=========================================[질문 템플릿]1. 강의 내용과 관련된 질문인가요? (예/아니오)2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오)3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오)[질문 내용]여기에 질문 내용을 남겨주세요.   24강 JPA강의에서 통합테스트 회원가입 부분 테스트 했는데요 강의 그대로 따라했는데 오류 뜨네요   java.lang.IllegalArgumentException: No visible constructors in class hello.hellospring.SpringConfig at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:763) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:662) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy.generate(ClassLoaderAwareGeneratorStrategy.java:57) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:358) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:585) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.3.16.jar:5.3.16] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:572) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:419) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:447) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:268) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:325) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:147) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.5.10.jar:2.5.10] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:448) ~[spring-boot-2.5.10.jar:2.5.10] at org.springframework.boot.SpringApplication.run(SpringApplication.java:339) ~[spring-boot-2.5.10.jar:2.5.10] at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:136) ~[spring-boot-test-2.5.10.jar:2.5.10] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138) ~[spring-test-5.3.16.jar:5.3.16] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$6(ClassBasedTestDescriptor.java:350) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:355) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$7(ClassBasedTestDescriptor.java:350) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na] at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na] at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na] at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) ~[na:na] at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) ~[na:na] at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) ~[na:na] at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) ~[na:na] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:349) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$4(ClassBasedTestDescriptor.java:270) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:269) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$2(ClassBasedTestDescriptor.java:259) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at java.base/java.util.Optional.orElseGet(Optional.java:369) ~[na:na] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$3(ClassBasedTestDescriptor.java:258) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:101) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:100) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:65) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:111) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:111) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:79) ~[junit-platform-engine-1.7.2.jar:1.7.2] at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84) ~[junit-platform-engine-1.7.2.jar:1.7.2] at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71) ~[junit5-rt.jar:na] at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38) ~[junit-rt.jar:na] at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11) ~[idea_rt.jar:na] at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35) ~[junit-rt.jar:na] at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235) ~[junit-rt.jar:na] at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) ~[junit-rt.jar:na] 2022-03-17 17:43:40.975 ERROR 32732 --- [ main] o.s.test.context.TestContextManager : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@4aa83f4f] to prepare test instance [hello.hellospring.service.MemberServiceIntegrationTest@38d17d80] java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138) ~[spring-test-5.3.16.jar:5.3.16] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$6(ClassBasedTestDescriptor.java:350) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:355) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$7(ClassBasedTestDescriptor.java:350) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na] at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na] at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na] at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) ~[na:na] at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) ~[na:na] at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) ~[na:na] at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) ~[na:na] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:349) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$4(ClassBasedTestDescriptor.java:270) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:269) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$2(ClassBasedTestDescriptor.java:259) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at java.base/java.util.Optional.orElseGet(Optional.java:369) ~[na:na] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$3(ClassBasedTestDescriptor.java:258) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:101) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:100) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:65) ~[junit-jupiter-engine-5.7.2.jar:5.