[jira] [Created] (JENA-2302) RowSetReaderJSON is not streaming

["Claus Stadler (Jira)" <ji...@apache.org>]

Claus Stadler created JENA-2302:
-----------------------------------

             Summary: RowSetReaderJSON is not streaming
                 Key: JENA-2302
                 URL: https://issues.apache.org/jira/browse/JENA-2302
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 4.5.0
            Reporter: Claus Stadler


Retrieving all data from out TDB2 endpoint with jena 2.5.0-SNAPSHOT is no longer streaming for the JSON format. I tracked the issue to RowSetReaderJson which reads everything into in memory (and then checks whether it is a SPARQL ASK result)

{code:java}
public class RowSetReaderJson {
        private void parse(InputStream in) {
            JsonObject obj = JSON.parse(in); // !!! Loads everything !!!

            // Boolean?
            if ( obj.hasKey(kBoolean) ) { ... }
    }
}
{code:java}


Streaming works when switching the to RS_XML in the example below:
{code:java}
public class Main {
    public static void main(String[] args) {
        System.out.println("Test Started");
        try (QueryExecution qe = QueryExecutionHTTP.create()
                .acceptHeader(ResultSetLang.RS_JSON.getContentType().getContentTypeStr())
                .endpoint("http://moin.aksw.org/sparql").queryString("SELECT * { ?s ?p ?o }").build()) {
            qe.execSelect().forEachRemaining(System.out::println);
        }
        System.out.println("Done");
    }
}
{code}

For completeness, I can rule out any problem with TDB2 because streaming of JSON works just fine with: 
curl --data-urlencode "query=select * { ?s ?p ?o }"  "http://moin.aksw.org/sparql"




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