Blender Buffer Clearing should be performed prior to exporting any model from Blender.
To export your models as Ogre XML meshes with materials:
jMonkeyEngine requires a material file to be named the same name as the model so prior to opening the export dialog make it so. The model will export files named
ModelName.material, plus (optionally)
ModelName.skeleton.xml, and some JPG files.
Open the menu
to open the exporter dialog.
File Pathfield: Select a target sub-directory of your
Project Assets/Textures/directory. E.g.
Project Assets/Textures/ModelName/. See Best Practices.
In the panel at the bottom left of the export window toggle the following export settings:
Click Export Ogre.