[jira] [Created] (JENA-1172) blank nodes can break jena-text

["Osma Suominen (JIRA)" <ji...@apache.org>]

Osma Suominen created JENA-1172:
-----------------------------------

             Summary: 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: Fuseki 2.3.1
            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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