Handling multi-line log messages

[metacubed]

When configuring handling of newlines in log messages, a useful addition would be the ability to output the "message" field as a JSON array, instead of a JSON string.

For example, with either of these logging statements:

logger.error("first line{}second line", System.lineSeparator());
// or
logger.error("first line\nsecond line");
// or
logger.error("first line\r\nsecond line");

The output would be consistent:

{
    "message": [
        "first line",
        "second line"
    ],
    ...
}

This would provide an unambiguous parsing format on the target system instead of relying on the source platform's newline representation.

[philsttr]

While this is not directly supported by the existing JsonProviders, you could disable the output of the current message field, and implement this functionality in a custom JsonProvider

Alternatively, would you be interested in submitting a PR for modifying the existing MessageJsonProvider to support this? You could modify the MessageJsonProvider to have an option to split the message on newlines.

[metacubed]

@philsttr, thanks for pointing me to the right class. I'll try adding a new option to the MessageJsonProvider.

[metacubed]

@philsttr, are you ok with adding the JUnitParams library to this project? It uses the same license, Apache 2.0 - 2004.

It is also recommended by JUnit: Parameterized tests - See also

[philsttr]

I'd rather not, since I don't see much activity on that project, and the last release was close to 3 years ago.

[metacubed]

@philsttr, no worries, I haven't used it.

I just submitted a PR #413 to add the multi-line splitting option - please review when convenient.