인텔리제이사의 Webstorm을 사용하신다고 알고 있습니다.'( )'마다 색상이 다다른데 어떤 theme을 사용하는지 알고 싶어요~

안녕하세요.@Configuration 애노테이션이 어떻게 동작되는지 헷갈리는 부분이 생겨 문의드립니다.'스프링 부트 개념과 활용' 강좌의 '자동 설정 만들기 1부: Starter와 AutoConfigure'에서 예제를 통해 @EnableAutoConfigure를 설명해주셨습니다.그 때는 HolomanConfiguration.java에 @Configuration 애노테이션을 넣은 후, spring.factories 파일을 생성하였습니다. 그 결과 @EnableAutoConfigure로 Holoman 빈이 등록되게 하였습니다.그런데, 이번 강좌에서는 AppConfig.java에 @Configuration 사용 시에, spring.factories를 사용하시지 않더라고요. 그래서 @Configuration 애노테이션의 부모를 보니, 또 @Component가 있더라고요. 이 것은 @ComponentScan으로 빈으로 등록되면서, 그 필드에 있는 ModelMapper, PasswordEncoder 등등이 빈으로 등록되는건가요?

안녕하세요, 과제 제출시 다음과 같은 오류가 발생합니다.제대로 제출이 될 때도 있고, 오류가 발생할 때는 계속해서 발생하는데 아는 개발자 친구에게 물어보니 제출하는 곳의 서버 에러 같다는 얘기를 듣고 문의드립니다. 아래는 bash ./submit.sh hash값 입력시 발생하는 메세지 전부 붙인 것이고요, Bold처리한 쪽을 보면서 서버 에러를 문의해보라는 얘기를 들어서 질문합니다.확인 부탁드립니다. File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/cli/run.py", line 400, in _run_legacytag=tag)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/base.py", line 21, in _methodreturn cls.session.worker_thread.execute(coro)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/session.py", line 64, in executeraise resultFile "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/session.py", line 48, in runresult = loop.run_until_complete(coro)File "/Users/sangok/miniconda3/lib/python3.7/asyncio/base_events.py", line 573, in run_until_completereturn future.result()File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/kernel.py", line 107, in get_or_createasync with rqst.fetch() as resp:File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/request.py", line 391, in aenterraise BackendAPIError(raw_resp.status, raw_resp.reason, msg)ai.backend.client.exceptions.BackendAPIError: BackendAPIError(500, 'Internal Server Error', {'type': 'https://api.backend.ai/probs/kernel-creation-failed', 'title': 'Kernel creation has failed.', 'agent-details': {'type': 'https://api.backend.ai/probs/agent-timeout', 'title': None}})During handling of the above exception, another exception occurred:Traceback (most recent call last):File "/Users/sangok/miniconda3/bin/backend.ai", line 11, in sys.exit(main())File "/Users/sangok/miniconda3/lib/python3.7/site-packages/click/core.py", line 764, in callreturn self.main(args, kwargs)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/click/core.py", line 717, in mainrv = self.invoke(ctx)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/click/core.py", line 1137, in invokereturn _process_result(sub_ctx.command.invoke(sub_ctx))File "/Users/sangok/miniconda3/lib/python3.7/site-packages/click/core.py", line 956, in invokereturn ctx.invoke(self.callback, ctx.params)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/click/core.py", line 555, in invokereturn callback(args, **kwargs)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/cli/run.py", line 610, in run_run_cases_legacy()File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/cli/run.py", line 574, in _run_cases_legacyclean_cmd, build_cmd, exec_cmd)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/cli/run.py", line 402, in _run_legacyprint_error(e)File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/cli/pretty.py", line 141, in print_errortext = ''.join(format_error(exc))File "/Users/sangok/miniconda3/lib/python3.7/site-packages/ai/backend/client/cli/pretty.py", line 122, in format_erroryield 'nu279c ' + agent_details['title']TypeError: can only concatenate str (not "NoneType") to str

backend.ai 까지 제대로 설치한것 같은데아래와 같은 에러가 뜨네요.Session token prefix: a683fbd89cIn the legacy mode, all cases will run serially!✘ BackendAPIError: 500 Internal Server ErrorKernel creation has failed.➜ This is an agent-side error. Check the agent status or ask the administrator for help.

✘ BackendAPIError: 500 Internal Server ErrorKernel creation has failed.라고 떠서 과제제출이 되지 않는데 어떻게 해결할 수 있을까요???

