Hi Lorena JenaReaderRdfJson is for reading a JSON serialization of RDF. The serialization you are trying to read is the JSON serialization of SPARQL Results which is completely different.
I notice you say that you use a CONSTRUCT query but the results you show are the SPARQL Results JSON format which should only be used for ASK/SELECT queries. If Virtuoso is replying with that to your CONSTRUCT query then they are behaving incorrectly and you should report a bug to them. If you genuinely expect SPARQL results instead then use ResultSetFactory.fromJSON() which will give you a ResultSet object. Rob On 6/25/12 3:14 PM, "lorena" <[email protected]> wrote: >Hi: > >I'm trying to process the results of performing a CONSTRUCT query on >Virtuoso using apache-jena-2.7.0-incubating >[1] shows the JSON String I would like to read (schemaStr). > >Here is an extract of my code: > >SysRIOT.wireIntoJena(); >Model modelSchema = ModelFactory.createDefaultModel(); >RDFReader schemaReader = new JenaReaderRdfJson() ; > >StringReader s = new StringReader(schemaStr); >schemaReader.read(modelSchema, s, ""); > >And I receive the following exception caused in the line that executes >the read: > >com.hp.hpl.jena.shared.JenaException: org.openjena.riot.RiotException: >[line: 2, col: 3 ] Relative IRI: head > at >org.openjena.riot.system.JenaReaderRIOT.readImpl(JenaReaderRIOT.java:150) > at org.openjena.riot.system.JenaReaderRIOT.read(JenaReaderRIOT.java:54) > .................... > > > >It seems to have trouble reading the "head" section. >My questions: >Is Virtuoso JSON output compatible with what JenaReaderRdfJson expects to >read? >Am I missing something else? >I'm using the empty string ("") as base URI in the read method, but I >don't understand what is the read method expecting in this field. > >Thanks in advance >Lorena > > > >[1] >{ "head": { "link": [], "vars": [ "s", "p", "o" ] }, > "results": { "distinct": false, "ordered": true, "bindings": [ > { "s": { "type" : "uri", "value" : "_:vb43419" } , "p": { "type" : >"uri", "value" : "http://purl.org/olap#hasAggregateFunction"; } , "o": >{ "type" : "uri", "value" : "http://purl.org/olap#sum"; }}, > { "s": { "type" : "uri", "value" : "_:vb43418" } , "p": { "type" : >"uri", "value" : "http://purl.org/olap#level"; } , "o": { "type" : >"uri", "value" : "http://example.org/householdCS#year"; }}, > { "s": { "type" : "uri", "value" : >"http://example.org/householdCS#household_withoutGeo"; } , "p": { >"type" : "uri", "value" : "http://purl.org/linked-data/cube#component"; >} , "o": { "type" : "uri", "value" : "_:vb43418" }}, > { "s": { "type" : "uri", "value" : >"http://example.org/householdCS#household_withoutGeo"; } , "p": { >"type" : "uri", "value" : "http://purl.org/linked-data/cube#component"; >} , "o": { "type" : "uri", "value" : "_:vb43419" }}, > { "s": { "type" : "uri", "value" : "_:vb43419" } , "p": { "type" : >"uri", "value" : "http://purl.org/linked-data/cube#measure"; } , "o": { >"type" : "uri", "value" : "http://example.org/householdCS#household"; >}}, > { "s": { "type" : "uri", "value" : >"http://example.org/householdCS#householdCS"; } , "p": { "type" : >"uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type"; } , >"o": { "type" : "uri", "value" : >"http://purl.org/linked-data/cube#DataStructureDefinition"; }} ] } }
