Ordinary java class and jsp page

hi i want to use some java class(not javabean ) in my jsp . how do i import them and use them?

You can just import the package into your JSP, and access it like any other class of the Standard Java API that you access.
fun_one

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Passing vector between java class and jsp page

Hi,
I think this is similar to the last post but anyways maybe somebody can help us both out bontyh.....I am getting an error saying undefined variable or class when i try to access a Vector which was returned in a class.
Anyways anyone got any ideas?

Maybe if you give some more information...

Java Classes and JSP`s (urgent)

hi, my question is:
How can i invoke normal java classes` methods using Jsp`s for this??, is it possible??, if it is, then how do you do this, and where do you have to put the java classes in order to find them from a jsp.
thanks

Hi,
You can access normal java classes in JSP pages. You have to import them in the header like this:
<%@ page language="java" import="//your java class file with package"%>
or if u r using java beans, then use the <usebean> tag. Put the java classes in the classes directory. Which server u r using? If it is JWS, then u have a specified classes directory, where u have to put all the class files along with their packages. Hope this will help.
atanu.

How to load java class from jsp page?

hi all!
Does anyone know how to load java class from jsp page?
I try to load java class from jsp page.
Is it possible to load java class fom jsp page?
thanks and have a good day!

What I mean is How to load/open java class file from jsp page?
I think we can open Applet from jsp page by using
<applet code=helloApplet.class width=100 height=100>
</applet>
but, how to open java class which is an application made by Frame?
thanks and have a good day

Calling java class from jsp page

Dear Friends.
I wrote jsp page and java class.
Am calling java class from jsp page. after processing result,
I have to refresh jsp page from java class.
processing time may take 5 minutes or 1 minute etc. that depends on user.
Can It be possible ? if possible , How ?

Ok, I get a very strange error now:
org.apache.jasper.JasperException: Unable to compile class for JSPerror: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
What is this??? Anyone?

Tag to take a java class in JSP page

Hi,
� need to get a tag to get a java class for example Test.java into a JSP page like MyJSP.jsp so that � can ,after doing this, call its methods, variables etc.
Thank you !

� know a way to do th�s us�ng JRun but the programme � have (NETBEANS IDE 3) does not accept �t.

Java File and JSP Page

I am to create a link verification program -- a simple java file with the database connection & some business logic and a JSP page that instantiates the my java file. It won't work. Everytime I run the jsp page, it gives me java.lang.NullPointerException. Can anyone give me some directions? The web server I am using is JRun.
Thank you
Below are my code:
JSP Page:
<%--      Verify Links
--%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<%@ page import="java.sql.*" %>
<%@ page import="java.net.*" %>
<%@ page import="pro.*" %>
<html>
<head>
<title>Results</title>
</head>
<body>
<%
try{
LinkConnection newconn = new LinkConnection();
newconn.initialize();
newconn.query();
newconn.close();
}catch (ClassNotFoundException cnfe)
out.println(cnfe);
catch (SQLException sqle)
out.println(sqle);
catch (NullPointerException npe)
out.println(npe);
%>
</body>
</html>
Java Code:
package pro;
import java.io.*;
import java.sql.*;
import java.net.*;
public class LinkConnection {
Connection con;
ResultSet RS;
Statement Stmt;
public void initialize() throws SQLException, ClassNotFoundException
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection("XXXX", "XXXX", "XXXX");
public void query() throws SQLException
Statement Stmt=con.createStatement();
String strSQL="Select guideline_name, guideline_url from pgt_guidelines";
ResultSet RS=Stmt.executeQuery(strSQL);
while (RS.next())
String guidelinename = RS.getString("guideline_name");
String guidelineurl = ("http://" + RS.getString("guideline_url"));
try {
URL url = new URL(guidelineurl);
HttpURLConnection link=(HttpURLConnection)url.openConnection();
System.out.println("<font color='blue'>");
System.out.println(guidelinename);
System.out.println("<br>");
System.out.println(guidelineurl);
System.out.println("</font>");
System.out.println("<font color='red'>");
System.out.println(link.getResponseCode());
System.out.println("</font>");
System.out.println("<br />");
          }catch (Exception e)
          {System.out.println("<font color='yellow'>Error Link </font>")
public void close() throws SQLException {
RS.close();
Stmt.close();
con.close();

