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" -- This message was sent by Atlassian Jira (v8.20.1#820001)