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  1. Apache NiFi
  2. NIFI-5887

JOLTTransformJSON advanced window JSON format validation should accept EL without double quote



    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 1.7.0
    • Fix Version/s: None
    • Component/s: Extensions
    • Labels:


      JOLTTransformJSON advanced configuration window allows user to design a Jolt spec using NiFi EL. Also it does provide a feature to set FlowFile attributes to confirm conversion result for testing.

      However, the advanced window spec JSON format validation doesn't allow EL expression without double quote. Because of this, user can not try a JOLT spec using EL which references a FlowFile attribute having a valid JSON object. See details below.

      It would be more user friendly if the advanced window allows a Jolt spec even if it is not a valid JSON format. Probably adding a toggle switch to disable JSON validation might be a solution.

      i have a attribute (that produced by a REST service and catched by invokeHTTP processor) in JSON format like this:

      test => {"key":"value"}

      and then i want to put it in flows JSON content using JOLT processor, my content is something like this:

      { "id": 123, "user": "foo" }

      and my JOLT specification is this:

      [{ "operation": "default", "spec": { "interest": "${test}" } }]

      the problem is here that, in JOLT advanced window with test attribute nifi cannot put json object and shown this error:

      "Error occurred during transformation"

      and when run processor this detailed error is become alerted:

      "unable to unmarshal json to an object"

      my desired result is this:

      { "id": 123, "user": "foo", "interest": {"key":"value"} }

      is this a bug or am i wrong?


        1. NIFI-5887_JOLT_with_JSON_attribute_value.xml
          17 kB
          Koji Kawamura
        2. Screenshot (93).png
          26 kB



            • Assignee:
              mehrdad22 meh
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