Errors with classes

Certain classes are not getting resolved in my code, and I'm not sure why, as I have all of the required jar files in the build path. For the most part, all of the other classes have been fine. Is there another file needed?

Examples of classes that I get errors on include:

RetrieveRecordsByValueCommand

RetrieveBlobCommand

MultiregionValue

PdfBlobRecord

These are the jar files I have included in the build path:

MDM4J.jar

mdm-admin.jar

mdm-common.jar

mdm-core.jar

mdm-data.jar

mdm-protocol.jar