Question

Can not load applet class into browser

Asked by: akah123

HI there,

I am tring to create a web browser that run's as an applet. I am using tomcat 6 and have placed my html file and my jar file in the relevant root directory (C://Program files/Apache Software foundation/Tomcat 6.0/webapps/ROOT). I have signed my jar file as I will need to gain access to the clients hardrive. This went through successfully. My jar file is called Mini_Browser_app.jar and the html is called Mini_Browser_app.html. The applet works fine when it is run via the appletviewer. I have tried to load the jar file by the relevant html. However I keep on getting this error message:

load: class Mini_Browser_app.class not found.
java.lang.ClassNotFoundException: Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app/class.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app.class
load: class Mini_Browser_app.class not found.
java.lang.ClassNotFoundException: Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app/class.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app.class
load: class Mini_Browser_app not found.
java.lang.ClassNotFoundException: Mini_Browser_app
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app

//html code
 
<HTML>
<Head>
<Title> A Simple Program </Title>
<Body>
 
<Applet codebase = "Mini_Browser_app.jar"
Code="Mini_Browser_app" 
ARCHIVE = "Mini_Browser_app.jar"
width="150" height="50">
</Applet>
 
</Body>
</HTML> 
 
//applet code
 
import java.applet.*;
import java.net.*;
 
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.html.*;
 
public class Mini_Applet_Browser extends Applet implements HyperlinkListener {
	    // These are the buttons for iterating through the page list.
	    private JButton backButton, forwardButton;
	    
	    // Page location text field.
	    private JTextField locationTextField;
	    
	    // Editor pane for displaying pages.
	    private JEditorPane displayEditorPane;
	    
	    // Browser's list of pages that have been visited.
	    private ArrayList pageList = new ArrayList();
	    
	    // Constructor for Mini Web Browser.
	    public void init() {
	        // Set application title.
	        //super("Mini Browser");
	        
	        // Set window size.
	        setSize(640, 480);
	        
	        /** Handle closing events.
	        addWindowListener(new WindowAdapter() {
	            public void windowClosing(WindowEvent e) {
	                actionExit();
	            }
	        }  };
	        **/
	  
	        
	        
	        // Set up file menu.
	        JMenuBar menuBar = new JMenuBar();
	        JMenu fileMenu = new JMenu("File");
	        fileMenu.setMnemonic(KeyEvent.VK_F);
	        JMenuItem fileExitMenuItem = new JMenuItem("Exit",
	                KeyEvent.VK_X);
	        fileExitMenuItem.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionExit();
	            }
	        });
	        fileMenu.add(fileExitMenuItem);
	        menuBar.add(fileMenu);
	        //setJMenuBar(menuBar);
	        this.add(menuBar);
	        
	        // Set up button panel.
	        JPanel buttonPanel = new JPanel();
	        backButton = new JButton("< Back");
	        backButton.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionBack();
	            }
	        });
	        backButton.setEnabled(false);
	        buttonPanel.add(backButton);
	        forwardButton = new JButton("Forward >");
	        forwardButton.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionForward();
	            }
	        });
	        forwardButton.setEnabled(false);
	        buttonPanel.add(forwardButton);
	        locationTextField = new JTextField(35);
	        locationTextField.addKeyListener(new KeyAdapter() {
	            public void keyReleased(KeyEvent e) {
	                if (e.getKeyCode() == KeyEvent.VK_ENTER) {
	                    actionGo();
	                }
	            }
	        });
	        buttonPanel.add(locationTextField);
	        JButton goButton = new JButton("GO");
	        goButton.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionGo();
	            }
	        });
	        buttonPanel.add(goButton);
	        
	        // Set up page display.
	        displayEditorPane = new JEditorPane();
	        displayEditorPane.setContentType("text/html");
	        displayEditorPane.setEditable(false);
	        displayEditorPane.addHyperlinkListener(this);
	        /**
	        getContentPane().setLayout(new BorderLayout());
	        getContentPane().add(buttonPanel, BorderLayout.NORTH);
	        getContentPane().add(new JScrollPane(displayEditorPane),
	                BorderLayout.CENTER);
	    }
	    **/
	        this.setLayout(new BorderLayout());
	        this.add(buttonPanel, BorderLayout.NORTH);
	        this.add(new JScrollPane(displayEditorPane),
	                BorderLayout.CENTER);
	    }
	        
	    // Exit this program.
	    private void actionExit() {
	        System.exit(0);
	    }
	    
	    // Go back to the page viewed before the current page.
	    private void actionBack() {
	        URL currentUrl = displayEditorPane.getPage();
	        int pageIndex = pageList.indexOf(currentUrl.toString());
	        try {
	            showPage(
	                    new URL((String) pageList.get(pageIndex - 1)), false);
	        } catch (Exception e) {}
	    }
	    
	    // Go forward to the page viewed after the current page.
	    private void actionForward() {
	        URL currentUrl = displayEditorPane.getPage();
	        int pageIndex = pageList.indexOf(currentUrl.toString());
	        try {
	            showPage(
	                    new URL((String) pageList.get(pageIndex + 1)), false);
	        } catch (Exception e) {}
	    }
	    
	    // Load and show the page specified in the location text field.
	    private void actionGo() {
	        URL verifiedUrl = verifyUrl(locationTextField.getText());
	        if (verifiedUrl != null) {
	            showPage(verifiedUrl, true);
	        } else {
	            showError("Invalid URL");
	        }
	    }
	    
	    // Show dialog box with error message.
	    private void showError(String errorMessage) {
	        JOptionPane.showMessageDialog(this, errorMessage,
	                "Error", JOptionPane.ERROR_MESSAGE);
	    }
	    
	    // Verify URL format.
	    private URL verifyUrl(String url) {
	        // Only allow HTTP URLs.
	        if (!url.toLowerCase().startsWith("http://"))
	            return null;
	        
	        // Verify format of URL.
	        URL verifiedUrl = null;
	        try {
	            verifiedUrl = new URL(url);
	        } catch (Exception e) {
	            return null;
	        }
	        
	        return verifiedUrl;
	    }
	    
	  /* Show the specified page and add it to
	     the page list if specified. */
	    private void showPage(URL pageUrl, boolean addToList) {
	        // Show hour glass cursor while crawling is under way.
	        setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
	        
	        try {
	            // Get URL of page currently being displayed.
	            URL currentUrl = displayEditorPane.getPage();
	            
	            // Load and display specified page.
	            displayEditorPane.setPage(pageUrl);
	            
	            // Get URL of new page being displayed.
	            URL newUrl = displayEditorPane.getPage();
	            
	            // Add page to list if specified.
	            if (addToList) {
	                int listSize = pageList.size();
	                if (listSize > 0) {
	                    int pageIndex =
	                            pageList.indexOf(currentUrl.toString());
	                    if (pageIndex < listSize - 1) {
	                        for (int i = listSize - 1; i > pageIndex; i--) {
	                            pageList.remove(i);
	                        }
	                    }
	                }
	                pageList.add(newUrl.toString());
	            }
	            
	            // Update location text field with URL of current page.
	            locationTextField.setText(newUrl.toString());
	            
	            // Update buttons based on the page being displayed.
	            updateButtons();
	        } catch (Exception e) {
	            // Show error messsage.
	            showError("Unable to load page");
	        } finally {
	            // Return to default cursor.
	            setCursor(Cursor.getDefaultCursor());
	        }
	    }
	    
	  /* Update back and forward buttons based on
	     the page being displayed. */
	    private void updateButtons() {
	        if (pageList.size() < 2) {
	            backButton.setEnabled(false);
	            forwardButton.setEnabled(false);
	        } else {
	            URL currentUrl = displayEditorPane.getPage();
	            int pageIndex = pageList.indexOf(currentUrl.toString());
	            backButton.setEnabled(pageIndex > 0);
	            forwardButton.setEnabled(
	                    pageIndex < (pageList.size() - 1));
	        }
	    }
	    
	    // Handle hyperlink's being clicked.
	    public void hyperlinkUpdate(HyperlinkEvent event) {
	        HyperlinkEvent.EventType eventType = event.getEventType();
	        if (eventType == HyperlinkEvent.EventType.ACTIVATED) {
	            if (event instanceof HTMLFrameHyperlinkEvent) {
	                HTMLFrameHyperlinkEvent linkEvent =
	                        (HTMLFrameHyperlinkEvent) event;
	                HTMLDocument document =
	                        (HTMLDocument) displayEditorPane.getDocument();
	                document.processHTMLFrameHyperlinkEvent(linkEvent);
	            } else {
	                showPage(event.getURL(), true);
	            }
	        }
	    }
	    
	   
 
}

                                  
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Asked On
2009-02-24 at 14:59:35ID24174139
Tags

apache tomcat applet jar signed web browser

Topics

Java Editors & IDEs

,

Web Servers

,

Computer Servers

Participating Experts
1
Points
500
Comments
16

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Answers

 

by: objectsPosted on 2009-02-24 at 15:02:42ID: 23727850

>Code="Mini_Browser_app"

should be:

Code="Mini_Applet_Browser"

 

by: akah123Posted on 2009-02-25 at 05:22:34ID: 23733284

Sorry the html I am using is as follows:

<html>
<applet code = "Mini_Applet_Browser.class"
archive="Mini_Browser_app.jar"

width = "300" height = "45"><applet>
<html>

As you can see code is already Mini_Applet_Browser. Sorry for the mix up. This html still does not allow the applet to be seen. A box with  error is displayed. When I click on it for more details, the same error message of class not be loaded is displayed.  

