JUnit4 + Eclipse "An internal error occurred during Launching"

Question

I'm trying to run JUnit4 test cases on Eclipse 3.4.2 but it's not even starting for me. I have the junit-4.7.jar in my build path and the test application.

Here is a simple example that illustrates my problem

package test;
import org.junit.Before;
import org.junit.Test;

public class UTest {    
    @Test
    public void test() {
    }

    @Before
    public void setUp() throws Exception {
    }
}

This compiles fine

Then I do "Run JUnit Test case" from Eclipse and I get an error dialog with this message

"Launching UTest' has encountered a problem
An internal error occurred during: "Launching UTest".
java.lang.NullPointerException

What causes these NullPointerExceptions? What am I doing wrong?

Answer 1

What worked for me after trying everything:

1. Go to help
2. Install New Software
3. Work with: Juno
4. Programming languages (expand it)
5. Install Java Development Tools
6. Restart

It works :)

Answer 2

I was able to fix this just by deleting the workspace and the Eclipse directory and starting over.