Spring @Value TypeMismatchException：无法将类型“java.lang.String”的值转换为所需类型“java.lang.D

解决Spring @Value TypeMismatchException：无法将类型“java.lang.String”的值转换为所需类型“java.lang.Double”

java
@Bean
public ConversionService conversionService() {
    DefaultConversionService conversionService = new DefaultConversionService();
    conversionService.addConverter(new StringToDoubleConverter());
    return conversionService;
}

java
public class StringToDoubleConverter implements Converter {
    @Override
    public Double convert(String source) {
        return Double.parseDouble(source);
    }
}

java
@Value("#{T(java.lang.Double).parseDouble('${config.value}')}")
private Double value;

java
@Configuration
public class AppConfig {
    @Value("#{T(java.lang.Double).parseDouble('${config.value}')}")
    private Double value;
    @Bean
    public ConversionService conversionService() {
        DefaultConversionService conversionService = new DefaultConversionService();
        conversionService.addConverter(new StringToDoubleConverter());
        return conversionService;
    }
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
        AppConfig appConfig = context.getBean(AppConfig.class);
        System.out.println(appConfig.value);
        context.close();
    }
}