The following snippet may produce the error. SWT.DEL is marked as error. But the file can be compiled without any error. I also tried to clear the system folder but no help. ------------- import org.eclipse.swt.SWT; public class Test { public static void main(String[] args) { char c = 'a'; switch (c) { case SWT.CR: break; case SWT.DEL: break; } } } -------------