问题

springboot2项目启动时报Failed to bind properties under 'oss.buy-deadline' to java.util.Date异常；

在 application.yml 中的配置项，使用 Date 类型字段接收，项目启动时报错，如下：

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'ossProperties': Could not bind properties to 'OssProperties' : prefix=aliyun.oss, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'oss.buy-deadline' to java.util.Date

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'ossProperties': Could not bind properties to 'OssProperties' : prefix=aliyun.oss, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'oss.buy-deadline' to java.util.Date

解决办法

自定义转换器

必须加上 @ConfigurationPropertiesBinding 注解，不然转换器是在启动后使用，项目启动时还是会报错

@Component
@ConfigurationPropertiesBinding
public class String2DateConverter implements Converter<String, Date> {

    @Override
    public Date convert(String source) {
        if (StringUtils.isEmpty(source)) {
            return null;
        }
        return DateUtils.parseWithTime(source);
    }
    
}