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https://issues.apache.org/jira/browse/JENA-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15268473#comment-15268473
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ASF GitHub Bot commented on JENA-1172:
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Github user afs commented on the pull request:
https://github.com/apache/jena/pull/137#issuecomment-216488533
Looks good to me.
> blank nodes can break jena-text
> -------------------------------
>
> Key: JENA-1172
> URL: https://issues.apache.org/jira/browse/JENA-1172
> Project: Apache Jena
> Issue Type: Bug
> Components: Text
> Affects Versions: Jena 3.0.1
> Reporter: Osma Suominen
> Assignee: Osma Suominen
>
> Data with blank node subjects can break the jena-text index.
> For this example I use a typical jena-text configuration which indexes
> rdfs:label. Then I add this triple:
> {noformat}
> _:b0 <http://www.w3.org/2000/01/rdf-schema#label> "blank" .
> {noformat}
> There is no error (though I remember seeing WARNINGs in other situations like
> this) and the triple gets indexed.
> When I later execute this query:
> {noformat}
> PREFIX text: <http://jena.apache.org/text#>
> SELECT ?s { ?s text:query 'blank' }
> {noformat}
> I get this error:
> {noformat}
> 10:22:38 WARN [5] RC = 500 : java.lang.UnsupportedOperationException:
> 3ed87b7f14f612ef53788d889f6410d6 is not a URI node
> org.apache.jena.ext.com.google.common.util.concurrent.UncheckedExecutionException:
> java.lang.UnsupportedOperationException: 3ed87b7f14f612ef53788d889f6410d6 is
> not a URI node
> at
> org.apache.jena.ext.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2203)
> at
> org.apache.jena.ext.com.google.common.cache.LocalCache.get(LocalCache.java:3937)
> at
> org.apache.jena.ext.com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4739)
> at
> org.apache.jena.atlas.lib.cache.CacheGuava.getOrFill(CacheGuava.java:58)
> at org.apache.jena.query.text.TextQueryPF.query(TextQueryPF.java:291)
> at
> org.apache.jena.query.text.TextQueryPF.variableSubject(TextQueryPF.java:229)
> at org.apache.jena.query.text.TextQueryPF.exec(TextQueryPF.java:198)
> at
> org.apache.jena.sparql.pfunction.PropertyFunctionBase$RepeatApplyIteratorPF.nextStage(PropertyFunctionBase.java:106)
> {noformat}
> Note that this happens any time the jena-text query happens to match a blank
> node subject. So a single triple with a blank node subject can "taint" the
> whole index. This is what happens with LCSH, which for whatever reason
> happens to contain a few hundred blank nodes that have a skos:prefLabel
> property (among almost 8M triples that generally use URIs for everything).
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