Bug? JSON parsing fails when string value ends with a forward slash '/'

[RogierLangeveld]

When in the JSON source file I have data similar to this:

{
  "Test_field_1": null,
  "Test_field_2": 1001,
  "Test_field_3": "text3",
  "Test_field_4": "text4/",
  "Test_field_5": true
}

RML Mapper will fail on Test_field_4 with a message like:

16:49:17.888 [main] ERROR be.ugent.rml.cli.Main               .run(287) - Unable to parse mapping rules as Turtle. Does the file exist and is it valid Turtle?
org.eclipse.rdf4j.rio.RDFParseException: Not a valid (absolute) IRI: /text4/ [line 999]
        at org.eclipse.rdf4j.rio.helpers.RDFParserHelper.reportFatalError(RDFParserHelper.java:380)
        at org.eclipse.rdf4j.rio.helpers.AbstractRDFParser.reportFatalError(AbstractRDFParser.java:723)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.reportFatalError(TurtleParser.java:1317)
        at org.eclipse.rdf4j.rio.helpers.AbstractRDFParser.createURI(AbstractRDFParser.java:360)
        at org.eclipse.rdf4j.rio.helpers.AbstractRDFParser.resolveURI(AbstractRDFParser.java:338)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.parseURI(TurtleParser.java:944)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.parsePrefixID(TurtleParser.java:284)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.parseDirective(TurtleParser.java:214)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.parseStatement(TurtleParser.java:195)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.parse(TurtleParser.java:165)
        at org.eclipse.rdf4j.rio.turtle.TurtleParser.parse(TurtleParser.java:128)
        at be.ugent.rml.store.RDF4JStore.read(RDF4JStore.java:145)
        at be.ugent.rml.cli.Main.run(Main.java:284)
        at be.ugent.rml.cli.Main.main(Main.java:49)
Caused by: java.lang.IllegalArgumentException: Not a valid (absolute) IRI: /text4/
        at org.eclipse.rdf4j.model.impl.SimpleIRI.setIRIString(SimpleIRI.java:96)
        at org.eclipse.rdf4j.model.impl.SimpleIRI.<init>(SimpleIRI.java:67)
        at org.eclipse.rdf4j.model.impl.SimpleValueFactory.createIRI(SimpleValueFactory.java:83)
        at org.eclipse.rdf4j.rio.helpers.RDFStarDecodingValueFactory.createIRI(RDFStarDecodingValueFactory.java:46)
        at org.eclipse.rdf4j.rio.helpers.AbstractRDFParser.createURI(AbstractRDFParser.java:358)
        ... 10 common frames omitted
java.lang.IllegalArgumentException: Unable to parse mapping rules as Turtle. Does the file exist and is it valid Turtle?
Finished.

I am processing hundreds of JSON files with hundred JSON objects each. It appears to only fail on JSON objects with string values that ends with /...

I seems not even to start processing the data, but seems to already fail on parsing the JSON file. (I use a custom function that should handle the string value, that works fine on all other thousands of objects, but seems not to even be called when the value ends with a slash. Because also if I edit another field to end with a slash, the RML Mapper will fail the same way.)

This seems to me to be a bug in de JSON parser of RML Mapper.

[RogierLangeveld]

Just a thought: possibly the json parser mixes up \ and / as escape character, and incorrectly assumes /" is an escaped double-quote?