Osma Suominen created JENA-1094:
-----------------------------------
Summary: "Attempt to reassign ?graph" when using text:query with
VALUES ?graph
Key: JENA-1094
URL: https://issues.apache.org/jira/browse/JENA-1094
Project: Apache Jena
Issue Type: Bug
Affects Versions: Jena 3.0.1
Reporter: Osma Suominen
A strange problem involving jena-text, GRAPH and VALUES that I noticed as the
3.0.1 release was being prepared.
To reproduce:
1. Start Fuseki 1.3.1 with the included jena-text example configuration:
{noformat}
./fuseki-server --config config-tdb-text.ttl
{noformat}
2. Insert example data:
{noformat}
PREFIX ex: <http://example.com/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
INSERT DATA {
GRAPH ex: {
ex:s rdfs:label "Example" .
}
}
{noformat}
3. Perform this query:
{noformat}
PREFIX ex: <http://example.com/>
PREFIX text: <http://jena.apache.org/text#>
SELECT *
WHERE {
GRAPH ?graph {
?s text:query 'example' .
}
}
VALUES ?graph { ex: }
{noformat}
Result:
{noformat}
16:26:37 WARN [2] RC = 500 : Attempt to reassign '?graph' from
'<http://example.com/>' to '<http://example.com/>'
org.apache.jena.sparql.ARQInternalErrorException: Attempt to reassign '?graph'
from '<http://example.com/>' to '<http://example.com/>'
at
org.apache.jena.sparql.engine.binding.BindingHashMap.checkAdd(BindingHashMap.java:112)
at
org.apache.jena.sparql.engine.binding.BindingHashMap.add(BindingHashMap.java:91)
at
org.apache.jena.sparql.engine.binding.BindingFactory.materialize(BindingFactory.java:60)
at
org.apache.jena.tdb.solver.QueryEngineTDB$QueryIteratorMaterializeBinding.moveToNextBinding(QueryEngineTDB.java:131)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.nextBinding(QueryIteratorBase.java:153)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.moveToNextBinding(QueryIteratorWrapper.java:42)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.nextBinding(QueryIteratorBase.java:153)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.next(QueryIteratorBase.java:128)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.next(QueryIteratorBase.java:40)
at
org.apache.jena.sparql.engine.ResultSetStream.nextBinding(ResultSetStream.java:86)
at
org.apache.jena.sparql.engine.ResultSetCheckCondition.nextBinding(ResultSetCheckCondition.java:83)
at
org.apache.jena.sparql.resultset.ResultSetMem.<init>(ResultSetMem.java:87)
at
org.apache.jena.query.ResultSetFactory.makeRewindable(ResultSetFactory.java:404)
at
org.apache.jena.sparql.resultset.TextOutput.write(TextOutput.java:145)
at
org.apache.jena.sparql.resultset.TextOutput.write(TextOutput.java:130)
at
org.apache.jena.sparql.resultset.TextOutput.write(TextOutput.java:118)
at
org.apache.jena.sparql.resultset.TextOutput.format(TextOutput.java:66)
at
org.apache.jena.query.ResultSetFormatter.out(ResultSetFormatter.java:157)
at
org.apache.jena.fuseki.servlets.ResponseResultSet$3.output(ResponseResultSet.java:242)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.output(ResponseResultSet.java:301)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.textOutput(ResponseResultSet.java:248)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.doResponseResultSet$(ResponseResultSet.java:147)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.doResponseResultSet(ResponseResultSet.java:88)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.sendResults(SPARQL_Query.java:364)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.execute(SPARQL_Query.java:254)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.executeWithParameter(SPARQL_Query.java:205)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.perform(SPARQL_Query.java:81)
at
org.apache.jena.fuseki.servlets.SPARQL_ServletBase.executeLifecycle(SPARQL_ServletBase.java:227)
at
org.apache.jena.fuseki.servlets.SPARQL_ServletBase.executeAction(SPARQL_ServletBase.java:204)
at
org.apache.jena.fuseki.servlets.SPARQL_ServletBase.execCommonWorker(SPARQL_ServletBase.java:186)
at
org.apache.jena.fuseki.servlets.SPARQL_ServletBase.doCommon(SPARQL_ServletBase.java:79)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.doGet(SPARQL_Query.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
at
org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:82)
at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:294)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
at
org.eclipse.jetty.server.nio.BlockingChannelConnector$BlockingChannelEndPoint.run(BlockingChannelConnector.java:298)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:745)
{noformat}
Already present in Jena 3.0.0.
If I change the query to avoid the VALUES block (i.e. GRAPH ex: { ... }) then
it will no longer break.
Moving the VALUES block inside the WHERE block doesn't help.
I haven't seen this happen in any of my real world queries, even though they
have the same elements as this one.
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