There aren't any results because
1:: --data puts the contents of ex002.ttl into the default graph.
2:: FROM <ex002.ttl> picks the named graph (resolved <ex002.ttl>) from
the underlying database ... which isn't there so it's empty.
No results.
If you use
--namedgraph ex002.ttl
or remove the FROM
it works.
This was a change to make all the datasets behave the same way.
Andy
On 30/11/2019 18:00, Bob DuCharme wrote:
An example in my book "Learning SPARQL" suggests the following command
line with the query at
http://learningsparql.com/2ndeditionexamples/ex007.rq :
arq --query ex007.rq
This worked fine as shown with Jena 3.10.0 build date
2018-12-30T15:45:57+0000 but got the Exception shown below with 3.13.1
build date 2019-10-06T18:57:39+0000. When I add --data ex002.ttl to
that command line, I don't get the Exception, but it doesn't return
any results either.
Thanks,
Bob
java.lang.NullPointerException
at
org.apache.jena.query.QueryExecutionFactory.make(QueryExecutionFactory.java:615)
at
org.apache.jena.query.QueryExecutionFactory.create(QueryExecutionFactory.java:94)
at arq.query.lambda$queryExec$0(query.java:224)
at org.apache.jena.system.Txn.exec(Txn.java:77)
at org.apache.jena.system.Txn.executeRead(Txn.java:115)
at arq.query.queryExec(query.java:222)
at arq.query.exec(query.java:153)
at jena.cmd.CmdMain.mainMethod(CmdMain.java:93)
at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
at arq.arq.main(arq.java:28)
