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https://issues.apache.org/jira/browse/JENA-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059862#comment-15059862
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Andy Seaborne commented on JENA-1094:
-------------------------------------
It looks like it is not text query related directly - text queries happen to
trigger the pattern but so will other forms.
TDB causes the exception because it materializes binding (mapping internal ids
to nodes) where it does checking as it flattens trees of bindings. It's the
tree of bindings that's wrong, not TDB materialization.
It will happen in other places though I think it's only going to rebinding the
same value to the duplicated variable so it is harmless but wrong.
> "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
> Assignee: Andy Seaborne
>
> 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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