我升级到spring-boot 2.1.0.RELEASE，然后在尝试将文档保存到mongodb时遵循Exception。
org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class java.time.Year.
at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46)
at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63)
at org.bson.codecs.configuration.ChildCodecRegistry.get(ChildCodecRegistry.java:51)
at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:184)
at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:199)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:141)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:45)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
at com.mongodb.operation.BulkWriteBatch$WriteRequestEncoder.encode(BulkWriteBatch.java:387)
at com.mongodb.operation.BulkWriteBatch$WriteRequestEncoder.encode(BulkWriteBatch.java:377)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
at com.mongodb.internal.connection.BsonWriterHelper.writeDocument(BsonWriterHelper.java:75)
at com.mongodb.internal.connection.BsonWriterHelper.writePayload(BsonWriterHelper.java:59)
at com.mongodb.internal.connection.BsonWriterHelper.writePayloadArray(BsonWriterHelper.java:51)
at com.mongodb.internal.connection.SplittablePayloadBsonWriter.writeEndDocument(SplittablePayloadBsonWriter.java:51)
at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:118)
at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:41)
at com.mongodb.internal.connection.CommandMessage.addDocumentWithPayload(CommandMessage.java:179)
at com.mongodb.internal.connection.CommandMessage.encodeMessageBodyWithMetadata(CommandMessage.java:163)
at com.mongodb.internal.connection.RequestMessage.encode(RequestMessage.java:138)
at com.mongodb.internal.connection.CommandMessage.encode(CommandMessage.java:57)
at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:244)
at com.mongodb.internal.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:99)
at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:444)
at com.mongodb.internal.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:72)
at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:200)
at com.mongodb.internal.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:269)
at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:131)
at com.mongodb.operation.MixedBulkWriteOperation.executeCommand(MixedBulkWriteOperation.java:418)
at com.mongodb.operation.MixedBulkWriteOperation.executeBulkWriteBatch(MixedBulkWriteOperation.java:256)
at com.mongodb.operation.MixedBulkWriteOperation.access$700(MixedBulkWriteOperation.java:67)
at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:200)
at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:191)
at com.mongodb.operation.OperationHelper.withReleasableConnection(OperationHelper.java:424)
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:191)
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:67)
at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:193)
at com.mongodb.client.internal.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:960)
at com.mongodb.client.internal.MongoCollectionImpl.executeInsertOne(MongoCollectionImpl.java:494)
at com.mongodb.client.internal.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:478)
at com.mongodb.client.internal.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:472)
at org.springframework.data.mongodb.core.MongoTemplate$6.doInCollection(MongoTemplate.java:1417)
at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:535)
at org.springframework.data.mongodb.core.MongoTemplate.insertDocument(MongoTemplate.java:1410)
at org.springframework.data.mongodb.core.MongoTemplate.doInsert(MongoTemplate.java:1217)
at org.springframework.data.mongodb.core.MongoTemplate.insert(MongoTemplate.java:1150)
at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.save(SimpleMongoRepository.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:359)
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:644)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:608)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.MethodInvocationValidator.invoke(MethodInvocationValidator.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy59.save(Unknown Source)
at de.bindoc.mongoyeartest.FoobarRepositoryTest.save(FoobarRepositoryTest.kt:20)
这是文档：（在kotlin中）
data class Foobar(val id: ObjectId? = null, val year: Year, val name: String)
这是存储库：（在kotlin中）
interface FoobarRepository: MongoRepository<Foobar, ObjectId>
当我在save上调用FoobarRepository函数时，将触发异常。
我创建了一个github存储库来显示此行为。
https://github.com/mheider/spring-boot-data-mongo-year-test
我必须注册自定义编解码器或转换器吗？
答案 0 :(得分：4)
答案是注册MongoCustomConverters。
我刚刚添加了@Configuration之后，就可以了。 （还更新了github存储库）
@Configuration
class MongoCustomConverterConfig() {
@Bean
fun mongoCustomConversions(): MongoCustomConversions =
MongoCustomConversions(listOf(
YearToIntConverter(),
IntToYearConverter()
))
@WritingConverter
class YearToIntConverter: Converter<Year, Int> {
override fun convert(p0: Year): Int? = p0.value
}
@ReadingConverter
class IntToYearConverter: Converter<Int, Year> {
override fun convert(p0: Int): Year? = Year.of(p0)
}
}