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MongoDB와 Spring Boot 함께 사용하기

Posted Nov 5, 2023
By 김도현
10 min read

연동 과정

DBMS 셋팅

MongoDB에 접속해서 DB와 Collection을 생성해준다. 여기서 Collection은 RDBMS의 Table과 같은 개념이다.

Spring Boot 셋팅

Gradle 의존성 추가

아래 의존성을 추가한다.

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implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'

Application.yml DBMS 경로 추가

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spring:
  data:
    mongodb:
      uri: mongodb+srv://{USER_NAME}:{USER_PASSWORD}@{CLUSTER_NAME}.ho2nb0a.mongodb.net/{COLLECTION_NAME}?retryWrites=true&w=majority

위와 같이 UserName, Password, ClusterName, CollectionName을 정의해주면 끝난다.

너무 오랜만이라 까먹었던 직렬화 사용법 (Getter Method)

HTTP 응답 폼을 만들기 위해 아래와 같이 작성했는데 자꾸 빈 응답 값을 내려주는 현상이 발생했다.

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package com.diger.notonlysqlboard.util.responseform;

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
import org.springframework.http.HttpStatus;

@JsonInclude(JsonInclude.Include.NON_NULL)
@AllArgsConstructor
@NoArgsConstructor
public class ResponseForm<T> {

    private Integer status;
    private T data;

    public static <T> ResponseForm<T> success(
            HttpStatus httpStatus
    ) {
        return new ResponseForm<>(
                httpStatus.value(),
                null
        );
    }

    public static <T> ResponseForm<T> success(
            HttpStatus httpStatus,
            T data
    ) {
        return new ResponseForm<T>(
                httpStatus.value(),
                data
        );
    }
}

직렬화 할 때 JVM 내부적으로 Getter메서드를 활용한다는 점을 깜빡하고 Getter를 추가하지 않았기 때문에 직렬화가 이루어지지 않게 되었다.

직렬화 대상을 다룰땐 Getter를 고려해야한다는 점을 잊지 않도록 주의하자!

MongoRepository는 Dirty Checking이 없다.

당연하게도 JPA와 딱히 관련이 없는 MongoDB는 Dirty Checking 기능이 존재하지 않는다.

즉, 아래와 같은 코드가 있을 때

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@Service
@Transactional
@RequiredArgsConstructor
public class UserAuthenticator {

    private final UserRepository userRepository;

    public void execute(LoginId loginId, Password password) {
        User user = userRepository.findByLoginIdAndPassword(
                loginId,
                password
        );

        user.updateAuthority(Authority.NORMAL);
    }
}

흔히 쓰던 JPA기반의 RDBMS였으면 Dirty Checking이 발동되어 save()메서드를 호출하지 않아도 자동으로 변경사항이 반영된다.

하지만 NoSQL은 영속성 컨텍스트를 사용하는 방식이 아니기 때문에 아래와 같이 직접 save()메서드를 호출해줘야한다.

또한 @Transactioanl 애노테이션도 딱히 필요가 없다. 만약 MongoDB가 지원하는 트랜잭션을 사용하고 싶다면 별도의 설정을 해줘야한다.

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@Service
@RequiredArgsConstructor
public class UserAuthenticator {

    private final UserRepository userRepository;

    public void execute(LoginId loginId, Password password) {
        User user = userRepository.findByLoginIdAndPassword(
                loginId,
                password
        );

        user.updateAuthority(Authority.NORMAL);
        userRepository.save(user);
    }
}

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@Configuration
public class MongoTransactionConfig {

    @Bean
    public MongoTransactionManager specifyTransactionManager(MongoDatabaseFactory mongoDatabaseFactory) {
        return new MongoTransactionManager(mongoDatabaseFactory);
    }
}

컬렉션 조회 시 이상현상

아래와 같이 게시글 엔티티를 정의했다.

Board.java

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@Getter
@AllArgsConstructor
@Builder
@Document("board")
public class Board extends BaseDocument {

    private Title title;
    private TextContent textContent;
    private StaticContent staticContent;
    private String writer;
}

StaticContent.java

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@Getter
@Document(collection = "staticContent")
public class StaticContent {
    private final List<String> links = new ArrayList<>();

    public StaticContent(List<String> value) {
        links.addAll(value);
    }

    public void validate(String value) {
        if (value.isBlank()) {
            throw new IllegalArgumentException("Content Link Must Not Be Blank");
        }
    }
}

위와 같은 List를 가지고 있는 값 타입으로 래핑해서 사용하고 있는 것인데, 이 객체를 가지고 있는 Board를 조회하려고하면 매핑 문제가 발생한다.

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Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.springframework.data.mapping.MappingException: No property value found on entity class com.diger.notonlysqlboard.core.board.domain.StaticContent to bind constructor parameter to] with root cause```

org.springframework.data.mapping.MappingException: No property value found on entity class com.diger.notonlysqlboard.core.board.domain.StaticContent to bind constructor parameter to

이 원인과 해결방법에 대해선 조금 더 알아보기로한다.

MongoDB에서 MultipartFile을 사용하다 생긴 일

아래와 같이 상위 테이블을 하나 선언했다.

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@Getter
@AllArgsConstructor
@Document("board")
public class Board extends BaseDocument {

    private final Title title;

    private final TextContent textContent;

    private final StaticContent staticContent;

    private final User writer;

    private final List<Comment> comments;
}

그리고 아래와 같이 댓글에 대한 테이블을 선언했따.

