Hi Alexander,
the first argument on the left hand side must either be a query (e.g.
instance of sp:Select) or a template *call*. It is not supported to
simply use the URI of the template itself. If you only have a template,
you need to make the extra "hop" such as in
|
SELECT *
WHERE {
test:Select1 spin:body ?query .
(?query "arg1" owl:Thing_1) spin:select (?c ?l) .
}
|
Alternative, create an *instance* of test:Select1 such as test:MySelect1
and call it using
(test:MySelect1 "arg1" owl:Thing_1) spin:select (?c ?l)
I will improve the error handling to make clearer what is expected.
HTH
Holger
On 10/1/2014 20:44, Alexander Hoem Rosbach wrote:
Hi,
I am experimenting with the new features in 4.5, specifically the
built-in magic property *spin:select*. When I call a simple select
template from the sparql interface in TBC I get a nullpointer exception.
I have the following spin select template:
|
test:Select1 a spin:SelectTemplate;
rdfs:subClassOf spin:SelectTemplates;
spin:body [a sp:Select;
sp:resultVariables ([sp:varName
"c"^^xsd:string][sp:varName
"l"^^xsd:string]);
sp:where([sp:object[sp:varName
"c"^^xsd:string];
sp:predicate
rdfs:comment ;
sp:subject
spin:_arg1
][sp:object[sp:varName "l"^^xsd:string];
sp:predicate rdfs:label ;
sp:subject spin:_arg1
])
];
spin:constraint [a spl:Argument;
spl:predicate sp:arg1 ;
spl:valueType rdfs:Resource
].
|
And I have defined the following instance:
|
owl:Thing_1 a owl:Thing ;
rdfs:comment "Dette er en kommentar"^^xsd:string ;
rdfs:label "Dette er en label"^^xsd:string .
|
Then I've tried these queries:
|
SELECT *
WHERE {
(test:Select1 "arg1" owl:Thing_1) spin:select (?c ?l) .
}
|
|
SELECT *
WHERE {
(test:Select1) spin:select (?c ?l) .
}
|
My goal is to create a select template that can be called both with
bound and unbound arguments, for different use cases. But both of the
above queries result in NullPointerException.
Here is the error message:
eclipse.buildId=unknown
java.version=1.7.0_65
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments: -data
/home/ahr/Development/tbc.workspaces/epim-elh-4.5 -os linux -ws
gtk -arch x86_64
Error
Wed Oct 01 12:43:16 CEST 2014
Failed to retrieve all query results
java.lang.NullPointerException
at
org.topbraid.spin.arq.ARQFactory.createCommandString(ARQFactory.java:125)
at org.topbraid.spin.arq.ARQFactory.createQuery(ARQFactory.java:229)
at
org.topbraid.spin.arq.functions.SelectPFunction.exec(SelectPFunction.java:81)
at
com.hp.hpl.jena.sparql.pfunction.PropertyFunctionBase$RepeatApplyIteratorPF.nextStage(PropertyFunctionBase.java:108)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:115)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:67)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIterProcedure.hasNextBinding(QueryIterProcedure.java:74)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40)
at
com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at
com.hp.hpl.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:75)
at
org.topbraidcomposer.sparql.view.SPARQLView$9.handleResultSet(SPARQLView.java:413)
at
org.topbraidcomposer.sparql.view.SPARQLView$11.runSelectOrDescribe(SPARQLView.java:512)
at
org.topbraidcomposer.sparql.view.SPARQLView$11.run(SPARQLView.java:481)
at
org.topbraidcomposer.core.util.ThreadUtil$1$1.run(ThreadUtil.java:64)
at java.lang.Thread.run(Thread.java:745)
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