ERROR conda.core.link:_execute(507): An error occurred while uninstalling package 'defaults::conda-4.5.12-py27_0'.WindowsError(5, '')Attempting to roll back.현재 파이썬이 3.6.8버전도 함께 깔려 있어서 이런 오류가 뜨는 것 같은데 어떻게 해결해야 할까요..?

안녕하세요.이전 질문에 답해 주신 것처럼 해서-다른 문제가 있었지만 그 부분은 아직 진행 전이라 주석처리하고-해결이 되었습니다. 하지만 제가 작성했던 소스로 다시 같은 방식으로 진행 했는데 똑같은 문제가 나오더군요. 여차저차해서 일단 해결은 됐는데 혹시 저와 같은 문제를 겪는 분을 위해 글을 남깁니다.해결 방법은 appsettings.json > ConnectionStrings > "MyAppConnection": "Server=(localdb)\MSSQLLocalDB; ..."이 부분이었는데요, 전 이미 SQLExpress가 설치 되어 있어서 해당 부분을 SQLExpress로 세팅하고 진행을 했습니다. DB 및 테이블도 잘 생성되고 문제가 없었는데 이전 질문과 같이 seedDatabase함수에서 Teachers 객체가 없다고 나오더군요. 일단 예제와 똑같이 localdb로 세팅해서 해결이 되었습니다.원인은 모르겠습니다. 다른 아시는분께 설명을 부탁하며 이만...

실제 프로젝트에 적용하려고 하니 이름으로 쿼리메소드를 생성하는 방법은 메소드 이름이 너무 길어져서 못쓸꺼 같아서 QueryDSL이나 Specification을 사용하려고 하는데 무엇을 사용할 지 고민이 됩니다.구글링 결과 QueryDSL이 Specification보다 type-safe하고 심플하게 작성할 수 있다는 장점때문에 많이 선호하는 것 같아 보입니다.백기선님은 이름으로 쿼리메소드 생성, QueryDSL, Specification 중 어떤 방법을 선호하시나요?? 그리고 선호하시는 이유가 무엇인지 궁금합니다.

안녕하세요 강의를 잘 수강하고 있습니다.JPA를 h2와 연동해 사용할 경우 엔티티와 매핑될 테이블을 직접 생성해 주지 않아도 되는데에 반해, 일반 RDBMS와 연동해 사용할 때에는 테이블을 직접 생성해 줘야 하는 것으로 알고 있습니다. 후자의 경우야 너무나 당연한 내용이라고 생각이 들지만, 어떻게 h2에서는 테이블을 직접 생성해주지 않아도 되는 것인지 궁금합니다. 또 이와 비슷한 원리로 RDBMS에서도 테이블을 자동으로 생성될 수 있도록 설정하는 방법이 있을까요?

강의 잘 듣고 있습니다.그런데 Popup_3_Align_Important 강의를 따라하다가 강의중에 강사님이PopupViewController.swift 와 PopupViewController.storyboard 파일을 생성했는데요제가 파일명이 길어서 간단하게 아래와 같이 줄였습니다.PopupView.swift 와 PopupView.storyboard 파일을 생성후 작업해서 실행해보니 팝업 실행시에 오류나서 화면이 멈추더군요.. 다른 문제가 있나 이것 저것 수정해보다 결국 파일명을 강사님이 한것과 똑같이 수정하니 잘 동작하더군요이상해서 질문 남깁니다. 혹시 파일명을 정할때 무슨 규칙 같은게 있나요?

(사진)

(사진)

이전까지 잘 사용하고 있다가 오늘 과제 제출하려고 실행시키니 아래와 같은 에러가 발생합니다.✘ BackendAPIError: 500 Internal Server ErrorKernel creation has failed.➜ This is an agent-side error. Check the agent status or ask the administrator for help.어떻게 해결할 수 있나요?

강의에 대한 직접적인 질문이 아니라 따로 질문할 곳을 찾으려 했는데 찾지 못해서 피치못하게 강의에다가 질문을 달게 되었습니다. 다름이아니라 제가 평소 공부할 때 필기한 내용들을 블로그에 업로드를 하는데 해당 강의는 유료 강의이다 보니 강의에 나온 코드들을 올리는게 문제가 될 수 있을까 싶어서 질문드렸습니다. 업로드 시에는 강의에서 작성된 코드와 설명해주신 내용들이 주석으로 달려 업로드가 될 것 같습니다. 물론 출처를 표기할 생각이긴 하나 유료 강의이니 충분히 문제가 될 수 있을 것 같아 질문드립니다.

