> .toString();
> }
>
> public static final DockerTemplateOptions NONE = new
> DockerTemplateOptions();
>
> public DockerTemplateOptions volumes(Map<String, String> volumes) {
> - this.volumes = Optional.<Map<String, String>>
> of(ImmutableMap.copyOf(volumes));
> + for (Map.Entry<String, String> entry : checkNotNull(volumes,
> "volumes").entrySet()) {
> + checkNotNull(entry.getKey(), "host paths must not be null");
> + checkNotNull(entry.getValue(), "container paths must not be null");
> + }
I couldn't remember. So, do you think we get a useful enogh error when we
create an `ImmutableMap` from a `HashMap` with nulls in it? If so, we just need
the `checkNotNull(input)` type validation, and I'll update the PR
appropriately. _**Checked** and it does a `checkEntryNotNull` so we're all good_
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