Github user afs commented on a diff in the pull request:
https://github.com/apache/jena/pull/151#discussion_r82505725
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/engine/http/QueryEngineHTTP.java
---
@@ -135,8 +135,7 @@ private QueryEngineHTTP(String serviceURI, Query query,
String queryString, Http
this.query = query;
this.queryString = queryString;
this.service = serviceURI;
- // Copy the global context to freeze it.
- this.context = new Context(ARQ.getContext());
+ this.context = ARQ.getContext();
--- End diff --
Because the application may update the global context after construction of
QueryEngineHTTP before it's use. Whether concurrency or not, issues can lead to
at least instability and maybe inconsistency. This copy-context-on-creation is
done throughout ARQ.
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