Class not found test.TestIndexBean error in Eclipse

[albert kao]

Running my junit 3 test program in Eclipse has the "Class not found test.TestIndexBean" error even though I added the directory proj\build\classes (which has the TestIndexBean.class) to the Run/Debug settings/Classpath/User Entries menu in Eclipse.

java.lang.ClassNotFoundException: test.TestIndexBean
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClass(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClasses(RemoteTestRunner.java:425)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:445)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

package test;

import junit.framework.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;



public class TestIndexBean extends TestCase {
    protected void setUp() throws Exception {
        //...
    }

}