SpringMVC 自定义日期时间转换器时报错：Unable to determine source type ＜S＞ and target type ＜T＞ for your Converter

错误

解决方案

@Configuration
public class DateConverterConfig {

    @Bean
    @ConditionalOnBean(name = "requestMappingHandlerAdapter") //不加该行代码报错：Unable to determine source type  and target type  for your Converter [com.wego.config.DateConverterConfig$$Lambda$828/0x00000007c08f57b0]; does the class parameterize those types?
    public Converter localDateTimeConverter() {
        return source -> LocalDateTime.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    }

    @Bean
    public Converter localDateConverter() {
        return new Converter() {
            @Override
            public LocalDate convert(String source) {
                return LocalDate.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd"));
            }
        };
    }
}

说明：采用传统方式书写时不会报错，但优化代码为lambda时就报错了，解决方案，只需要在方法上面添加注解@ConditionalOnBean(name = "requestMappingHandlerAdapter")就可以了