undocumented: @DnAttribute demands String type

[edysli]

While trying to annotate a field of type java.time.Instant with @DnAttribute, I got the following exception in my tests:

org.springframework.ldap.odm.core.impl.InvalidEntryException: Can't get Id field from Entry [...]

Caused by: org.springframework.ldap.odm.core.impl.MetaDataException: private java.time.Instant expiredTimestamp is of type class java.time.Instant, but only String attributes can be declared as @DnAttributes

Note that I do have Converters registered to convert between Instant and String, both ways.

If @DnAttribute is really that much type-intolerant, this must be mentioned in its Javadoc and in the reference documentation.