I recently upgraded from 2.9.2 to the new knime version 2.10.1 (linux, 64 bit). When modifying the nodes using an interactive view to fit the new API, I got an error that a depending .class file misses classes from the jackson-annotations library. I installed jackson-annotations-2.4.0.jar and added it to the build path. After that everything worked nicely. So maybe this file is missing in the release.