Exception in thread "main" java.lang.NoClassDefFoundError
Hi,
I am using Windows XP Service pack 2. with jdk j2sdk1.4.1_01.
I was able to compile the LeakExample.java. I have set the classpath every thing. When i Execute LeakExample using java LeakExample Iam able to see the output.
The above steps works if there is no package declared. I have created the directories according to the package specified in the code.
When i declare Packages It throws the below error
Exception in thread "main" java.lang.NoClassDefFoundError: LeakExample (wrong na
me: demos/memorydebugger/leakexample/LeakExample)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:250)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
The source code i am testing is below.
package demos.memorydebugger.leakexample;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class LeakExample extends JFrame {
JPanel panel = new JPanel();
JButton buttons[] = new JButton[100];
int numButtons = 0;
static boolean fixed = false;
public LeakExample() {
super("Leak Example");
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
panel.setLayout(new FlowLayout() );
getContentPane().add("Center", panel);
JPanel addRemovePanel = new JPanel();
JButton addBtn = new JButton("Add");
addBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addButtonToPanel();
}
});
addRemovePanel.add(addBtn);
JButton removeBtn = new JButton("Remove");
removeBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
removeButtonFromPanel();
}
});
addRemovePanel.add(removeBtn);
getContentPane().add("North", addRemovePanel);
}
public void addButtonToPanel() {
if ( numButtons < buttons.length ) {
JButton btn = new JButton(String.valueOf( numButtons ) );
buttons[numButtons++] = btn;
panel.add(btn);
panel.validate();
panel.repaint();
}
}
public void removeButtonFromPanel() {
if ( numButtons > 0 ) {
panel.remove(buttons[--numButtons]);
if(fixed) {
buttons[numButtons] = null;
}
panel.validate();
panel.repaint();
System.gc();
}
}
static public void main(String args[]) {
if (args.length > 0) {
if (args[0].equals("fix")) {
fixed = true;
}
}
JFrame frame = new LeakExample();
frame.setSize(300, 200);
frame.setVisible(true);
}
} // End of class
Please let me know where iam going wrong.
Regards,
manju