안녕하세요 :-)실행해보았는데 카메라롤 앨범을 선택하면 PhotoCollectionCollectionview에 사진이 중간중간 안나오는데 왜 그럴까요?

모든 강좌에 소리가 안나오는데 원래 소리가 안나오는강좌인가요?음량을 최대로 키워도 안나오고 다른 인프런 강좌의 경우에는 소리가 잘나오는데해결방법이 궁금합니다.

Autoselected keyboard map en-us이렇게만 뜹니다. 어떻게 해결해야 하나요?

'''void initAnimalName(){strAnimal[0] = "monkey";strAnimal[1] = "snake";strAnimal[2] = "lion";strAnimal[3] = "tiger";strAnimal[4] = "pig";strAnimal[5] = "rabbit";strAnimal[6] = "cow";strAnimal[7] = "chicken";strAnimal[8] = "dog";strAnimal[9] = "bird";}'''이 코트에서 모든 등호 밑에 빨간 줄이 생기고 아래와 같이 에러가 뜨는데 어떻게 수정할 수 있을까요?a value of type "const char " cannot be assigned to an entity of type "char "

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">4.0.0<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --></parent><groupId>com.antMart.com</groupId><artifactId>antMall</artifactId><version>0.0.1-SNAPSHOT</version><name>antMall</name><description>Demo project for Spring Boot</description><properties> <java.version>1.8</java.version></properties><dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.restdocs</groupId> <artifactId>spring-restdocs-mockmvc</artifactId> <scope>test</scope> </dependency></dependencies><build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins></build><repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> </repository></repositories><pluginRepositories> <pluginRepository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </pluginRepository> <pluginRepository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> </pluginRepository></pluginRepositories>전체 pom.xml 소스 첨부드립니다 .저는 저기서 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> <scope>test</scope> </dependency>이부분만 넣으면 에러가 와장창 떠버리네요 이유를 모르겠습니다 clean도 해보고 폴더에 가서 maven을 직접 지우고 다시 빌드 해봐도 마찬가지네요 ..좀 알려주세요 .에러내용을 이미지로 첨부드리고 싶었는데 이미지를 올릴수가 없네요 여기는 ..그래서 복사해서 첨부합니다.Description Resource Path Location TypeThe project cannot be built until build path errors are resolved antMall Unknown Java ProblemThe container 'Maven Dependencies' references non existing library 'C:Usersblossom.m2repositoryorgspringframeworkbootspring-boot-starter-web2.0.3.RELEASEspring-boot-starter-web-2.0.3.RELEASE.jar' antMall Build path Build Path ProblemMissing artifact org.yaml:snakeyaml:jar:1.19 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.xmlunit:xmlunit-core:jar:2.5.1 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.restdocs:spring-restdocs-mockmvc:jar:2.0.1.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.restdocs:spring-restdocs-core:jar:2.0.1.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.data:spring-data-jpa:jar:2.0.8.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.data:spring-data-commons:jar:2.0.8.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-test:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-test-autoconfigure:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-starter:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-starter-web:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-starter-tomcat:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-starter-test:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.springframework.boot:spring-boot-starter-logging:jar:2.0.3.RELEASE pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact 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Dependency ProblemMissing artifact org.jboss:jandex:jar:2.0.3.Final pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.javassist:javassist:jar:3.22.0-GA pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.hibernate.validator:hibernate-validator:jar:6.0.10.Final pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.2.Final pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.hibernate:hibernate-core:jar:5.2.17.Final pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.hamcrest:hamcrest-library:jar:1.3 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.hamcrest:hamcrest-core:jar:1.3 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.assertj:assertj-core:jar:3.9.1 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.aspectj:aspectjweaver:jar:1.8.13 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.5.31 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.31 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.31 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.apache.logging.log4j:log4j-to-slf4j:jar:2.10.0 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact org.apache.logging.log4j:log4j-api:jar:2.10.0 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact net.minidev:json-smart:jar:2.3 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact net.minidev:accessors-smart:jar:1.2 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact net.bytebuddy:byte-buddy:jar:1.7.11 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact net.bytebuddy:byte-buddy-agent:jar:1.7.11 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact junit:junit:jar:4.12 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact javax.validation:validation-api:jar:2.0.1.Final pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact javax.transaction:javax.transaction-api:jar:1.2 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact javax.servlet:javax.servlet-api:jar:3.1.0 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact javax.annotation:javax.annotation-api:jar:1.3.2 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact dom4j:dom4j:jar:1.6.1 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.zaxxer:HikariCP:jar:2.7.9 