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https://issues.apache.org/jira/browse/JENA-576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15558287#comment-15558287
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ASF GitHub Bot commented on JENA-576:
-------------------------------------
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.
> Upgrade Apache HTTP Client to 4.3
> ---------------------------------
>
> Key: JENA-576
> URL: https://issues.apache.org/jira/browse/JENA-576
> Project: Apache Jena
> Issue Type: Dependency upgrade
> Components: ARQ
> Affects Versions: Jena 2.11.0
> Reporter: Rob Vesse
> Assignee: Rob Vesse
> Priority: Minor
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> As of 2.11.0 ARQ centralizes all HTTP operations through HttpOp which relies
> on Apache HTTP Client. Currently we are using 4.2.3 while the latest stable
> release is actually 4.3.1
> Therefore we should look at upgrading our code to use the latest version
> which may entail some refactoring since there appears to have been some
> breaking changes across the minor version bump which users have seen in usage
> - e.g.
> https://github.com/pyvandenbussche/sparqles/issues/9#issuecomment-27220738
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