code: public static RuntimeException multiple(Iterable<Throwable> throwables) {
  		RuntimeException multiple = new RuntimeException("Multiple exceptions");
  		//noinspection ConstantConditions
  		if (throwables != null) {
  			for (Throwable t : throwables) {
  				//this is ok, multiple is always a new non-singleton instance
  				multiple.addSuppressed(t);
  			}
  		}
  		return multiple;
  	}
docs: Create a composite exception that wraps the given {@link Throwable Throwable(s)},
  as suppressed exceptions. Instances create by this method can be detected using the
  {@link #isMultiple(Throwable)} check. The {@link #unwrapMultiple(Throwable)} method
  will correctly unwrap these to a {@link List} of the suppressed exceptions. Note
  that is will also be consistent in producing a List for other types of exceptions
  by putting the input inside a single-element List.
  
  @param throwables the exceptions to wrap into a composite
  @return a composite exception with a standard message, and the given throwables as
  suppressed exceptions
  @see #addThrowable(AtomicReferenceFieldUpdater, Object, Throwable)