How to register additional jackson module on the JacksonJsonLayout?

[rfoltyns]

How to register additional jackson module on the JacksonJsonLayout?

[rfoltyns]

At the moment there's no other way.

But I'm open to PRs if you'd like to add support for configurable modules. I can add a method to make this extension easier and pave the way for later improvements. Most probably sth like:

protected Builder configureModules(ObjectMapper)

called exactly where you suggested.

[haikal00]

This means to have list of jackson module being registered just like how Mixins is registered.
So user will include the module in the class path (maven pom dependency), and register that in the log4j2.xml?

[rfoltyns]

Yes, but rather more like virtual properties, not mixins. Mixins rely on loadClassand I'm not a fan on clazz.newInstance() here. Here, module instance should be ready to use once it's added to the builder via withJacksonModules(JacksonModule[]).

It's all about creating proper skeleton for this. JacksonModule interface maybe? JacksonModule.applyTo(ObjectMapper) should ensure enough flexibility and extensibility with following philosophy in mind:

Want to add a module? You have to provide an implementation on your own, but in exchange you can then customize the mapper any way you want

Few more thoughts:

• ExtendedLog4j2JsonModule can be migrated as-is - let's just make sure that it's added to the default list and never replaced(!), because it sets up mixins required for serialization. Mixins can be overriden later with JacksonMixIn, so having it set up like that is not an issue.

• JacksonAfterburnerModuleConfigurer may have to be migrated at some point as well (afterburner flag might be tricky though). AfterburnerModule class MUST be loaded ONLY if flag is set to true.

• only concern is the config order. I guess that this one should work for a start:

1. modules
2. mixins
3. virtual properties

[rfoltyns]

Custom module support will be released in 1.5.

[rfoltyns]

@haikal00 would you like to test the new functionality with a SNAPSHOT version to verify that it works as you expected?

[rfoltyns]

Released in 1.5.0.

Enjoy!