How do I register a StatusListener in configuration?

[voddan]

Hi,
Documentation on StatusLogger mentions that I can create a custom StatusListener and register it.

How do I do that?
I could not find a cmd parameter or a configuration that would do that. The example in the documentation is in Java, but I don't understand where I would even put that code

I have a Spring 5 Java application, with Tomcat, developed on Windows. We use log4j.xml and command line parameters, for example -Dlog4j2.debug, to configure logging.

Changing the code of the app is out of the question, but I could add a separate Maven module if I have to build a plugin or something of this nature.

[vy]

This is explained in the Status Logger documentation. You need to programmatically do it. This is also stated in the JavaDoc you linked:

You can programmatically register listeners using registerListener(StatusListener)

[voddan]

@vy How would it look in a project? If you can share an example project where you do it like that, it would be great.

Simply put, I don't understand where I should put this line of code statusLogger.registerListener(StatusListener), considering that I can't put it into the code of the app.

[vy]

StatusLogger.getLogger().registerListener(...)

You need to place this snippet as early as possible in your application initialization, e.g.,

static {
    StatusLogger.getLogger().registerListener(...)
}

public static void main(String[] args) { ... }

[ppkarwasz]

We could probably register status listeners automatically using ServiceLoader, which is in practice the only way to ensure that they are registered before StatusLogger is used for the first time. The behavior could be similar to a JUnit LauncherSessionListener.

Of course for security reasons, there should also be a configuration property to turn on the auto-registration. Personally, I am open to a PR in this direction.