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.jayway.jsonpath:json-path:jar:2.4.0 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.h2database:h2:jar:1.4.197 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.9.6 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.9.6 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.9.6 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml.jackson.core:jackson-databind:jar:2.9.6 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml.jackson.core:jackson-core:jar:2.9.6 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml.jackson.core:jackson-annotations:jar:2.9.0 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact com.fasterxml:classmate:jar:1.3.4 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact ch.qos.logback:logback-core:jar:1.2.3 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact ch.qos.logback:logback-classic:jar:1.2.3 pom.xml /antMall line 1 Maven Dependency ProblemMissing artifact antlr:antlr:jar:2.7.7 pom.xml /antMall line 1 Maven Dependency ProblemFailed to read artifact descriptor for antlr:antlr:jar:2.7.7org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for antlr:antlr:jar:2.7.7at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:282)at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:198)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.resolveCachedArtifactDescriptor(DefaultDependencyCollector.java:535)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.getArtifactDescriptorResult(DefaultDependencyCollector.java:519)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:409)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:363)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.process(DefaultDependencyCollector.java:351)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.doRecurse(DefaultDependencyCollector.java:504)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:458)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:363)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.process(DefaultDependencyCollector.java:351)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.doRecurse(DefaultDependencyCollector.java:504)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:458)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:363)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.process(DefaultDependencyCollector.java:351)at org.eclipse.aether.internal.impl.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:254)at org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:316)at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:172)at org.apache.maven.project.DefaultProjectBuilder.resolveDependencies(DefaultProjectBuilder.java:215)at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:188)at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:119)at org.eclipse.m2e.core.internal.embedder.MavenImpl.readMavenProject(MavenImpl.java:636)at org.eclipse.m2e.core.internal.project.registry.DefaultMavenDependencyResolver.resolveProjectDependencies(DefaultMavenDependencyResolver.java:63)at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refreshPhase2(ProjectRegistryManager.java:530)at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager$3.call(ProjectRegistryManager.java:492)at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager$3.call(ProjectRegistryManager.java:1)at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:496)at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:351)at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:298)at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration0(ProjectConfigurationManager.java:405)at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$2.call(ProjectConfigurationManager.java:352)at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$2.call(ProjectConfigurationManager.java:1)at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1351)at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:349)at org.eclipse.m2e.core.ui.internal.UpdateMavenProjectJob.runInWorkspace(UpdateMavenProjectJob.java:77)at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:39)at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to transfer antlr:antlr:pom:2.7.7 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact antlr:antlr:pom:2.7.7 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:444)at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:267)... 41 moreCaused by: org.eclipse.aether.transfer.ArtifactTransferException: Failure to transfer antlr:antlr:pom:2.7.7 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact antlr:antlr:pom:2.7.7 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.newException(DefaultUpdateCheckManager.java:238)at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:206)at org.eclipse.aether.internal.impl.DefaultArtifactResolver.gatherDownloads(DefaultArtifactResolver.java:585)at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:503)at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:421)... 44 morepom.xml /antMall line 1 Maven Dependency Problem이 에러들이 전부 pom.xml에 jpa 추가하는 부분만 없애면 다 사라지거던요 ..이유를 좀 알수잇을까요

선생님 안녕하세요~ 우선 게임만들기 패키지 전부 재미있게 수강하였고,과제도 전부 수행하였습니다 ^^ 많이 배운 것 같습니다. 좋은 강의 감사합니다. ^^한가지 해결하지 못한 문제가 있는데, 게임 실행시에 규칙적으로 중간중간 속도가 느려지는현상이 발생합니다. 코드의 문제인지 여러가지를 시도해봤는데,, 이러한 문제는 "Game2D("This is my digital canvas!", 1024, 768, false, 2)에서 "true"로 콘솔을 전체하면으로 바꾸고 ,dt값을 좀 빠르게 하여 실행하면 중간중간 느려지는 현상이 사라지더군요..(아니면 전체 속도가 빨라져서 느려지는 현상을 제가 느끼지 못한건지도...)보통 이렇게 속도가 일정하지 않는 현상은 왜 발생하고, 어떤 레퍼런스를 참고하여 문제를해결 할 수 있을까요?? 궁금합니다!!