Publishing using RSE to server fails with NPE

Steps to reproduce are:
1) Create rse as7 server
2) create dynamic web proj
3) add to server
4) right-click module, click full-publish

Error: NPE deep in the publish method code. This is caused primarily by RSEPublishMethod.publishStart(etc) not being reached. This method caches the server behavior for later reference. The superclass is reached for this method, because the subclass has the wrong signature. The NPE throws an NPE error dialog up (within the context of a failed publish).

this is a regression from the api sorting 1 week ago, where interfaces were pushed into the api rather than concrete impl classes.