EDIT: Corrected the information after re-testing on a clean machine.
On a Windows TBSM server (I haven't tested this on other platforms), you need to copy the taddm-api-client.jar AND platform-api.jar files from the TADDM SDK into TWO different directories on the TBSM data server to get the Discovery Library Toolkit to work. Specifically, you need to copy taddm-api-client.jar to:
and copy platform-model.jar to:
I found that if you only copy the first file, the toolkit won't work at all, and won't generate any errors or messages of any use.