spring.messages.cache-duration does not define a DurationUnit

[snicoll]

The cacheDuration property has no default but we set it to -1 in the auto-configuration if no value is specified. I guess having -1ms as the default value is a bit funky?

Right now we document -1 in the appendix so we should make up our mind about this one. Either remove the default from the documentation or set it in the property. Since that default value is a bit special, I am tempted to remove it from the appendix.

[snicoll]

@philwebb I think that this property is missing DurationUnit right? It used to be seconds in 1.x.

[philwebb]

@snicoll I may well have missed it during the migration.

[snicoll]

Looks like it, I've renamed the issue to expand its scope.