Using explicit repositories and an oracle database. When trying to update a managed object with a property typed as ['number', 'null'] you will get an error:
Caused by: java.lang.NullPointerException
After further investigation, it was found that in ExplicitTableHandler.java, the numbers can't be null even though explicitly set the type to ['number', 'null'].
Attribute as defined in the managed.json configuration file:
The issue appears that number can't be NULL anymore on the 6.5.X version of IDM.