All about Tontang Bei

Using JSTL example in K&B Book

THANKS Michael. It works now. This is probably the last time I'm going to use notepad again.!!(and code without my glasses

)

16 years ago

Web Component Certification (OCEJWCD)

Using JSTL example in K&B Book

Yes both the jars are included as directed on page 434. but still no luck.

16 years ago

Web Component Certification (OCEJWCD)

Using JSTL example in K&B Book

NO,I called the servlet first. Not the JSP.

16 years ago

Web Component Certification (OCEJWCD)

Using JSTL example in K&B Book

The example on page 436. I have set a an array in a servlet like shown below:

Then in the result.jsp I have done below:

But the ouput I get shown is:
<@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> Movie List

Im not being shown the list of movies as shown on p 436. Why?

16 years ago

Web Component Certification (OCEJWCD)

migrating my webapp to Eclipse

Hi Jeanne,
Thanks for your reply. I warred up the app as your suggested. But Im still not sure how to get this thing up and running in eclipse. I first created a web project in eclipse, and then wen to file->import->archive file. But now I have a whole bunch of errors, and the directory structure to the left looks all screwed up. The errors are mainly due to none of packages being found. Also because I had to create a project first, the unwarred project has become a subproject or something it seems
[ May 27, 2007: Message edited by: Tontang Bei ]

16 years ago

Other IDEs, Version Control

migrating my webapp to Eclipse

I have a webapp that I run on Tomcat that I made with a simple editor. I now want to open this and work on this project inside eclipse. How can I do it?

16 years ago

Other IDEs, Version Control

Trouble integrating Tomcat with eclipse

Im reading from this book called Eclipse in Action. I have downloaded the sysdeo plugin for Tomcat placed it in the correct directory. But when I go into windows->customize perspective->java .. I don't see a 'Tomcat Project' . Or windows->preferences, still nothing no sign on Tomcat. what could be wrong? Ive tried playing around with Different JVMs as suggested by some websites but still nothing. I know I have placed the plugin at the right location because Ive see other websites in addition to the book.

16 years ago

Other IDEs, Version Control

Attributes sent from JSP wont show in Servlet

In my servlet:

I get output Null for both Attributes that I set. What am I doing wrong? Ive even tried using hidden form fields in the JSP to send. But still the result is Null in my servlet for some reason. I can see their outputted values in the JSP for sure when I use <%=%> . Any help is welcome

16 years ago

JSP

Cant run my applet

Here is the code for the applet

import java.awt.*;
import javax.swing.*;
import java.sql.*;
import java.awt.event.*;
import java.util.*;
public class Drop extends JApplet implements ActionListener{
private Connection connection;
private JList tableList;
private JButton dropButton;
public void init() {
Connection connection;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(
"jdbc:mysql://localhost/accounts?user=root&password=.");
} catch(Exception connectException) {
connectException.printStackTrace();}
Container c = getContentPane();
tableList = new JList();
loadTables();
c.add(new JScrollPane(tableList), BorderLayout.NORTH);
dropButton = new JButton("Drop Table");
dropButton.addActionListener(this);
c.add(dropButton, BorderLayout.SOUTH);
}
public void actionPerformed(ActionEvent e) {
try {
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery("DROP TABLE "
+ tableList.getSelectedValue());
} catch (SQLException actionException) {}
}

Here is the cod for the html page

on the command line I type: appletviewer Drop.html and I get a whole bunch of exceptions.

C:\Jav_Dev>appletviewer Drop.html
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:183)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:127)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at Drop.init(Drop.java:17)
at sun.applet.AppletPanel.run(AppletPanel.java:417)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.FileNotFoundException: C:\Jav_Dev\com\mysql\jdbc\Driver.class (The system cann
ot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at java.io.FileInputStream.<init>(FileInputStream.java:66)
at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:161)

at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:295)
at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:44)
at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:173)
at java.security.AccessController.doPrivileged(Native Method)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:170)
... 9 more
java.lang.NullPointerException
at Drop.loadTables(Drop.java:43)
at Drop.init(Drop.java:25)
at sun.applet.AppletPanel.run(AppletPanel.java:417)
at java.lang.Thread.run(Thread.java:619)

16 years ago

Beginning Java

Values from ListBox to be inserted

Sorry, I mean after the user hits the submit button the values are extracted in a servlet

16 years ago

JDBC and Relational Databases

Values from ListBox to be inserted

I have a web page that forwards listbox selected values to my servlet that receives it in a String Array. How would I insert this into a dbase? Is there some datatype in mysql that can help me with this? or should I format all the values into one String and then insert it normally?

16 years ago

JDBC and Relational Databases

What does this mean?

"A useful constraint is to say that any instance of the superclass must be an instance of one of the subtypes of a group.(The superclass is then abstract)."

The above is from UML distilled. Can someone explain me with example(preferably) what exactly this means??

16 years ago

OO, Patterns, UML and Refactoring

Need the JSP equivalent

Ok, but how do you send an object to a Java class from a JSP? is that not recommened?

16 years ago

JSP

Need the JSP equivalent

I have a JSp where I want to add an object to the session and then forward it to a java class. With servlets we have this kind of code

HttpSession session=request.getSession()
session.setAttribute("user",user);

RequestDispatcher dispatcher=getServletContext().getRequestDispatcher("/url");
dispatcher.forward(request,response);

How do I do this in JSP. ?

16 years ago

JSP

How are your servers keeping up?

This is not a post to request changing to Java or anything. BUt with CGI how are servers keeping with this ever growing site? don't your servers ever run out of memory with each new request? Also out of curiosity have you noticed anything that CGI offers that isn't or could be better offered withs servlets and jsp? or anything that you like about CGI?

16 years ago

Ranch Office

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