Sebastian Trüg created JENA-1702:
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Summary: InputStream for HTTP constructModel queries are not closed
Key: JENA-1702
URL: https://issues.apache.org/jira/browse/JENA-1702
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 3.10.0
Reporter: Sebastian Trüg
I am accessing a Fuseki installation as follows:
{code:java}
String uri = fusekiHost + "/" + dataset;
RDFConnection conn = RDFConnectionFuseki.create().destination(uri).build();
try(RDFConnection conn = createConnection(dataModelDs)) {
Model model = conn.queryConstruct("construct { ?s ?p ?o . } where { ?s ?p ?o
. }");
return model;
}{code}
The problem is that after 5 of these requests the Spring boot application this
code runs in blocks due to the PoolingHttpClientConnectionManager running out
of free routes.
After lots of debugging I noticed that the InputStream that is used to read the
data is never closed.
InputStreams from "select" requests are closed in QueryEngineHTTP::close due to
"retainedConnection" being set.
The same is not true for "construct" queries since their results are parsed via
RDFDataMgr which does not close the InputStream.
I do not understand the code well enough to propose a proper solution but maybe
just setting "retainedConnection" for construct queries would be enough? Either
way, I think the stream needs to be closed somehow.
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