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https://issues.apache.org/jira/browse/JENA-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555629#comment-17555629
]
Georgy Litvinov commented on JENA-2333:
---------------------------------------
I reproduced that on Debian and Centos, I believe it was also reproduced on
MacOS.
Please, try this. My results are 437 of 1000
public static void main(String[] args) throws FileNotFoundException {
int counter = 0;
for (int i=0;i<1000; i++) {
Model m = RDFDataMgr.loadModel("src/bad_data_out.n3");
boolean result = isReproduced(queryStr, m);
if (result) {
counter++;
}
}
System.out.println("finished " + counter);
}
private static boolean isReproduced(String queryStr, Model m) {
boolean result = true;
QueryExecution qe = QueryExecutionFactory.create(queryStr, m);
try {
ResultSet rs = qe.execSelect();
if(rs.hasNext()) {
result = false;
}
} catch (Exception e) {
}
finally {
qe.close();
}
return result;
}
> 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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