java.lang.NoClassDefFoundError when i run java file from terminal

Question

I am a java newbie. I have been using Eclipse to test a simple java class (named NewHelloWorld) and it runs fine in the console. When I try to do the same thing from a termi

Answer 1

cd up to the root package. Most of the cases it will be src folder in the Project if created from eclipse IDE.

java -cp . org.kodeplay.kodejava.NewHelloWorld should work

java org.kodeplay.kodejava.NewHelloWorld should also work. I tried both the things and it works fine in both the case

Answer 2

wrong name: org/kodeplay/kodejava/NewHelloWorld

cd up to the package root, so that you're in the folder containing org folder and then do

java -cp . org.kodeplay.kodejava.NewHelloWorld

Answer 3

Go to the package root directory (the parent directory of org) and run:

java -cp .:$CLASSPATH org.kodeplay.kodejava.NewHelloWorld

Also I wouldn't put . to my CLASSPATH permanently (in .bashrc, .bash_profile or /etc/profile) it may lead to undesired behavior.

Answer 4

The error message gives you a clue:

(wrong name: org/kodeplay/kodejava/NewHelloWorld)

It looks like your class is called org.kodeplay.kodejava.NewHelloWorld. The Java command line needs to know the fully qualified class name:

java -cp . org.kodeplay.kodejava.NewHelloWorld

should do the trick.

Answer 5

I had a similar problem running a HelloWorld program I had written with a text editor on Mac OS X. It ran fine on a remote Linux box, but running it from home directory I got the dreaded NoClassDefFoundError.

Found that I could fix it either by running as:

java -cp . HelloWorld

or, without the classpath qualifier, after adding the current directory to my bash CLASSPATH for the current session:

export CLASSPATH=.