My project uses the 3.3.2 version of Spring

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.3.2</version>
        <relativePath/>
    </parent>
    ...
    <dependencies>
        ...
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        ...
    <dependencies>

I have defined a configuration for myself with the Currency field and use the java.util.Currency type:

import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.context.properties.ConfigurationProperties;

import java.util.Currency;

@Getter
@Setter
@ConfigurationProperties(prefix = "my-config")
public class ConfigProperties {
    private Currency currency;
}

I have set @EnableConfigurationProperties(ConfigProperties.class) in the configuration.
Next, I set the following value in application.yml:

my-config:
  currency: 840

For correct conversion, I wrote the following class:

import jakarta.annotation.Nonnull;
import org.springframework.boot.context.properties.ConfigurationPropertiesBinding;
import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;

import java.util.Currency;

@Component
@ConfigurationPropertiesBinding
public class IntegerToCurrencyConverter implements Converter<Integer, Currency> {

    @Override
    public Currency convert(@Nonnull Integer source) {
        return Currency.getInstance(String.valueOf(source));
    }
}

But I still get the error:

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to bind properties under 'my-config.currency' to java.util.Currency:

    Property: my-config.currency
    Value: "840"
    Origin: class path resource [application.yaml] - 33:13
    Reason: failed to convert java.lang.Integer to java.util.Currency (caused by java.lang.IllegalArgumentException)

Action:

Update your application's configuration

I did it according to the tutorial https://www.baeldung.com/configuration-properties-in-spring-boot

I found a similar issue on GitHub, but it was closed.