i'm having the same problem, what is the solution to this
A Servlet Exception Has Occurred
java.lang.NullPointerException
     at test.Lesson.runSql(Lesson.java:80)
===== Lesson.java file =====
package test;
import java.sql.* ;
import java.io.Serializable;
public class Lesson {
     public Lesson( ) { }
//Line 9
     public String runSql ( ) {
          String browserOutput = "";
          Connection sqlca = null;
          Statement sqlStatement = null;
          ResultSet myResultSet = null;
//Line 16
          /* Connect to database, run SQL and produce output */
          try {
               /* Connection to the database */
               Class.forName("org.gjt.mm.mysql.Driver").newInstance();
               String theDatabase ="jdbc:mysql://localhost/employee";
               sqlca = DriverManager.getConnection(theDatabase,"usr","pwd");
//Line 24
               /* Construct and execute the sql, positioning before the
               first row in the result set */
               sqlStatement = sqlca.createStatement();
               myResultSet = sqlStatement.executeQuery
//Line 29
               ("select emp_id, " +
                    "emp_lname, " +
                    "city, " +
                    "state," +
                    "zip_code, " +
                    "emp_fname " +
                    "from employee " +
                    "where emp_id < 250 " +
                    "order by emp_lname, emp_fname");
//Line 39
               /* Construct the heading for the table */
               browserOutput =
                    "<div align=left>"+
                    "<table border=0 align=left width=520>" +
                    "<caption><i><b>" +
                    "Employee Listing</b></i></caption>" ;
//Line 46
               /* Construct the column headings for the table */
               browserOutput +=
                    "<th align=left>Emp_id</th>" +
                    "<th>First Name</th>" +
                    "<th>Last Name</th>" +
                    "<th>City</th>" +
                    "<th>State</th>" +
                    "<th>Zip</th>" ;
//Line 55
               /* Move to next row and & its contents to the html output */
               while(myResultSet.next()) {
                    browserOutput += "<TR><TD>" +
               myResultSet.getObject("emp_id").toString() + "</TD><TD>" +
               myResultSet.getObject("emp_fname").toString()+"</TD><TD>" +
               myResultSet.getObject("emp_lname").toString() + "</TD><TD>" +
               myResultSet.getObject("city").toString() + "</TD><TD>" +
               myResultSet.getObject("state").toString() + "</TD><TD>" +
               myResultSet.getObject("zip_code").toString() + "</TD></TR>" ;
//Line 66
               }//end of while
               sqlStatement.close();
               sqlca.close();
          }//end of try
          catch (SQLException e) {
//Line 72
               browserOutput = " Error: SQLException: " + e.getMessage();
               browserOutput= " Error: SQLState: " + e.getSQLState();
               browserOutput= " VendorError: " + e.getErrorCode();
          }//end of SQLException
          catch (Exception e) {
               browserOutput = " Error: JDBC Class creation: " + e.getMessage();
          }//end of Exception
/**Line 80**/     finally {
               try { sqlca.close(); }
               catch(SQLException e) {
               browserOutput = " Error: Closing connection: " + e.getMessage();
          }//end of finally
     /* Complete the html and return it to the Java Server Page */
     browserOutput += "</table>" + "</div>" ;
     return browserOutput;
     } //end of runSql
}//end of Lesson

Passing parameters from a Java class to Jsp page

Hi everybody. I'm newbie in using Java class in conjunction with JSP pages. Infact I have a problem. How can I pass the parameters used in a Java class (as UserName, Password, and so on..) to a JSP page? What methods (and classes) I have to use?
Thank you in advance
Have a nice day

It still doesn't work. I write the code
//my java class
package channel_service;
import java.util.Vector;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2002</p>
* <p>Company: </p>
* @author unascribed
* @version 1.0
public class CallMenu {
private Vector parameters = new Vector();
public void setParameters( String UserId ) {
parameters.add(0, UserId);
//parameters.add(2, Pin);
//parameters.add(3, UserName);
//parameters.add(4, Greeting);
public Vector getParameters() {
return parameters;
//my jsp page
<%@ page import="Channel_Service.src.channel_service.CallMenu" %>
<%@ page import="java.util.Vector" %>
<html>
<head><title>User Menu Page</title></head>
<body>
<center><h1><i><b>This is your personal User Menu page</b></i></h1></center>
<br>
<br>
<center><h2><i>In the list below you'll find all your personal information (as UserID, Password and so on...)
and all the function you have the rights to use</i></h2></center>
<br>
<br>
<table align=center>
<tr>
<%
CallMenu cl = new CallMenu();
cl.setParameters();
Vector params = cl.getParameters();
String UserId = (String)params.elementAt(0);
String Pin = (String)params.elementAt(1);
String UserName = (String)params.elementAt(2);
String Greeting = (String)params.elementAt(3);
%>
<td><h2><b><i>User ID = <%= UserId %></td></tr>
<tr><td><h2><b><i>PIN = <%= Pin %></td></tr>
<tr><td><h2><b><i>User Name = <%= UserName %></td></tr>
<tr><td><h2><b><i>The system says <%= Greeting %></td></tr>
</table>
</body>

Import java-classes in JSP-page

Hi,
I'm starting with JSP and with trying one of the first examples in the book "beginning J2EE 1.4" from wrox, i got following problem.
i'm trying to import a java-class in the package CH03 with
<%@ page import="Ch03.FaqCategories" %>but he didn't find the package Ch03.
I try already many things and i have no idea of the cause of the problem. So it's difficult to give information that leads to the solution.
Maybe helpfull is the direcory-structure:
jsp-page: /Ch03/welcome.jsp
java-classe: /Ch03/WEB-INF/classes/Ch03/FaqCategories.class
If you need source-codes or other information, just ask.
Thanks,
Dennis

Thank you,
Your help was one step into the good direction and that problem is solved.
The application work now with studio one, but if i try it to work it with a stand-alone tomcat server it doesn't work anymore. I go first try to solve this problem by my self or at least try to describe the problem more exactly, before i ask for new help.
but if you have any idea, that's always welcome...
with regards,
Dennis

How to use java class in jsp page of JSPProvider?

