How to use Log4j2 Spring Profile Arbiter in YAML configuration? - spring-boot

Question

I'm trying to get the Spring Profile Arbiter working. According to the documentation you can place an arbiter almost anywhere:
So an Arbiter could encapsulate something as simple as a single property declaration or a whole set of Appenders or Loggers.
Unfortunately, the documentation doesn't provide any example code how this can be done in modern yaml-config files. This is what I have at the moment:
Configuration:
name: Default
//...
Properties:
Property:
- name: log-dir
value: "./logs"
- name: log-file-name
value: "logfile"
- name: log-file-ext
value: "log"
- name: connection-factory-method
value: "getDbConnection"
SpringProfile:
name: development
- name: connection-factory-method
value: "getDbConnection4dev"
- name: con-pattern-logger
value: "%-50.50c{1.}"
//...
Sadly, not working as expected. Played for a while, but couldn't find a working solution. All I get are initialization errors.
I am grateful for any information that could help me get ahead.

Answer 1

In your configuration each YAML object represents a Log4j2 component.
The type of object (short plugin name) to instantiate must be provided as type property of the YAML object. If no such property exist, the key associated to the object is used.
To define a SpringProfileArbiter component that contains a Property component you can either use:
key1:
type: SpringProfile
name: development
property1:
type: Property
name: connection-factory-method
value: "getDbConnection4dev"
or
SpringProfile:
name: development
Property:
name: connection-factory-method
value: "getDbConnection4dev"
You can use arrays if you want to define multiple components of the same type.
Remark: if your application runs under the "development" profile, the "connection-factory-method" property will be defined twice. To prevent this you can use SelectArbiter and DefaultArbiter to provide the equivalent of an if ... else clause:
Select:
SpringProfile:
name: development
Property:
name: connection-factory-method
value: "getDbConnection4dev"
DefaultArbiter:
Property:
name: connection-factory-method
value: "getDbConnection"