Hi Gaurav,
Here the ConfirmationAction tries to resolve a translation key and passes it on
to MessageFormat#format. If no such key can be found, it will resolve to
'null', and passing null to MessageFormat throws the NPE. Arguably, we don't
have any default translation when none is provided, and we could probably be
more lenient there.
The translation keys should be defined in your
mgnl-18n/<your-app>_en.properties, with for example the following format
(typically depends on the I18nKeyGenerator):
actions.<action-name>.confirmationHeader=e.g. Confirm what to do with
{0,choice,1#this item|1<these {0} items}?
actions.<action-name>.confirmationMessage=... (confirmation
description/consequences)
We pass the selection count as param to MessageFormat, so you may pluralize as
above.
Cheers,
Mika
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