Karel Robot: Could not find or load main class

Question

I run this command to compile, it runs successfully:

javac -d . -cp .;KarelJRobot.jar StairClimber.java

Then I use this to try and run my class:

java -d –cp .;KarelJRobot.jar StairClimber

and I get this:

Error: Could not find or load main class ûcp

This is the entire class file:

import kareltherobot.*;

public class StairClimber {
    public static void main(String[ ] args)
    {   
        /* You fill this in */
        World.setVisible(true);
    }
}

I got the Karel Simulator from here:

http://csis.pace.edu/~bergin/KarelJava2ed/KJRDistribution060110.zip

If you get rid of all the "karel" stuff and just `System.out.println("hello world")`, does it still fail? — Ryan Stewart, Sep 21 '11 at 02:21
Yes it works fine without the Karel code but I have to remove karel out of the compile and run command. — Hudspeth, Sep 21 '11 at 02:23

score 5 · Accepted Answer · answered Sep 21 '11 at 02:40

5

java -d –cp .;KarelJRobot.jar StairClimber
--------^

Your cp argument hyphen is wrong. You need the - one next to 0 on your (US) keyboard. Do not copypaste the command from some PDF file or website. Enter the command all yourself.

java -d -cp .;KarelJRobot.jar StairClimber

answered Sep 21 '11 at 02:40

BalusC

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+1 nice catch. I totally missed the significance of the "ûcp" :\ – Ryan Stewart Sep 21 '11 at 02:45
I wish I could +1 you man, thanks so much. It was from a PDF. I copy and pasted from it. – Hudspeth Sep 21 '11 at 02:51
1

You're welcome. Hope that you'll stop copypasting code. Getting it out of your own fingers will end up it to be better remembered and practiced. Seriously. – BalusC Sep 21 '11 at 02:53

Saket · Answer 2 · 2011-09-21T02:46:57.430

-1

Try using the below (also, : instead of ;) :

java -cp .:KarelJRobot.jar StairClimber

edited Sep 21 '11 at 02:46

answered Sep 21 '11 at 02:41

Saket

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That would not have resulted in this error (how else would you explain it? and also that he successfully compiled it?). The colon is specific to *nix environments by the way. The semicolon is perfectly valid on windows environments. – BalusC Sep 21 '11 at 02:43

Karel Robot: Could not find or load main class

2 Answers2