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This patch release delivers fixes for configuration inconsistencies and formatting issues across several layouts.

  • Restores alignment between documented and actual configuration attributes.
  • Fixes formatting and sanitization issues in XML and RFC5424 layouts.
  • Improves handling of invalid characters and non-standard values.

The authoritative list of recognized configuration attributes is available in the PluginReference.

Fixed

  • Don't issue warnings if extra argument in parameterized logging is null. (#3975, [#4014])
  • Restore support for documented Rfc5424Layout parameter names. (#4022, [#4074])
  • Take Throwable#toString() into account while rendering stack traces in Pattern Layout. (#3623, [#4033])
  • Added debug level logs for successful resource loading in Loader class. (#4058, [#4060])
  • Align SslConfiguration factory method usage with Log4j 2.12+ API. The verifyHostname attribute is now correctly recognized. (#4061, [#4075])
  • Fix sanitization of structured data parameter names in RFC5424 layout. (#4073)
  • Replace invalid characters in XmlLayout output with the Unicode replacement character (U+FFFD). (#4077)
  • Replace invalid characters in Log4j1XmlLayout output with the Unicode replacement character (U+FFFD). (#4078)
  • Replace invalid characters in MapMessage.asXml() output with the Unicode replacement character (U+FFFD). (#4079)
  • Write non-finite floating-point numbers as strings in JsonWriter. (#4080)
Source: README.md, updated 2026-03-28