> +import com.google.common.base.Objects.ToStringHelper;
> +import com.google.common.collect.ImmutableList;
> +
> +/**
> + * Autoscale Group Instance (as in hardware instance). Part of the group
> state.
> + *
> + * @see GroupState#getGroupInstances()
> + * @author Zack Shoylev
> + */
> +public class GroupInstance {
> + private final String id;
> + private final ImmutableList<Link> links;
> +
> + @ConstructorProperties({ "id", "links" })
> + protected GroupInstance(String id, ImmutableList<Link> links) {
> + this.id = checkNotNull(id, "id should not be null");
Elsewhere the error message pattern is `x required`. Minor point, though ;-)
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