I am working with maven and importing the dependency “jme3-plugins”, which should have fixed the issue. The version of jmonkeyengine is “3.2.3-stable”.
In a typical desktop configuration, this registration is performed automatically when the AssetManager is created, while reading the General.cfg asset.
just a note, if you dont need to use ogre loader, blender/jme gltf exporter workflow seems to be stable now.(at least i seen only one serious animation issue that will be solved on days/weeks)