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:111) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:111) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:79) ~[junit-platform-engine-1.7.2.jar:1.7.2] at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84) ~[junit-platform-engine-1.7.2.jar:1.7.2] at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) ~[junit-platform-engine-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75) ~[junit-platform-launcher-1.7.2.jar:1.7.2] at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71) ~[junit5-rt.jar:na] at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38) ~[junit-rt.jar:na] at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11) ~[idea_rt.jar:na] at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35) ~[junit-rt.jar:na] at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235) ~[junit-rt.jar:na] at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) ~[junit-rt.jar:na] Caused by: java.lang.IllegalArgumentException: No visible constructors in class hello.hellospring.SpringConfig at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:763) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:662) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy.generate(ClassLoaderAwareGeneratorStrategy.java:57) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:358) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:585) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.3.16.jar:5.3.16] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:572) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:419) ~[spring-core-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:447) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:268) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:325) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:147) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564) ~[spring-context-5.3.16.jar:5.3.16] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.5.10.jar:2.5.10] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:448) ~[spring-boot-2.5.10.jar:2.5.10] at org.springframework.boot.SpringApplication.run(SpringApplication.java:339) ~[spring-boot-2.5.10.jar:2.5.10] at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:136) ~[spring-boot-test-2.5.10.jar:2.5.10] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) ~[spring-test-5.3.16.jar:5.3.16] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-5.3.16.jar:5.3.16] ... 69 common frames omitted java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124) at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190) at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248) at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$6(ClassBasedTestDescriptor.java:350) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:355) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$7(ClassBasedTestDescriptor.java:350) at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:349) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$4(ClassBasedTestDescriptor.java:270) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:269) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$2(ClassBasedTestDescriptor.java:259) at java.base/java.util.Optional.orElseGet(Optional.java:369) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$3(ClassBasedTestDescriptor.java:258) at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:101) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:100) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:65) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:111) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:111) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:79) at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84) at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75) at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71) at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38) at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) Caused by: java.lang.IllegalArgumentException: No visible constructors in class hello.hellospring.SpringConfig at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:763) at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:662) at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33) at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) at org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy.generate(ClassLoaderAwareGeneratorStrategy.java:57) at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:358) at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:585) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:572) at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:419) at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:447) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:268) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:325) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:147) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:448) at org.springframework.boot.SpringApplication.run(SpringApplication.java:339) at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:136) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ... 69 more   오류가 이런 내용인데 SpringConfig 뭔가 나오는데 찾을수가 없어요 ..  

예제 코드가 나와있는 사이트에 접속은 했는데 파이썬이나 다른 어떠한 프로그램 언어도  사용해본 경험이 없어서 그런지 예제 파일을 어떻게 활용해야하고.. 강의를 통해 배운 내용을 어떻게 활용해서 공부해야 할지 감을 못 잡겠습니다.. 예제 파일이 이런식으로 나오던데 이게 뜻하는게 무엇인가요 ..? 제가 아무것도 쓰여지지 않은 백지에 예제 파일과 똑같이 작성 할 수 있을 때 까지 연습을 해야 하는걸까요?

두 문법에 차이가 어떤건지 알 수 있을까요? 결과값이 다르게 나오는데 이해하기가 어렵네요 ..  

