Comments (2)
DylanVanAssche
commented on September 3, 2024
It seems that your SubjectMap is not correct. You must use rr:BlankNode as rr:termType's object:
rr:subjectMap [
rr:column "Column_Name";
rr:termType rr:BlankNode;
rr:class giam:Entitlement
]
from rmlmapper-java.
jaxley
commented on September 3, 2024
Okay, I'm getting the same null pointer exception error.
I did some experimenting and it's being caused by attempting to add an rdf:comment that's an empty string
Use sample data file stuff.json:
{
"stuff": [
{"id":"12345", "value":"hi"}
]
}This will cause an exception:
17:09:30.580 [main] DEBUG b.u.rml.records.JSONRecordFactory .getRecords(40) - No document found for stuff.json. Creating new one
17:09:30.597 [main] DEBUG c.j.j.internal.path.CompiledPath .evaluate(93) - Evaluating path: $['stuff'][*]
17:09:30.600 [main] DEBUG c.j.j.internal.path.CompiledPath .evaluate(93) - Evaluating path: $['stuff'][0]['id']
17:09:30.601 [main] ERROR be.ugent.rml.cli.Main .run(420) - Cannot invoke "be.ugent.rml.functions.SingleRecordFunctionExecutor.execute(be.ugent.rml.records.Record)" because "this.functionExecutor" is null
17:09:30.601 [main] ERROR be.ugent.rml.cli.Main .run(457) - Cannot invoke "be.ugent.rml.functions.SingleRecordFunctionExecutor.execute(be.ugent.rml.records.Record)" because "this.functionExecutor" is null
java.lang.NullPointerException: Cannot invoke "be.ugent.rml.functions.SingleRecordFunctionExecutor.execute(be.ugent.rml.records.Record)" because "this.functionExecutor" is null
at be.ugent.rml.termgenerator.LiteralGenerator.generate(LiteralGenerator.java:47)
at be.ugent.rml.Executor.generatePredicateObjectGraphs(Executor.java:345)
at be.ugent.rml.Executor.executeWithFunction(Executor.java:178)
at be.ugent.rml.Executor.execute(Executor.java:132)
at be.ugent.rml.cli.Main.run(Main.java:416)
at be.ugent.rml.cli.Main.main(Main.java:49)
---
base: http://www.semanticweb.org/Broken#
prefixes:
instance: http://www.semanticweb.org/Broken#
rdfs: http://www.w3.org/2000/01/rdf-schema#
idlab-fn: http://example.com/idlab/function/
grel: http://users.ugent.be/~bjdmeest/function/grel.ttl#
sources:
stuff:
access: stuff.json
referenceFormulation: jsonpath
iterator: "$.stuff[*]"
mappings:
threats:
sources: stuff
subjects: instance:$(id)
predicateobjects:
- [rdf:comment, ""]But, this will process just fine. Only difference is a single character.
---
base: http://www.semanticweb.org/Broken#
prefixes:
instance: http://www.semanticweb.org/Broken#
rdfs: http://www.w3.org/2000/01/rdf-schema#
idlab-fn: http://example.com/idlab/function/
grel: http://users.ugent.be/~bjdmeest/function/grel.ttl#
sources:
stuff:
access: stuff.json
referenceFormulation: jsonpath
iterator: "$.stuff[*]"
mappings:
threats:
sources: stuff
subjects: instance:$(id)
predicateobjects:
- [rdf:comment, " "]from rmlmapper-java.
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