How to set default value for Map in spring @Value?

I am having below property in properties file

test.feature={UPPER:{id:'54'}}

Below is the bean I am tying to get the value from properties file.

    @Bean
    public Map<String, Map<String, String>> test(
        @Value("#{${test.feature}}")
        Map<String, Map<String, String>> ids) {

        return ids;
    }

It's working fine. But if we not configure the property, want to set the default value.

I tried in different ways but nothing helps.

@Value("#{${test.feature:{T(java.util.Collections).emptyMap()}}}")
getting IllegalStateException: Cannot convert value of type 'java.util.ArrayList' to required type 'java.util.Map': no matching editors or conversion strategy found. 

@Value("#{${test.feature} ?: { : }}")

@Value("#{${test.feature:}}")

I have tried above ways but nothing helps.

Note: I'm using spring 5.x and not in spring boot.

How to fix this?

If the map is not empty, it can be written as follows:

@Value("#{${populate.map:{'k1':'v1','k2':'v2'}}}")  // result is {"k1":"v1","k2":"v2"}
private Map<String, String> map3;

or:

@Value("#{${test.feature:{k1:{nk1:'v1'}}}}") Map<String,Map<String,String>> map

otherwise:

@Value("#{${test.feature:{T(java.util.Collections).emptyMap()}}}") Map<String, String> map3

1. This is how you can define map in .properties file

myMap.key1 = value1

myMap.key2 = value2

myMap.key3 = value3

2. And how to deal with nested map:

nestedMap.key1.nestedKey1=nestedValue1

nestedMap.key1.nestedKey2=nestedValue2

nestedMap.key2.nestedKey3=nestedValue3

nestedMap.key2.nestedKey4=nestedValue4

I have tested and this works as you wanted it:

@Value("#{${test.feature:{T(java.util.Collections).emptyMap()}}}")
Map<String, Map<String, String>> ids) {
return ids;