
Here is my java code
package com.sap.training.portal;
import com.sapportals.htmlb.InputField;
import com.sapportals.htmlb.page.DynPage;
import com.sapportals.htmlb.page.PageException;
import com.sapportals.portal.htmlb.page.JSPDynPage;
import com.sapportals.portal.htmlb.page.PageProcessorComponent;
public class ListSalesOrder extends PageProcessorComponent {
public DynPage getPage(){
return new ListSalesOrderDynPage();
public static class ListSalesOrderDynPage extends JSPDynPage{
private String merong;
public void doInitialization(){
public void doProcessAfterInput() throws PageException {
InputField reportfld = (InputField) getComponentByName("myInputField");
if (reportfld != null) merong = reportfld.getValueAsDataType().toString();
public void doProcessBeforeOutput() throws PageException {
if ( merong != null ) setJspName("merong.jsp");
else setJspName("ListSalesOrder.jsp");
Here is DD
<?xml version="1.0" encoding="utf-8"?>
<application>
<application-config>
<property name="SharingReference" value="com.sap.portal.htmlb"/>
<property name="PrivateSharingReference" value="com.sap.portal.htmlb"/>
</application-config>
<components>
<component name="SearchSalesOrder">
<component-config>
<property name="ComponentType" value="jspnative"/>
<property name="JSP" value="/pagelet/SearchSalesOrder.jsp"/>
</component-config>
<component-profile>
<property name="tagLib" value="/SERVICE/htmlb/taglib/htmlb.tld"/>
</component-profile>
</component>
<component name="ListSalesOrder">
<component-config>
<property name="ClassName" value="com.sap.training.portal.ListSalesOrder"/>
</component-config>
<component-profile>
<property name="tagLib" value="/SERVICE/htmlb/taglib/htmlb.tld"/>
</component-profile>
</component>
</components>
<services/>
</application>
After receive event, then call java script function "eventReceiver" and call "form.submit()".
But .. PAI Logic in Java code doesn't called ...
Where is my problme ?
Help me ...
Regards, Arnold.Hi Arnold,
you should not do a form.submit yourself. Instead you can put a component called ExternalSubmit to your page:
ExternalSubmit exSubmit = new ExternalSubmit("EX_SUBMIT"));
exSubmit.setServerEventName("MyEvent");
This results in a java script funtion on the page which is called "_htmlb_external_submit_". If you call this function the the form gets submitted and your event handler is called.
regards,
Martin
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