Initializing Map from application.propeties in SpringBoot-CodePudding

I want to initialize a class field by using Spring's @Value Annotation.

The class field has the type Map<String, List<String>>.

I have tried using Spring's Expression Language, but I must be doing something wrong because it throws the following error, while loading the Spring Application Context:

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'myConfig': 
Unsatisfied dependency expressed through field 'iWantToBeInitialized'; 
nested exception is org.springframework.beans.factory.BeanExpressionException: 
Expression parsing failed; nested exception is org.springframework.expression.spel.SpelParseException: 
EL1041E: After parsing a valid expression, there is still more data in the expression: 'a'

This is the code for MyConfig.java:

@Configuration
public class MyConfig {

    @Value("#{'${foo.bar.mymap}'}")
    Map<String, List<String>> iWantToBeInitialized;
    
}

This is the code for application.properties:

foo.bar.mymap=${baz.bub.other:{'a-key':{'a-value'},'b-key':{'b1-value','b2-value'},'c-key':{'c1-value'}}}

It looks like it begins parsing the a of the a-key, but it isn't able to figure out to parse a map from it.

I have tried searching and stumbeld over a couple of Spring mechanisms including defining a "Custom Property Something", but I could not figure out how to extrapolate the solution of those examples on to my specific usecase.

Can someone point me into the right direction?

Update 1:

I have tried to apply

CodePudding user response：

follow code code snippet

@Component
@ConfigurationProperties(prefix = "xxx")
public class MyConfig {

   private Map<String, List<String>> iWantToBeInitialized;
    
}

application.yml
==================

xxx:
  iWantToBeInitialized:
    a-key:
      - a-value
    b-key:
      - b1-value
      - b2-value