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

[bsw2112]

hello all,

i am starting a introductory java course next week and thought it would be nice to at least try to write-compile-run a simple java program.

here is my code

class fun {
 public static void main(String[] arguments) {
  // My first Java program goes here
  String greeting = "Hello World";
  System.out.println(greeting);

 }
}

for some reason it's not letting me run it

after i installed the kit

in dos i write
java -version
and it gave me

java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

so i know that it can find the jdk1.3 folder

so i went to the bin folder and compiled the above program

javac c:\javafile\fun.java

it worked since i had no message and a file was created on the same level called fun.class

so then i tried to run it

java c:\javafile\fun

and this is the message i got

C:\jdk1.3\bin>java c:\javafile\fun
Exception in thread "main" java.lang.NoClassDefFoundError: c:\javafile\fun

i then looked in the appendix and tried to add this line to my autoexc.bat file (i have win 98)

SET CLASSPATH=%CLASSPATH%;.;C:\jdk1.3\lib\tools.jar;c:\jdk1.3

the book said that this should fix my problem but i get still the same error

can anyone tell me what i should check next?

why does it let me compile but not run?

help i'm stuck..


bsw

[bsw2112]

found my mistake,

i needed to run it from the same directory.
i was fooled because to compile it i needed to be in jkd1.3\bin
directory

bsw

[CornedBee]

For java you don't specify paths on the command line. You specify which class to run, and classes don't care about paths.
This is why you either need to be in the directory of the codebase or specify the directory of the codebase via the -classpath option.

[Dillinger4]

bsw2112 take note that any changes to the autoexec.bat file only take effect once the computer is rebooted.

[CornedBee]

And you might want to add c:\jdk1.3\bin to your PATH in autoexec.bat. Then you can compile from everywhere.