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https://issues.apache.org/jira/browse/JENA-1536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457776#comment-16457776
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Andy Seaborne commented on JENA-1536:
-------------------------------------
{{QuadAccSink}} supports the execution of SPARQL Update. It is not designed for
concurrent use. Parsing is single threaded.
This is especially important because {{rdfConnection.update}} should be inside
a transaction if local.
A "connection" is an ordered set of SPARQL-related operations. Order is likely
to matter to an application.
What implementation of {{RDFConnection}} is this?
Its javadoc says: `/** Accumulate quads into a Sink (including allowing
variables) during parsing. */`
and parsing is single threaded. Concurrent use is not in is design space.
> unsynchronized collection in jena.atlas.lib.SinkToCollection causes
> ArrayIndexOutOfBoundsException
> --------------------------------------------------------------------------------------------------
>
> Key: JENA-1536
> URL: https://issues.apache.org/jira/browse/JENA-1536
> Project: Apache Jena
> Issue Type: Bug
> Components: Base
> Reporter: Christopher Johnson
> Assignee: A. Soroka
> Priority: Major
> Attachments: AtlasSinkNonSynchronizedCollectionException.txt
>
>
> Attached is a stack trace that shows the issue.
> [^AtlasSinkNonSynchronizedCollectionException.txt]
> This is produced by a repeated client test through
> {noformat}
> RDFConnection.update{noformat}
> via this [Trellis
> method|https://github.com/trellis-ldp/trellis/blob/master/components/triplestore/src/main/java/org/trellisldp/triplestore/TriplestoreResourceService.java#L212-L227]
> that streams quads quite fast.
> Changing the method signature to this:
> {code:java}
> @Override
> public synchronized void send(T item) { c.add(item); }{code}
> Solves the problem for me.
>
>
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