Jackson YAML to POJO mapping

title: "my awesome conf"
childConfiguration:
  message: "hello world"

<dependency>
  <groupId>com.fasterxml.jackson.dataformat</groupId>
  <artifactId>jackson-dataformat-yaml</artifactId>
  <version>${jackson.version}</version>
</dependency>

public class RootConfiguration {

    private ChildConfiguration childConfiguration;
    
    private String title;

    public ChildConfiguration getChildConfiguration() {
        return childConfiguration;
    }

    public void setChildConfiguration(ChildConfiguration childConfiguration) {
        this.childConfiguration = childConfiguration;
    }
    
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @Override
    public String toString() {
        return "RootConfiguration{" +
                "childConfiguration=" + childConfiguration +
                '}';
    }
}

public class ChildConfiguration {

    private String message;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Override
    public String toString() {
        return "ChildConfiguration{" +
                "message=" + message +
                '}';
    }
}

public RootConfiguration getConfiguration() throws IOException {
    ObjectMapper yamlMapper = new ObjectMapper(new YAMLFactory());
    File configFile = new File("configuration.yml");
    Preconditions.checkArgument(configFile.exists(), "configuration file doesn't exist");
    return yamlMapper.readValue(configFile, RootConfiguration.class);
}

com.fasterxml.jackson.databind.exc.MismatchedInputException