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@Getter
@AllArgsConstructor
@Document(collection = "comment")
public class Comment extends BaseDocument {
    private final String value;
    private final MultipartFile file;
    private final User writer;
}

위 도메인을 선언하고 스프링을 돌리니까 아래와 같은 에러가 발생했다.

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2023-11-08T19:23:17.573+09:00 ERROR 5873 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'boardCrateApi' defined in file [/Users/Diger/Desktop/Code/NotOnlySQL-Board/out/production/classes/com/diger/notonlysqlboard/core/board/controller/BoardCrateApi.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'boardCreator' defined in file [/Users/Diger/Desktop/Code/NotOnlySQL-Board/out/production/classes/com/diger/notonlysqlboard/core/board/service/BoardCreator.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'boardRepository' defined in com.diger.notonlysqlboard.core.board.repository.BoardRepository defined in @EnableMongoRepositories declared on NotOnlySqlBoardApplication: Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @3ce1e309
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:801) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:240) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1189) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:560) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:520) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:973) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:950) ~[spring-context-6.0.13.jar:6.0.13]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:616) ~[spring-context-6.0.13.jar:6.0.13]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.1.5.jar:3.1.5]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:738) ~[spring-boot-3.1.5.jar:3.1.5]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:440) ~[spring-boot-3.1.5.jar:3.1.5]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-3.1.5.jar:3.1.5]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) ~[spring-boot-3.1.5.jar:3.1.5]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-3.1.5.jar:3.1.5]
	at com.diger.notonlysqlboard.NotOnlySqlBoardApplication.main(NotOnlySqlBoardApplication.java:14) ~[classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'boardCreator' defined in file [/Users/Diger/Desktop/Code/NotOnlySQL-Board/out/production/classes/com/diger/notonlysqlboard/core/board/service/BoardCreator.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'boardRepository' defined in com.diger.notonlysqlboard.core.board.repository.BoardRepository defined in @EnableMongoRepositories declared on NotOnlySqlBoardApplication: Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @3ce1e309
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:801) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:240) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1189) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:560) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:520) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1417) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1337) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:910) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:788) ~[spring-beans-6.0.13.jar:6.0.13]
	... 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'boardRepository' defined in com.diger.notonlysqlboard.core.board.repository.BoardRepository defined in @EnableMongoRepositories declared on NotOnlySqlBoardApplication: Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @3ce1e309
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1770) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:598) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:520) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1417) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1337) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:910) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:788) ~[spring-beans-6.0.13.jar:6.0.13]
	... 33 common frames omitted
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @3ce1e309
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) ~[na:na]
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
	at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178) ~[na:na]
	at java.base/java.lang.reflect.Field.setAccessible(Field.java:172) ~[na:na]
	at org.springframework.util.ReflectionUtils.makeAccessible(ReflectionUtils.java:779) ~[spring-core-6.0.13.jar:6.0.13]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:536) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:703) ~[spring-core-6.0.13.jar:6.0.13]
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:422) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:379) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.lambda$createAndRegisterProperty$3(AbstractMappingContext.java:591) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:588) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na]
	at java.base/java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1779) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[na:na]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.addPropertiesForRemainingDescriptors(AbstractMappingContext.java:559) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:423) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:379) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.lambda$createAndRegisterProperty$3(AbstractMappingContext.java:591) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:588) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na]
	at java.base/java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1779) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[na:na]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.addPropertiesForRemainingDescriptors(AbstractMappingContext.java:559) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:423) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:379) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.lambda$createAndRegisterProperty$3(AbstractMappingContext.java:591) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:588) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:542) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:703) ~[spring-core-6.0.13.jar:6.0.13]
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:422) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:379) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.lambda$createAndRegisterProperty$3(AbstractMappingContext.java:591) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:588) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:542) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:703) ~[spring-core-6.0.13.jar:6.0.13]
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:422) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:379) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:280) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:206) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:92) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mapping.context.MappingContext.getRequiredPersistentEntity(MappingContext.java:74) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory.getEntityInformation(MongoRepositoryFactory.java:146) ~[spring-data-mongodb-4.1.5.jar:4.1.5]
	at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory.getTargetRepository(MongoRepositoryFactory.java:128) ~[spring-data-mongodb-4.1.5.jar:4.1.5]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:317) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:279) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.util.Lazy.getNullable(Lazy.java:245) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.util.Lazy.get(Lazy.java:114) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:285) ~[spring-data-commons-3.1.5.jar:3.1.5]
	at org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean.afterPropertiesSet(MongoRepositoryFactoryBean.java:101) ~[spring-data-mongodb-4.1.5.jar:4.1.5]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1817) ~[spring-beans-6.0.13.jar:6.0.13]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1766) ~[spring-beans-6.0.13.jar:6.0.13]
	... 44 common frames omitted

빈 주입이 안되어있다는데 도대체가 어지럽다. 아무리 살펴봐도 생성자 주입을 사용하고 있고 빈 주입이 안될 이유가 없었기 때문이다.

해결

3~4시간 동안 구글링해서 얻은 해결책들을 모두 대입해봤지만 실패했다.

근데 갑자기 번뜩임과 함께 아래와 같이 MultiparFile Type을 String으로 변경하니 해결됐다.

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@Getter
@AllArgsConstructor
@Document(collection = "comment")
public class Comment extends BaseDocument {
    private final String value;
    private final String fileLink;
    private final User writer;
}

무슨 상관인진 모르겠지만 MultipartFile 타입을 직접 사용할 땐 주의해야한다는 것을 배웠다.

이 해결방안에 대한 원리는 더 알아보기로 하자

Java
Java
This post is licensed under CC BY 4.0 by the author.
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