Running errors - still unsolved

Question

i am getting a runtime error when i run java programs with java command.
i'm using JDK1.4 beta version. the program is compiling smoothly. the error is when running it. i've set all corresponding paths for sure and it's working on other computers.
the following is one program that i tried:
import java.io.*;
class App
{ public static void main(String[] args)
{ System.out.println("HEllo");
the error i got was as follows:
Exception in thread "main" java.lang.NoClassDefFoundError: App
the file name for saving was also App.java
all other programs are showing the same error......can any one help me out of this....... :(

Answer 1

It's probably your classpath. The programme sounds like the one in all the books that everyone does first. Getting your first java program to work can be such a drag - we've all been there.
Assuming your running a windows OS
1. Go to start
2. Click on run
3. Type in sysedit
4. The top file should be your 'auto-execute bat' file
5. This is where you need to enter a path so that your DOS shell knows where to look to compile and run your creations
On my computer it is;-
set JAVA_HOME=C:\jdk1.3.1
PATH C:\WINDOWS;C:\WINDOWS\WINDOWS;C:\DOS;C:\jdk1.3.1\BIN
You probably have a more recent version than me so change this bit
"jdk1.3.1" to "j2sdkee1.4" or whatever it is you downloaded from the web or CD, then restart your computer and try compiling your program again.
As the previous submission says, in order to have program to run the compiler: alias 'javac' has to have created a classfile, so when you type;-
jdk1.4.1>javac myProgramme.java
If there are no errors it blinks a couple of times and then does this
jdk1.4.1>
Apparently nothing, but it means your code has been compiled. Then when you type;-
jdk1.4.1>java myProgramme
Hello World
it should return the string value from System.out.println("some words");
Hope this sets you on your way and welcome to java!