Question

我今天刚升级到Spring Boot 2.0.2，也是Spring-Data-MongoDB 2.0.7的一部分。

我有以下实体：

@Document
@Data
public class User {
private String username;
private String password;
private List<String> authorities;

    public User(String username, String password, List<String> authorities) {
        this.username = username;
        this.password = password;
        this.authorities = authorities;
    }
}

在我的测试中，我使用以下内容插入新用户：

mongoTemplate.save(new User("testuser", "$2a$04$OuKj.lXzPxlwgr2Jy28E4ehHuxnVZ7BuL46qX9fd6vAijcDN6UeHe", Collections.singletonList("user")));

使用Spring Boot 2.0.1（分别是Spring-Data-MongoDB 2.0.6）时，这非常有效。使用升级的Spring-Data-MongoDB版本，我收到以下错误：

org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.time.ZonedDateTime] for value 'testuser'; nested exception is java.time.format.DateTimeParseException: Text 'testuser' could not be parsed at index 0

    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:46)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:191)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:174)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPotentiallyConvertedSimpleWrite(MappingMongoConverter.java:849)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeSimpleInternal(MappingMongoConverter.java:829)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:488)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:462)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:436)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:391)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:86)
    at org.springframework.data.mongodb.core.MongoTemplate.toDocument(MongoTemplate.java:1070)
    at org.springframework.data.mongodb.core.MongoTemplate.doSave(MongoTemplate.java:1253)
    at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:1201)
    at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:1185)
....
Caused by: java.time.format.DateTimeParseException: Text 'testuser' could not be parsed at index 0
    at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
    at java.time.ZonedDateTime.parse(ZonedDateTime.java:597)
    at at.riag.scanpay.config.MongoConfig$StringToZonedDateTime.convert(MongoConfig.java:34)
    at at.riag.scanpay.config.MongoConfig$StringToZonedDateTime.convert(MongoConfig.java:28)
    at org.springframework.core.convert.support.GenericConversionService$ConverterAdapter.convert(GenericConversionService.java:385)
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:40)
    ... 71 more

所以看起来，它想要将username转换为ZonedDateTime。问题可能是我的MongoConfig，我有ZonedDateTime的自定义转换器：

@Configuration
public class MongoConfig {

    private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ISO_ZONED_DATE_TIME;

    @Bean
    public MongoCustomConversions customConversions(){
        List<Converter<?,?>> converters = new ArrayList<>();
        converters.add(ZonedDateTimeToStringConverter.INSTANCE);
        converters.add(StringToZonedDateTime.INSTANCE);
        return new MongoCustomConversions(converters);
    }

    enum StringToZonedDateTime implements Converter<String, ZonedDateTime> {

        INSTANCE;

        @Override
        public ZonedDateTime convert(String source) {
            return ZonedDateTime.parse(source, dateTimeFormatter);
        }
    }

    enum ZonedDateTimeToStringConverter implements Converter<ZonedDateTime, String> {

        INSTANCE;

        @Override
        public String convert(ZonedDateTime source) {
            return dateTimeFormatter.format(source);
        }
    }
}

当然，这些转换器不应该用于普通字符串，但它似乎是在使用新的Spring Data MongoDB版本时触发的。任何人都可以请指出我的代码问题或最新版本有问题吗？

提前致谢！

Answer 1

更新到版本2后，我遇到了同样的问题。

我的问题是我们在转换器中使用DBObject而不是org.bson.Document。例如：

public class MyCustomMappingConverter implements Converter<DBObject, MyClass>

我将其更改为：

public class MyCustomMappingConverter implements Converter<Document, MyClass>

Spring-Data-MongoDB：无法使用自定义转换器将升级后的类型转换为2.0.7

1 个答案: