[x]
Posted via EE Mobile

Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.
Question
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!
8.2

Can not load applet class into browser

Asked by akah123 in Java Editors & IDEs, Web Servers, Computer Servers

Tags: apache tomcat applet jar signed web browser

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
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:
88:
89:
90:
91:
92:
93:
94:
95:
96:
97:
98:
99:
100:
101:
102:
103:
104:
105:
106:
107:
108:
109:
110:
111:
112:
113:
114:
115:
116:
117:
118:
119:
120:
121:
122:
123:
124:
125:
126:
127:
128:
129:
130:
131:
132:
133:
134:
135:
136:
137:
138:
139:
140:
141:
142:
143:
144:
145:
146:
147:
148:
149:
150:
151:
152:
153:
154:
155:
156:
157:
158:
159:
160:
161:
162:
163:
164:
165:
166:
167:
168:
169:
170:
171:
172:
173:
174:
175:
176:
177:
178:
179:
180:
181:
182:
183:
184:
185:
186:
187:
188:
189:
190:
191:
192:
193:
194:
195:
196:
197:
198:
199:
200:
201:
202:
203:
204:
205:
206:
207:
208:
209:
210:
211:
212:
213:
214:
215:
216:
217:
218:
219:
220:
221:
222:
223:
224:
225:
226:
227:
228:
229:
230:
231:
232:
233:
234:
235:
236:
237:
238:
239:
240:
241:
242:
243:
244:
245:
246:
247:
248:
249:
250:
251:
252:
253:
254:
255:
256:
257:
258:
259:
260:
261:
262:
263:
264:
265:
266:

//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);
	            }
	        }
	    }
	    
	   
 
}
Related Solutions: ClassCastException when loading Applet into Browser
 
Related Solutions
Keywords: Can not load applet class into browser
Title
1 Can not load class file from jar in tomca…
 
Loading Advertisement...
 
[+][-]02/24/09 03:02 PM, ID: 23727850Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/25/09 05:22 AM, ID: 23733284Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/25/09 03:38 PM, ID: 23739914Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/25/09 05:13 PM, ID: 23740511Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/25/09 05:16 PM, ID: 23740525Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/26/09 06:50 AM, ID: 23745181Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/26/09 02:20 PM, ID: 23750615Accepted Solution

View this solution now by starting your 30-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

About this solution

Zones: Java Editors & IDEs, Web Servers, Computer Servers
Tags: apache tomcat applet jar signed web browser
Sign Up Now!
Solution Provided By: objects
Participating Experts: 1
Solution Grade: B
 
[+][-]02/26/09 11:59 PM, ID: 23753560Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/27/09 12:01 AM, ID: 23753566Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/27/09 05:47 AM, ID: 23755493Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/27/09 11:58 AM, ID: 23759120Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]03/01/09 04:16 AM, ID: 23767905Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]03/01/09 04:25 AM, ID: 23767920Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]03/01/09 04:42 AM, ID: 23767963Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]03/01/09 11:12 AM, ID: 23769206Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]03/01/09 02:25 PM, ID: 23770073Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
 
Loading Advertisement...
20091111-EE-VQP-89 - Hierarchy / EE_QW_3_20080625