When retrieving the metadata for an image I receive the following exceptions on server and client.

I receive the following exception on the server:
SEVERE: Servlet.service() for servlet tupelo threw exception
com.hp.hpl.jena.query.lang.QNameException: Line 1, column 192: Unresolved qname: :
at com.hp.hpl.jena.query.lang.ParserBase.fixupQName(ParserBase.java:211)
at com.hp.hpl.jena.query.lang.ParserBase.createURIfromQName(ParserBase.java:159)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.QName(SPARQLParser.java:1624)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.IRIref(SPARQLParser.java:1604)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GraphTerm(SPARQLParser.java:1007)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.VarOrTerm(SPARQLParser.java:924)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GraphNode(SPARQLParser.java:887)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.ObjectList(SPARQLParser.java:749)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.PropertyListNotEmpty(SPARQLParser.java:734)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.Triples1(SPARQLParser.java:698)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.Triples(SPARQLParser.java:642)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GraphPattern(SPARQLParser.java:458)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GroupGraphPattern(SPARQLParser.java:431)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.WhereClause(SPARQLParser.java:297)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.SelectQuery(SPARQLParser.java:137)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.Query(SPARQLParser.java:26)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.CompilationUnit(SPARQLParser.java:18)
at com.hp.hpl.jena.query.lang.ParserSPARQL.parse(ParserSPARQL.java:30)
at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:84)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:51)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:38)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:26)
at org.tupeloproject.rdf.query.sparql.SparqlOperatorFactory.newOperator(SparqlOperatorFactory.java:383)
at org.tupeloproject.rdf.query.sparql.SparqlOperatorFactory.newOperator(SparqlOperatorFactory.java:399)
at org.tupeloproject.server.HttpTupeloServlet.doMquery(HttpTupeloServlet.java:240)
at org.tupeloproject.server.HttpTupeloServlet.doPost(HttpTupeloServlet.java:623)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:636)

and the following on the client
SEVERE: Servlet.service() for servlet tupelo threw exception
com.hp.hpl.jena.query.lang.QNameException: Line 1, column 192: Unresolved qname: :
at com.hp.hpl.jena.query.lang.ParserBase.fixupQName(ParserBase.java:211)
at com.hp.hpl.jena.query.lang.ParserBase.createURIfromQName(ParserBase.java:159)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.QName(SPARQLParser.java:1624)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.IRIref(SPARQLParser.java:1604)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GraphTerm(SPARQLParser.java:1007)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.VarOrTerm(SPARQLParser.java:924)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GraphNode(SPARQLParser.java:887)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.ObjectList(SPARQLParser.java:749)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.PropertyListNotEmpty(SPARQLParser.java:734)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.Triples1(SPARQLParser.java:698)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.Triples(SPARQLParser.java:642)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GraphPattern(SPARQLParser.java:458)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.GroupGraphPattern(SPARQLParser.java:431)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.WhereClause(SPARQLParser.java:297)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.SelectQuery(SPARQLParser.java:137)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.Query(SPARQLParser.java:26)
at com.hp.hpl.jena.query.lang.sparql.SPARQLParser.CompilationUnit(SPARQLParser.java:18)
at com.hp.hpl.jena.query.lang.ParserSPARQL.parse(ParserSPARQL.java:30)
at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:84)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:51)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:38)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:26)
at org.tupeloproject.rdf.query.sparql.SparqlOperatorFactory.newOperator(SparqlOperatorFactory.java:383)
at org.tupeloproject.rdf.query.sparql.SparqlOperatorFactory.newOperator(SparqlOperatorFactory.java:399)
at org.tupeloproject.server.HttpTupeloServlet.doMquery(HttpTupeloServlet.java:240)
at org.tupeloproject.server.HttpTupeloServlet.doPost(HttpTupeloServlet.java:623)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:636)