[LOG4J2-3080] Messages logged inconsistently when using JsonTemplateLayout.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.14.1
• Fix Version/s: 3.0.0, 2.15.0
• Component/s: JsonTemplateLayout
• Assignee: Volkan Yazici
• Reporter: Schubert Fernandes
• Created: 21/Apr/21 13:43
• Updated: 07/Mar/22 14:04
• Resolved: 07/Jun/21 09:25

Description

When using the JsonTemplateLayout and configuring the message with a fallbackKey...

  "message": {
    "$resolver": "message",
    "fallbackKey": "asString"
  }

the fallbackKey is not consistently used.
When logging via org.apache.log4j.Category.info(Object) the message string is logged directly without using the property defined in fallbackKey, e.g.

{"timestamp":"2021-04-21T14:25:27.625+01:00","loggerName":"explore.log4j.json.template.layout.Main","level":"INFO","message":"Message logged using org.apache.log4j.Category.info(Object)"}

but when logging using org.apache.logging.log4j.Logger.info(String) the message is correctly logged in the asString property as required, i.e.

{"timestamp":"2021-04-21T14:25:27.628+01:00","loggerName":"explore.log4j.json.template.layout.Main","level":"INFO","message":{"asString":"Message logged using org.apache.logging.log4j.Logger.info(String)"}}

Sample Maven project attached to reproduce.

Issue Links

• links to: GitHub Pull Request #504