For type RDFJSON the mimetype is spelled wrong: (applicatoin). It should be application.
public final static String RDFJSON   = "applicatoin/rdf+json"
/**
- 
Some static constants to provide enum-like access 
- 
to MimeTypes in use by the Semantics endpoints.
 */
 public final class RDFMimeTypes {
 public final static String NTRIPLES  = "application/n-triples";
 public final static String TURTLE    = "text/turtle";
 public final static String N3        = "text/n3";
 public final static String RDFXML    = "application/rdf+xml";
 public final static String RDFJSON   = "applicatoin/rdf+json";
 public final static String NQUADS    = "application/n-quads";
 public final static String TRIG      = "text/trig";
 public final static String TRIPLEXML = "application/vnd.marklogic.triples+xml";