NIFI-15716 Added JSON Lines Support to ValidateJson.

[dan-s1]

Summary

NIFI-15716
The following PR introduces support for JSON Lines or NDJSON in the ValidateJson processor. The initial approach is to validate each object and fail fast on the first object which is invalid. The emitted warning message indicates which line has the invalid JSON object. I would like clarification if the line number should also be added to the FlowFile attribute json.validation.errors that is added to hold the validation error messages.
In addition to aforementioned feature, Intellij warnings were fixed and in one unit test the use of Jupitor Arguments.argumentSet replaced the use of Arguments.arguments

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  • JDK 21
  • JDK 25

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[exceptionfactory]

Thanks for adding this support in ValidateJson @dan-s1. I think it would be helpful to include the line number in the FlowFile attribute, in answer to your question. I noted a handful of recommended adjustments.