How to write a Deserializer which only works for List<String>, but not for other Lists?

I want to write a Deserializer which removes blank strings from arrays. I am not sure why, but my Deserializer is never called. (I don’t see the Hello World in the console). Additionally, the array with the blank string is written to the database with the blank strings. So, Jackson just skips my Deserializer for any reason. My other Deserializers work without a problem. I am not sure if this is a bug or if I forgot something in my code. Thanks in advance.

Version information Spring Boot 2.5.4 Jackson 2.12.4

To Reproduce ArrayTrimDeserializer.java

public class ArrayTrimDeserializer extends StdDeserializer<String[]> {

    protected ArrayTrimDeserializer() {
        super(String[].class);
    }

    @Override
    public String[] deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        System.out.println("Hello World!");

        JsonNode array = deserializationContext.readTree(jsonParser);
        List<String> filtered = new ArrayList<>();

        for(JsonNode node : array){
            String str = node.textValue();
            if(!str.isBlank()){
                filtered.add(str);
            }
        }

        return filtered.toArray(new String[0]);
    }
}

RegisterModule.java

@Component
public class RegisterModule extends SimpleModule {

    public RegisterModule() {
        // ...
        addDeserializer(String[].class, new ArrayTrimDeserializer());
    }
}

[cowtowncoder]

Excellent @Alwinator, thank you for sharing the solution!

[Alwinator]

@cowtowncoder Thanks! That was exactly the hint I needed. I have implemented the solution here: https://github.com/Alwinator/StringListJsonTrimmer