SDK for 2.5.1 has incomplete javadocs

The .../knime_doc/javadoc/ directory in the 2.5.1 SDK has what looks to be only a subset of the complete javadocs which could be found in the 2.4.2 SDK directory of the same name.

Is this a known problem with the SDK deployment, or should consumers of the SDK treat the 2.5.1 like a diff and copy over the new files, or ... ?

Yes, you are right, some files are missing because of a configuration problem during the build process. It is fixed in 2.5.2. Thanks for reporting!