According the proyect proposal sent to the Google Summer Code Program and as discussed with the community of Marmotta, the migration from Sesame 2.7 to RDF4J was splitted in three partial migrations through intermediate versions. It's a detailed explanation of the changes done in Apache Marmotta while moving to RDF4J. First, we explain the changes done from Sesame 2.7.16 to 2.8.11. Second, Sesame 2.8.11 to Sesame 4 and finally from Sesame 4 to RDF4J 2.
Road to Sesame 2
Road to Sesame 4