Hello everybody.
I created simple JSPProvider channel with portal amconsole and named it "jspprov1". Then I created "jspprov"1 directory under "/ets/opt/SUNWps/desktop/sampleportal". I put "index.jsp" in it. And it worked until I add this line into "index.jsp": <% @page import="jspprov1package.aclass1" %>. Then I created directory "jspprov1package" under "/ets/opt/SUNWps/desktop/classes" and put "aclass1.class" into it and into "/ets/opt/SUNWps/desktop/classes" itself. I created "aclass1.class" on the other machine (with no installed portal) in j2sdk1.4.1_02: "javac aclass1.java". The text of this class is simple:
"package jspprov1package;
public class aclass1{
public int int_field = 10;
But the page still don't work. It writes on the portal desktop "ERROR: Content is not available".
Does anybody know why this happened?

Sorry, there were mistakes in jsp page and java files.
I maked the channel "show exceptions" and found them out.

Scope of a java class in JSP page

Hi
If I use a java bean using the
<jsp:useBean
id="beanSomeName"
scope="page|request|session|applicaton
I can specify the scope of of the bean after which I can assume it is Garbage Collected.
However if I just create a new Java Class in a jsp bean ( I inherited this code ) what will be scope of this java class. When will it be Garbage collected.
Is it Page scope?
Thanks
bib/-

If you do
<% MyClass c = new MyClass(); %>
and don't do anything else to store it in the request or session than it is like page scope.
if you do
<%! MyClass c = new MyClass(); %>
it is more like application scope.

Calling my Java class from JSP page

Hello, I am trying to call my Java class from my JSP page passing parameters to it and getting back a collection of result sets. Can someone tell me what I might be doing wrong:
JSP code to call Java class:
<%
String strEssUser = "test";
String strProcessingMonth = "JUL";
String strProcessingYear = "2002";
strQueryList=new ListReturn(strEssUser.toString(), strProcessingMonth.toString(), strProcessingYear.toString());
%>
I get this error when I try to run this JSP page using tomcat:
C:\Program Files\Apache Tomcat 4.0\work\Standalone\localhost\em\jsp\Test_0005fSummarySBU_0005fscreen$jsp.java:77: Class org.apache.jsp.ListReturn not found.
strQueryList=new ListReturn(strEssUser.toString(), strProcessingMonth.toString(), strProcessingYear.toString());
I'm not sure if this problem is the way I am calling the Java class, or if I have a problem in the Java code itself. Can anyone help?

Ok, I get a very strange error now:
org.apache.jasper.JasperException: Unable to compile class for JSPerror: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
What is this??? Anyone?

Importing java classes into jsp page

I'm trying to import java classes inside my jsp page, while doing that i am getting compilation error "package uma.natarajan.javaclasses" not found. I don't know where to copy the java files. i'm keeping my jsp files under public_html folder


Hi uma,
          create uma\natarajan\javaclasses under weblogic_home\myserver and copy java
          classes(u want to import) to uma\natarajan\javaclasses and then u try.
          Concept is the java classes u import should be present in a classpath. Hope
          this may help u,
          Arun,
          [email protected]
          "uma natarajan" <[email protected]> wrote in message
          news:3a490bcb$[email protected]..
          > I'm trying to import java classes inside my jsp page, while doing that i
          am getting compilation error "package uma.natarajan.javaclasses" not found.
          I don't know where to copy the java files. i'm keeping my jsp files under
          public_html folder

Java class into jsp page

hi i,m a beginnner
how can i run my own java class into a JSP file?
please help me!
thanks

If you understand the OO concepts and wrote the Java class right, then all you need to do is something like:YourJavaClass yourJavaClass = new YourJavaClass();
yourJavaClass.doSomething();After all I rather recommend to use servlets for business logic instead of JSP (read: scriptlets).

Sharing java class among JSP pages. Urgent!

Hi,
I have a class A and two JSP pages P1 and P2 page.
i need to share the class values in both the pages.
that is, whatever am doing in class A through P1 should be impacted on P2.
Please tell me how to do this.
Thaks,
Raja.

Well then you might try
session.setAttribute("myBean", myBean);and
MyBean myBean = (MyBean) session.getAttribute("myBean");The session is common space for storing the user's objects if you want to keep them over multiple requests.
The session is implicitly available to all JSPs and via the Request object in a servlet.
If the information is common to all users, another alternative may be to implement it as a Singleton bean - or have a static instance of it. But that may not be what you actually want.

Ordinary java class and jsp page

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