db4o Developer Community

Hi, I am a student and I am trying to combine db4o 6.4 with jena 2.5.4. The idea is to store Ontologies using db4o. So, after I import an owl file, I retrieve its OntClasses and I store them using db.set(...). The problem is, that after I close the db (db.close()) and opening it again (creating a new ObjectContainer) I can't retrieve any of the ...