Stanford's Karel the Robot throws NullPointerException

Question

I have started taking the course Programming methodology(CS106A) available at stanford website. But I am not able to start the Stanford Karel in it.

I am using eclipse indigo classic 3.7.1 and Windows 7 64 bit OS..

I wrote the following code:

import stanford.karel.*;

public class CollectNewspaperKarel extends SuperKarel {
    // You fill in this part
    public void run(){
      move();
      move();
    }
}

It gives the error

Exception in thread "main" java.lang.NullPointerException
   at acm.program.Program.main(Program.java:917)
   at stanford.karel.Karel.main(Karel.java:202)

I followed some instructions given here but then got a blank screen as the output.

The assignment1 of stanford can be found here, and karel the robot of stanford is available here

Answer 1

hello bhuwansahni though I have written an answer before, but now I am writing the entire process to run Karel in any eclipse version.

1. Create a new project in your Eclipse (File-----> New-----> Java Project)

2. Load your assignment in the Created Project.

   step a:- Extract Assignment 1 in your desired folder.

   step b:- import the assignment (File-----> Import----->General-----> Files system-----> browse your folder and complete the importing.)

3. Now run it in a different way (Run-----> Run Configurations-----> )

   Step a:- Under Java Applet Create New Configuration.

   Step b:- Under Main write the Main Class stanford.karel.Karel

   Picture for **Step b of Step 3] http://i.stack.imgur.com/0LpI3.jpg

   Step c:- Under (x)= Arguments in Program Arguments write code=CollectNewspaperKarel

   Picture for **Step b of Step 3] http://i.stack.imgur.com/alIss.jpg

   Step d:- Apply and Run

4. Now Here comes the Karel the most Lovable Robot.

   Picture for **Step 3] URL:- (i.stack.imgur.com/d8SAa.jpg) put http:// in front to see it... as here I can't post more than two hyperlinks.

Answer 2

public class StoneMasonKarel extends SuperKarel {
    public static void main(String[] args) {
        stanford.karel.Karel.main(new String[] { "code="
                + StoneMasonKarel.class.getCanonicalName() });
    }
    public void run() {
    }
}

You need Java6.

In Eclipse:

1. Project >> Settings >> Java Compiler: Select 1.6
2. Right click Run button >> Run Configuration >> JRE Tab >> Alertnative JRE: Select/add your Java 6 path

Then I implement a main method for each project like the one above. For each rename StoneMasonKarel.class to whatever your class name is.