我在Spring Data MongoDB中使用Spring Cloud Brixton.SR4
。Spring Mongodb - 无法为java.time.Period编写自定义转换器
我有一个非常简单的实体:
@Document
public class Foo{
private Period period;
//getter & setter
}
因为java.time.Period
不受jsr310
我创建定制的转换器支持:
class Converters {
@Component
@WritingConverter
static class PeriodToStringConverter implements Converter<Period, String> {
@Override
public String convert(Period period) {
return period.toString();
}
}
@ReadingConverter
@Component
static class StringToPeriodConverter implements Converter<String, Period> {
@Override
public Period convert(String s) {
return Period.parse(s);
}
}
现在,我在配置类扩展AbstractMongoConfiguration
注册它们:
@Bean
@Override
public MappingMongoConverter mappingMongoConverter() throws Exception {
DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory());
MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext());
final CustomConversions conversions = customConversions();
log.info("hasCustomWriteTarget(Period.class): " + conversions.hasCustomWriteTarget(Period.class));
log.info("hasCustomWriteTarget(Period.class, String.class): " + conversions.hasCustomWriteTarget(Period.class, String.class));
log.info("hasCustomReadTarget(String.class, Period.class): " + conversions.hasCustomReadTarget(String.class, Period.class));
converter.setCustomConversions(conversions);
converter.afterPropertiesSet(); //probably not needed, trying out of despair
return converter;
}
@Bean
@Override
public CustomConversions customConversions() {
List<Converter> converters = new ArrayList<>();
converters.add(new Converters.PeriodToStringConverter());
converters.add(new Converters.StringToPeriodConverter());
return new CustomConversions(converters);
}
当我开始我的应用我看到日志:
hasCustomWriteTarget(Period.class): true
hasCustomWriteTarget(Period.class, String.class): true
hasCustomReadTarget(String.class, Period.class): true
现在我创建一个新的Foo
并将其保存到我的仓库:
Foo foo = new Foo();
foo.setPeriod(Period.of(2, 0, 1));
fooRepository.save(foo);
现在的怪事发生了:
在MongoDB中我看到:
{
"_id": ObjectId("xxxx"),
"period": {
"years" : 0,
"months" : 2,
"days" : 1
}
}
因此,那已经是错误的了。它应该被保存为String
当我尝试读取Java中的对象我得到:
org.springframework.data.mapping.model.MappingException: No property null found on entity class java.time.Period to bind constructor parameter to!
我调试在MappingMongoConverter
代码:
if (conversions.hasCustomReadTarget(dbo.getClass(), rawType)) {
return conversionService.convert(dbo, rawType);
}
,因为我的目标是不存储作为一个字符串dbo
变量实际上是一个BasicDbObject
,因此我没有这个转换器。
任何想法为什么我的写转换器不被用来坚持Period
?
我在我的类路径上有jackson-datatype-jdk8
,这可能是问题吗?杰克逊会坚持参与Mongodb吗?
编辑
这似乎是一个注册问题。当我调试代码时,在MappingMongoConverter
中使用的CustomConversion
对象与我创建的对象不同。而且它不具有创建