private static void setStringAttribute(
     ILaunchConfigurationWorkingCopy workingCopy,
     GWTLaunchAttributes launchAttribute,
     String newValue) {
   String attributeQualifiedName = launchAttribute.getQualifiedName();
   if (shouldClearAttribute(launchAttribute.getDefaultValue(), newValue)) {
     clearAttribute(workingCopy, attributeQualifiedName);
   } else {
     workingCopy.setAttribute(attributeQualifiedName, newValue);
   }
 }
 public static void clearAttribute(
     ILaunchConfigurationWorkingCopy workingCopy, GWTLaunchAttributes launchAttribute) {
   workingCopy.setAttribute(launchAttribute.getQualifiedName(), (String) null);
 }