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Posted to jira@jena.apache.org by "Andy Seaborne (Jira)" <ji...@apache.org> on 2022/06/17 14:00:00 UTC
[jira] [Commented] (JENA-2333) Sorting by labels in SPARQL query fail
[ https://issues.apache.org/jira/browse/JENA-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555625#comment-17555625 ]
Andy Seaborne commented on JENA-2333:
-------------------------------------
Hi [~litvinovg]
The test works for me (exits with counter being zero).
What operating system are you using?
Please try:
{code:java}
Model m = RDFDataMgr.loadModel("src/bad_data_out.n3");
{code}
and not
{code:java}
FileInputStream fis = new FileInputStream(new File(src/"bad_data_out.n3"));
{code}
which is sensitive to the character set of the OS. If that is, say, ISO-8859-1, then the data will be corrupt because the file contains UTF-8 characters that encode in multi-byte sequences. The ORDER BY will be using binary in Java strings which is suspect.
If it still fails, could we have a smaller set of data that illustrates the problem?
> Sorting by labels in SPARQL query fail
> --------------------------------------
>
> Key: JENA-2333
> URL: https://issues.apache.org/jira/browse/JENA-2333
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ, Jena
> Affects Versions: Jena 2.10.1, Jena 3.16.0, Jena 4.5.0
> Reporter: Georgy Litvinov
> Priority: Major
> Attachments: SortingBug.java, bad_data_out.n3
>
>
> {color:#172b4d}Sorting by labels fail on this data set.{color}
> {color:#172b4d}Simple Java example to reproduce attached.{color}
> {color:#172b4d}Looks like a race condition involved.{color}
> {noformat}
> SELECT ?label WHERE {
> ?object <http://www.w3.org/2000/01/rdf-schema#label> ?label . } ORDER BY ASC(?label)
> {noformat}
>
> {noformat}
> java.lang.IllegalArgumentException: Comparison method violates its general contract!
> at java.base/java.util.TimSort.mergeLo(TimSort.java:781)
> at java.base/java.util.TimSort.mergeAt(TimSort.java:518)
> at java.base/java.util.TimSort.mergeCollapse(TimSort.java:448)
> at java.base/java.util.TimSort.sort(TimSort.java:245)
> at java.base/java.util.Arrays.sort(Arrays.java:1441)
> at org.apache.jena.atlas.data.AbortableComparator.abortableSort(AbortableComparator.java:57)
> at org.apache.jena.atlas.data.SortedDataBag.iterator(SortedDataBag.java:205)
> at org.apache.jena.atlas.data.SortedDataBag.iterator(SortedDataBag.java:192)
> at org.apache.jena.sparql.engine.iterator.QueryIterSort$SortedBindingIterator.initializeIterator(QueryIterSort.java:88)
> at org.apache.jena.atlas.iterator.IteratorDelayedInitialization.init(IteratorDelayedInitialization.java:38)
> at org.apache.jena.atlas.iterator.IteratorDelayedInitialization.hasNext(IteratorDelayedInitialization.java:48)
> at org.apache.jena.sparql.engine.iterator.QueryIterPlainWrapper.hasNextBinding(QueryIterPlainWrapper.java:59)
> at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
> at org.apache.jena.sparql.engine.iterator.QueryIterConvert.hasNextBinding(QueryIterConvert.java:58)
> at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
> at org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:38)
> at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
> at org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:38)
> at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
> at org.apache.jena.sparql.exec.RowSetStream.hasNext(RowSetStream.java:47)
> at org.apache.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:81)
> at test.SortingBug.isReproduced(SortingBug.java:53)
> at test.SortingBug.main(SortingBug.java:39)
> {noformat}
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