 

by: objectsPosted on 2009-02-25 at 15:38:03ID: 23739914

restart your browser and relaod the page
let me know what the new error is


 

by: akah123Posted on 2009-02-25 at 17:13:26ID: 23740511

With all of the html I have tried, I keep getting the same error message. The error message about the class not being loaded has always been there. The latest html is as follows:

<HTML>
<Head>
<Title> A Simple Program </Title>
<Body>
 
<Applet codebase = "Mini_Browser_app.jar"
Code="Mini_Applet_Browser"
ARCHIVE = "Mini_Browser_app.jar"
width="150" height="50">
</Applet>
 
</Body>
</HTML>

This html still causes the error box to be displayed. Do you have any idea as to why the class would not be loaded?

 

by: objectsPosted on 2009-02-25 at 17:16:41ID: 23740525

that html does not correspond to the error you posted in the question
please post the latest message, ensuring you have first restarted browser

 

by: akah123Posted on 2009-02-26 at 06:50:52ID: 23745181

The html that I posted before produces the following error

load: class Mini_Browser_app not found.
java.lang.ClassNotFoundException: Mini_Browser_app
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app

It seems to be trying to load Mini_Browser_app, even though in the code section I am telling it to load Mini_Applet_Browser. I have restarted the server twice and still the error message persists.

 

by: objectsPosted on 2009-02-26 at 14:20:31ID: 23750615

try:

<Applet
Code="Mini_Applet_Browser"
ARCHIVE = "Mini_Browser_app.jar"
width="150" height="50">
</Applet>
 

 

by: akah123Posted on 2009-02-26 at 23:59:17ID: 23753560

Ok, thanks very much, the html seems to work as expected when I run the applet locally.( C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\Mini_Browser_app.html) I  am using IE7. There is a prompt because it is a signed applet and then once you accept the simple web browser applet is displayed in IE7.
However when I am using apche tomcat and using the url: http://localhost:8080/Mini_Browser_app.html. I still am getting an error message. There is no prompt like there should be because it is a signed applet. It would appear to not be even reaching that point. Again the grey error box is displayed. The application fails to run. When I click on it for more details, it is as follows:

load: class Mini_Browser_app not found.
java.lang.ClassNotFoundException: Mini_Browser_app
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app

Because it is working locally, does this mean that there is a problem with my apche tomcat configuration? However I dont know if that would be the case because I am able to run other examples.

 

by: objectsPosted on 2009-02-27 at 00:01:02ID: 23753566

is the jar in the same directory as the html?

 

by: akah123Posted on 2009-02-27 at 05:47:43ID: 23755493

Yes they are. Both are in the C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT.

 

by: objectsPosted on 2009-02-27 at 11:58:17ID: 23759120

can you load the following with your browser:

http://localhost:8080/Mini_Browser_app.jar

whats the contents of the jar:

jar tvf Mini_Brower_app.jar

 

by: akah123Posted on 2009-03-01 at 04:16:26ID: 23767905

No I am unable to load http://localhost:8080/Mini_Browser_app.jar.
I have also attached what is in the jar file.

 

by: objectsPosted on 2009-03-01 at 04:25:11ID: 23767920

that would be your problem then. is the jar in the same directory as the html on the server?

 

by: akah123Posted on 2009-03-01 at 04:42:23ID: 23767963

Yes, I thought it was supposed to be?

 

by: akah123Posted on 2009-03-01 at 11:12:12ID: 23769206

I created another directory on the server in the root directory called 'browser_dir'. I moved my jar file into the newly created directory and kept my html file in root. It still gives me the same error as before about the class not bein loaded. The html I am using looks as follows:

HTML>
<Head>
<Title> A Simple Program </Title>
<Body>
 
<Applet
codebase = "http://localhost:8080/browser_dir"
Code="Mini_Applet_Browser"
ARCHIVE = "Mini_Browser_app.jar"
width="800" height="850">
</Applet>
 
</Body>
</HTML>

The error that I am still recieving is:
load: class Mini_Browser_app not found.
java.lang.ClassNotFoundException: Mini_Browser_app
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app
load: class Mini_Browser_app not found.
java.lang.ClassNotFoundException: Mini_Browser_app
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app
load: class Mini_Browser_app not found.
java.lang.ClassNotFoundException: Mini_Browser_app
      at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
      at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/Mini_Browser_app.jar/Mini_Browser_app.class
      at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
      at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      ... 7 more
Exception: java.lang.ClassNotFoundException: Mini_Browser_app

 

by: objectsPosted on 2009-03-01 at 14:25:48ID: 23770073

> Yes, I thought it was supposed to be?

It is supposed to be, but for some reason your server is not allowing it to be downloaded

20120131-EE-VQP-002

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