Exception in thread "main" java.lang.NoClassDefFoundError: sampl

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xcrazy - 20 Apr 2007 04:56 GMT

Hi, I know this is a common error, but this occurs only in some of my
programs.
I run java on windows XP SP2, jdk1.5
My sampl.java file is like this:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class swing_app {
    public static void main(String[] args) {
        JDesktopPane desktop = new JDesktopPane();
        desktop.add(desktop,BorderLayout.CENTER);
        JInternalFrame internalFrame = new JInternalFrame("Internal
Frame",true,true,true,true);
        internalFrame.setBounds(50,50,200,100);
        desktop.add(internalFrame,new Integer(1));
    }
}

It compiles giving me a "sampl.class" file but when i type this

>java sampl

I get this error: - Exception in thread "main"
java.lang.NoClassDefFoundError: sampl

I don't get this error in a simple "Hello world" program.....
This is how i've set my paths:

Path=c:\j2sdkee1.3.1\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot
%\system32\WBEM;%SYSTEMROOT%\system32\WBEMC:
\PROGRA~1\COMMON~1\AUTODE~1;.;C:\Java\jdk1.5.0_09\bin;c:\Java
\jdk1.5.0_09\lib;

CLASSPATH= .;C:\Java\jdk1.5.0_09\lib;C:\Java\jdk1.5.0_09\bin;C:
\j2sdkee1.3.1\bin;

Please help!!

Reply to this Message

Andrew Thompson - 20 Apr 2007 07:17 GMT

> Hi, I know this is a common error, ..

Multi-posting instead of cross-posting?
Please refrain from multi-posting, in future.
<http://www.physci.org/codes/javafaq.html#xpost>

Andrew T.

Reply to this Message

micro - 20 Apr 2007 07:34 GMT

> Hi, I know this is a common error, but this occurs only in some of my
> programs.
[quoted text clipped - 21 lines]
> I get this error: - Exception in thread "main"
> java.lang.NoClassDefFoundError: sampl

first :note that your class named "swing_app" not "sampl" it wil
compile giving you a "swing_app.class"
second :you should not add acontainer to it self

> desktop.add(desktop,BorderLayout.CENTER);

third you are using an internal frame so you should note that you will
not be able to see any thing unless you put that in a desktoppane then
in a frame
so try the following it will work:
import javax.swing.*;

class SwingApp {
public static void main(String[] args) {
JFrame f= new JFrame();
f.setSize(300, 300);
JDesktopPane desktop = new JDesktopPane();
f.setContentPane(desktop);
JInternalFrame internalFrame = new
JInternalFrame("internal frame");
internalFrame.setBounds(50,50,200,100);
internalFrame.setVisible(true);
desktop.add(internalFrame,null);
f.setVisible(true);
}

}

Reply to this Message

micro - 20 Apr 2007 07:35 GMT

first :note that your class named "swing_app" not "sampl" it wil
compile giving you a "swing_app.class"
second :you should not add acontainer to it self

> desktop.add(desktop,BorderLayout.CENTER);

Reply to this Message

Lew - 20 Apr 2007 13:20 GMT

xcrazy <sharathg...@gmail.com> wrote:

>> Hi, I know this is a common error, but this occurs only in some of my
>> programs.
[quoted text clipped - 6 lines]
>>
>> class swing_app {

Class names should start with an upper-case letter, not contain underscores
and start each word part with an upper-case letter, thus "SwingApp", by
convention.

Signature

Lew

Reply to this Message

Exception in thread "main" java.lang.NoClassDefFoundError: sampl

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