Apache Jena is an open source Semantic Web framework for Java. It provides an API to extract data from and write to RDF graphs. The graphs are represented as an abstract "model". A model can be sourced with data from files, databases, URLs or a combination of these. A model can also be queried through SPARQL 1.1.
Jena is similar to RDF4J; though, unlike RDF4J, Jena provides support for OWL. The framework has various internal reasoners and the Pellet reasoner can be set up to work in Jena.
Jena supports serialisation of RDF graphs to:
a relational database