Exception is thrown when JSONPath encounters null

[mielvds]

When a JSONPath encounters a null value, the mapper crashes.

16:40:47.846 [main] DEBUG b.u.rml.records.JSONRecordFactory   .getRecords(40) - No document found for data.json. Creating new one
16:40:47.870 [main] DEBUG c.j.j.internal.path.CompiledPath    .evaluate(47) - Evaluating path: $[*]
16:40:47.876 [main] DEBUG c.j.j.internal.path.CompiledPath    .evaluate(47) - Evaluating path: $[0]['custom_fields'][?]['value']
16:40:47.877 [main] DEBUG c.j.j.internal.path.CompiledPath    .evaluate(47) - Evaluating path: @['label']
16:40:47.882 [main] DEBUG c.j.j.internal.path.CompiledPath    .evaluate(47) - Evaluating path: $[0]['name']
16:40:47.883 [main] DEBUG c.j.j.internal.path.CompiledPath    .evaluate(47) - Evaluating path: $[1]['custom_fields'][?]['value']
16:40:47.883 [main] DEBUG c.j.j.internal.path.CompiledPath    .evaluate(47) - Evaluating path: @['label']
16:40:47.883 [main] ERROR be.ugent.rml.cli.Main               .main(312) - null

Example to reproduce:

[
  {
    "id": "001",
    "name": "x",
    "custom_fields": [
      {
        "value": "OR-12345",
        "label": "OR-ID"
      }
    ]
  },
  {
    "id": "002",
    "name": "y",
    "custom_fields": [
      {
        "value": null,
        "label": "OR-ID"
      }
    ]
  },
  {
    "id": "003",
    "name": "z",
    "custom_fields": [
      {
        "value": "OR-1011",
        "label": "OR-ID"
      }
    ]
  }
]

@prefix rr:         <http://www.w3.org/ns/r2rml#> .
@prefix foaf:       <http://xmlns.com/foaf/0.1/> .
@prefix ex:         <http://example.com/> .
@prefix xsd:        <http://www.w3.org/2001/XMLSchema#> .
@prefix rml:        <http://semweb.mmlab.be/ns/rml#> .
@prefix ql:         <http://semweb.mmlab.be/ns/ql#> .
@prefix org:        <http://www.w3.org/ns/org#> .
@prefix skos:       <http://www.w3.org/2004/02/skos/core#> .
@prefix dc:         <http://purl.org/dc/terms/> .
@base               <http://example.org/tm/> .

<json>
  a rr:TriplesMap;

  rml:logicalSource [
    rml:source "data.json";
    rml:referenceFormulation ql:JSONPath;
    rml:iterator "$[*]"
  ];
  rr:subjectMap [
    rr:template "http://example.org/{custom_fields[?(@.label=='OR-ID')].value}";
    rr:class org:Organization
  ]; 
  rr:predicateObjectMap [ 
    rr:predicate skos:altLabel; 
    rr:objectMap [ rml:reference "name"; rr:language "nl" ]
  ].

[DylanVanAssche]

Hi @mielvds !

Thanks for your detailed report! We can reproduce the issue and we're working on a fix.

[pheyvaer]

@mielvds This should be fixed in the latest release (v4.9.4). Can you check if it works for you too?

[no-response[bot]]

This issue has been automatically closed because there has been no response to our request for more information from the original author. With only the information that is currently in the issue, we don't have enough information to take action. Please reach out if you have or find the answers we need so that we can investigate further.

[mielvds]

yes fixed!