> +
> +   static class ServerStatusPredicate implements Predicate<String> {
> +
> +      private final ProfitBricksApi api;
> +      private final Server.Status expectedStatus;
> +
> +      public ServerStatusPredicate(ProfitBricksApi api, Server.Status 
> expectedStatus) {
> +         this.api = checkNotNull(api, "api must not be null");
> +         this.expectedStatus = checkNotNull(expectedStatus, "expectedStatus 
> must not be null");
> +      }
> +
> +      @Override
> +      public boolean apply(String input) {
> +         String[] ids = input.split(",");
> +         
> +         checkNotNull(input, "server id");

Better check it before calling split? :)

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