ISIS-1012 I've found that Kitchensink app doesn't behave correctly for Joda-Time's LocalDateTime:
org.apache.isis.viewer.wicket.ui.components.scalars.jodatime.JodaLocalDateTimePanel doesn't show the scalar value.
Partially the problem has been solved by moving
applied on the property getters.
But it appeared that the actual problem is that DataNucleus 3.x and 4.x do not support Joda-Time's LocalDateTime. There is support for Joda-Time's LocalDate and JSR310/ThreeTen/JDK8 LocalDateTime though.
This ticket is to document the bug. Since there is no urgent need for supporting this type its priority is set to "Minor".
Thanks to Dan for the directions!