I'm using Adapter scenario with sublasses and would like to exclude Validator classes form database generic project. I would like to know if it is possible to do this, and if it is, how can this be done.

this is not possible. The entity classes require the existence of the validator classes.

You can use a copy of the generator config you're using and in there change <parameter name="failWhenExistent" value="true"/> into <parameter name="failWhenExistent" value="false"/>

so these files get overwritten every time.