Add @NotNull to BeforeRoutePredicateFactory.Config. datetime

[apollyon4]

Question & Enhancement

1. I compared AfterRoutePredicateFactory and BeforeRoutePredicateFactory are quite similar but is diffrent about @NotNull.
   If there no reason I think should add @NotNull to BeforeRoutePredicateFactory.Config.datetime

2. I don't realy know about @Validated anotation works in predicates.
   I try few test with or without @Validated but it have no given.
   Could you remove @Validated in every predicates If there are no reason to apply @Validated?
   Because it require me to understanding @Validated when I make custom predicate.

[spencergibb]

It happens when configuration is bound from properties, similar to how it works in spring boot @ConfigurationProperties, it uses the same mechanism, so supporting constraints and @Validated.

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[apollyon4]

@spencergibb @spencergibb I still don’t fully understand the use of @validated in PredicateFactory.Config, but I believe it might not be crucial to this issue.

I looked three classes within the PredicateFactory.

public class HeaderRoutePredicateFactory extends AbstractRoutePredicateFactory<HeaderRoutePredicateFactory.Config> {
	@Validated
	public static class Config {
		@NotEmpty
		private String header;
	}

In HeaderRoutePredicateFactory, the header field is validated to ensure it is not empty.

public class AfterRoutePredicateFactory extends AbstractRoutePredicateFactory<AfterRoutePredicateFactory.Config> {
	public static class Config {
		@NotNull
		private ZonedDateTime datetime;
	}
}

Similarly, in AfterRoutePredicateFactory, the datetime field is checked for null values, but @Validated is not used here.

public class BeforeRoutePredicateFactory extends AbstractRoutePredicateFactory<BeforeRoutePredicateFactory.Config> {
	public static class Config {
		private ZonedDateTime datetime;
	}
}

BeforeRoutePredicateFactory is quite similar to AfterRoutePredicateFactory, but it’s missing the @NotNull annotation on the datetime field. It seems necessary to include this validation, as BeforeRoutePredicateFactory doesn’t currently check if the datetime field is null.

[spencergibb]

Yup, it's inconsistent. PRs welcome.