code: protected void handleInvalidExcludes(List<String> invalidExcludes) {
  		StringBuilder message = new StringBuilder();
  		for (String exclude : invalidExcludes) {
  			message.append("\t- ").append(exclude).append(String.format("%n"));
  		}
  		throw new IllegalStateException(String
  				.format("The following classes could not be excluded because they are"
  						+ " not auto-configuration classes:%n%s", message));
  	}
docs: Handle any invalid excludes that have been specified.
  @param invalidExcludes the list of invalid excludes (will always have at least one
  element)