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)
