Unable to run Java program

Question

I'm having trouble running my very first piece of java. I was able to compile it and produce a .class file, but then I was unable to run it for some reason. It might have something to do with the directory path. The file name is "Simple" and I have this saved in a folder called "newfolder".

I was able to compile Simple.class by typing in "javac newfolder/Simple.java", but when I typed in "java newfolder/Simple", this message appeared:

java: exception in thread “main” java.lang.NoClassDefFoundError: newfolder/Simple (wrong name: Simple)

Here is the original code that I typed in:

// This is a simple Java program.

public class Simple
{
   public static void main(String[] args)
   {
     System.out.println("Hello World");
   }
}

I think that the answer here is up my alley, but I've somehow been unable to get it to work for me, so any assistance would be greatly appreciated. Thanks in advance!

Look into your packaging of your class and the way you call the class to execute. The correct format of running java program is "java -cp [classpath] [package path]/JavaClassName" — Yogesh Patil
– Yogesh Patil, Commented Jan 31, 2013 at 14:06

JohnnyO · Accepted Answer · 2013-01-31 14:05:35Z

3

Try running the Java file from inside the newfolder/

cd newfolder/
java Simple

answered Jan 31, 2013 at 14:05

JohnnyO

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1 Comment

Devora Over a year ago

Thank you! This was exactly what I needed to get things running :)

Peter Lawrey · Accepted Answer · 2013-01-31 14:04:53Z

1

I suspect you want to use an IDE which sets up these things for you but you need

package newfolder;

at the start.

answered Jan 31, 2013 at 14:04

Peter Lawrey

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