Could not find main class!
I tried some code I got from a book I recently bought it compiled ok but when I tried to run it in JPadPro I got the Java Virtual Machine Launcher warning saying 'Could not find the main class. Program will exit!' As far as I can see there is a main method so I am not to sure what the actual problem is. I pasted the code below hopefully someone can help, Dave.
* Copyright (c) 2000 David Flanagan. All rights reserved.
* This code is from the book Java Examples in a Nutshell, 2nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book (recommended),
* visit http://www.davidflanagan.com/javaexamples2.
package com.davidflanagan.examples.datatransfer;
import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
* This program demonstrates how to add simple copy-and-paste capabilities
* to an application.
public class SimpleCutAndPaste extends Frame implements ClipboardOwner
/** The main method creates a frame and pops it up. */
public static void main(String[] args) {
Frame f = new SimpleCutAndPaste();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { System.exit(0); }
f.pack();
f.setVisible(true);
/** The text field that holds the text that is cut or pasted */
TextField field;
* The constructor builds a very simple test GUI, and registers this object
* as the ActionListener for the buttons
public SimpleCutAndPaste() {
super("SimpleCutAndPaste"); // Window title
this.setFont(new Font("SansSerif", Font.PLAIN, 18)); // Use a big font
// Set up the Cut button
Button copy = new Button("Copy");
copy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { copy(); }
this.add(copy, "West");
// Set up the Paste button
Button paste = new Button("Paste");
paste.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { paste(); }
this.add(paste, "East");
// Set up the text field that they both operate on
field = new TextField();
this.add(field, "North");
* This method takes the current contents of the text field, creates a
* StringSelection object to represent that string, and puts the
* StringSelection onto the clipboard
public void copy() {
// Get the currently displayed value
String s = field.getText();
// Create a StringSelection object to represent the text.
// StringSelection is a pre-defined class that implements
// Transferable and ClipboardOwner for us.
StringSelection ss = new StringSelection(s);
// Now set the StringSelection object as the contents of the clipboard
// Also specify that we're the clipboard owner
this.getToolkit().getSystemClipboard().setContents(ss, this);
// Highlight the text to indicate it is on the clipboard.
field.selectAll();
* Get the contents of the clipboard, and, if we understand the type,
* display the contents. This method understands strings and file lists.
public void paste() {
// Get the clipboard
Clipboard c = this.getToolkit().getSystemClipboard();
// Get the contents of the clipboard, as a Transferable object
Transferable t = c.getContents(this);
// Find out what kind of data is on the clipboard
try {
if (t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
// If it is a string, then get and display the string
String s = (String) t.getTransferData(DataFlavor.stringFlavor);
field.setText(s);
else if (t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
// If it is a list of File objects, get the list and display
// the name of the first file on the list
java.util.List files = (java.util.List)
t.getTransferData(DataFlavor.javaFileListFlavor);
java.io.File file = (java.io.File)files.get(0);
field.setText(file.getName());
// If anything goes wrong with the transfer, just beep and do nothing.
catch (Exception e) { this.getToolkit().beep(); }
* This method implements the ClipboardOwner interface. It is called when
* something else is placed on the clipboard.
public void lostOwnership(Clipboard c, Transferable t) {
// Un-highlight the text field, since we don't "own" the clipboard
// anymore, and the text is no longer available to be pasted.
field.select(0,0);
}
Oh, no wonder I have such low "reading for comprehension" scores - that was a "package" statement, not an "import".
Thing is, your class would compile with this package statement there - but, the interpreter wouldn't be able to find it, 'cause the compiled class would be in a package called com.davidflanagan.examples.datatransfer accoding to the class file, but your interpreter would be looking for the class in the default package (if that makes sense). If executed on the command line you would likely see something like:
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleCutAndPaste (wrong name: com/davidflanagan/examples/datatransfer/SimpleCutAndPaste)
[pre]
Lee
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https://forums.oracle.com/thread/2559093
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Duplicate is locked.
Do not EVER multi--post. That is extremely bad forum etiquette. -
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Jar file error: could not find main class. program will exit
I have created a jar file using following command
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Another "could not find main class" thread
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Class File Editor
Source not found
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Message was edited by:
Kurisu -
Could not find main class - Java virtual machine launcher error
Hi,
I tried executing the following cmd, below is the following error:
<<command i executed>>
C:\Program Files\Java\jre1.5.0_09\bin>java -classpath "C:\Program Files\Java\jre1.5.0_09\lib\javaws.jar" com.sun.javaws.Main https://<IPddr>:8443/sample.jnlp
<<Error obtained>>
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Can you pls let me know how it can be resolved?
Thanks in advance
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<<command i executed>>
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* Program: Student.java
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* Descrip:
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* for the class
public class Student
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private String strId;
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private String strUnits;
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Ok Ok OK I got the solution for you ,this is what you do you put your hands inbetweenj you leggs and run around in a circle can scream me nuts me nuts me nuts are on fire,then come back and tell use if the problem is solved or not
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Blank screen after reboot - M30-70
Hi @ All, I have received 5 Lenevo M30-70's last week (1st April 2015) - all brand new in the box (with Windows 7 x64 Professional pre-installed as the OS). I've successfully setup one laptop with all of our standard applications within our domain -
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How to get the path when i select a directory or a file in a JTree
How to get the path when i select a directory or a file in a JTree
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Xslt multi conditions checking.
Hi, Please could you help me how I can achieve my requireemnt through xslt. in an xml, I will pass the belwo records <Main> <HOME RecNo="1"> <Articles useFilter="True" CID="LGTS22" BVal="MUG"/> <Articles useFilter=
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How to make versioning of resources customizable, present in resources tab of a workbench
hi all i am new to workbench or to say new bee for it i m creating the service through it while creating service i use the diffrent .xdp files which are present in my resources tab. when we modifiy the .xdp files the versioning updatation is done an
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What is the best way to back up iphoto "files"?
I use time machine but this backs up the "library". I want to back up the files. I have about 40000 photos that I just want to put on an external drive. If I highlight too many photos or events in iphoto and drag them into a new folder, it crashes