Jira issue originally created by user usver:
When using single table inheritance, discriminator field doesn't created as nullable... so when you persist Base class.. it has null value and you get MySQL violation
Comment created by usver:
Some code for this issue
As was pointed out by Bittarman on IRC, base class was not included in DiscriminatorMap...
Closing as not an issue
Not an issue
Issue was closed with resolution "Invalid"