제로초님 바쁘신데 항상 감사합니다. 커뮤니티 다른 유사한 질문들 보면서 해결해보려고 했는데 저는 안되네요, 강의 그대로 따라하는데 비스한 오류같은데 어디서 잘못된걸까요 도와주세요..   프론트앤드서버쪽 콘솔입니다 Warning: MenuItem should not leave undefined `key`. 3. getProps after dispatches has store state {   user: {     loadMyInfoLoading: false,     loadMyInfoDone: true,     loadMyInfoError: null,     loadUserLoading: false,     loadUserDone: false,     loadUserError: null,     followLoading: false,     followDone: false,     followError: null,     unfollowLoading: false,     unfollowDone: false,     unfollowError: null,     logInLoading: false,     logInDone: false,     logInError: null,     logOutLoading: false,     logOutDone: false,     logOutError: null,     signUpLoading: false,     signUpDone: false,     signUpError: null,     changeNicknameLoading: false,     changeNicknameDone: false,     changeNicknameError: null,     loadFollowingsLoading: false,     loadFollowingsDone: false,     loadFollowingsError: null,     loadFollowersLoading: false,     loadFollowersDone: false,     loadFollowersError: null,     removeFollowerLoading: false,     removeFollowerDone: false,     removeFollowerError: null,     me: null,     userInfo: null   },   post: {     mainPosts: [       [Object], [Object],       [Object], [Object],       [Object], [Object],       [Object], [Object],       [Object], [Object]     ],     singlePost: null,     imagePaths: [],     hasMorePosts: true,     likePostLoading: false,     likePostDone: false,     likePostError: null,     unlikePostLoading: false,     unlikePostDone: false,     unlikePostError: null,     loadPostLoading: false,     loadPostDone: false,     loadPostError: null,     loadPostsLoading: false,     loadPostsDone: true,     loadPostsError: null,     addPostLoading: false,     addPostDone: false,     addPostError: null,     removePostLoading: false,     removePostDone: false,     removePostError: null,     addCommentLoading: false,     addCommentDone: false,     addCommentError: null,     uploadImagesLoading: false,     uploadImagesDone: false,     uploadImagesError: null,     retweetLoading: false,     retweetDone: false,     retweetError: null   } } {} 4. WrappedApp created new store with withRedux(AvoCode) {   initialState: undefined,   initialStateFromGSPorGSSR: {     user: {       loadMyInfoLoading: false,       loadMyInfoDone: true,       loadMyInfoError: null,       loadUserLoading: false,       loadUserDone: false,       loadUserError: null,       followLoading: false,       followDone: false,       followError: null,       unfollowLoading: false,       unfollowDone: false,       unfollowError: null,       logInLoading: false,       logInDone: false,       logInError: null,       logOutLoading: false,       logOutDone: false,       logOutError: null,       signUpLoading: false,       signUpDone: false,       signUpError: null,       changeNicknameLoading: false,       changeNicknameDone: false,       changeNicknameError: null,       loadFollowingsLoading: false,       loadFollowingsDone: false,       loadFollowingsError: null,       loadFollowersLoading: false,       loadFollowersDone: false,       loadFollowersError: null,       removeFollowerLoading: false,       removeFollowerDone: false,       removeFollowerError: null,       me: null,       userInfo: null     },     post: {       mainPosts: [Array],       singlePost: null,       imagePaths: [],       hasMorePosts: true,       likePostLoading: false,       likePostDone: false,       likePostError: null,       unlikePostLoading: false,       unlikePostDone: false,       unlikePostError: null,       loadPostLoading: false,       loadPostDone: false,       loadPostError: null,       loadPostsLoading: false,       loadPostsDone: true,       loadPostsError: null,       addPostLoading: false,       addPostDone: false,       addPostError: null,       removePostLoading: false,       removePostDone: false,       removePostError: null,       addCommentLoading: false,       addCommentDone: false,       addCommentError: null,       uploadImagesLoading: false,       uploadImagesDone: false,       uploadImagesError: null,       retweetLoading: false,       retweetDone: false,       retweetError: null     }   } } HYDRATE {   type: '__NEXT_REDUX_WRAPPER_HYDRATE__',   payload: {     user: {       loadMyInfoLoading: false,       loadMyInfoDone: true,       loadMyInfoError: null,       loadUserLoading: false,       loadUserDone: false,       loadUserError: null,       followLoading: false,       followDone: false,       followError: null,       unfollowLoading: false,       unfollowDone: false,       unfollowError: null,       logInLoading: false,       logInDone: false,       logInError: null,       logOutLoading: false,       logOutDone: false,       logOutError: null,       signUpLoading: false,       signUpDone: false,       signUpError: null,       changeNicknameLoading: false,       changeNicknameDone: false,       changeNicknameError: null,       loadFollowingsLoading: false,       loadFollowingsDone: false,       loadFollowingsError: null,       loadFollowersLoading: false,       loadFollowersDone: false,       loadFollowersError: null,       removeFollowerLoading: false,       removeFollowerDone: false,       removeFollowerError: null,       me: null,       userInfo: null     },     post: {       mainPosts: [Array],       singlePost: null,       imagePaths: [],       hasMorePosts: true,       likePostLoading: false,       likePostDone: false,       likePostError: null,       unlikePostLoading: false,       unlikePostDone: false,       unlikePostError: null,       loadPostLoading: false,       loadPostDone: false,       loadPostError: null,       loadPostsLoading: false,       loadPostsDone: true,       loadPostsError: null,       addPostLoading: false,       addPostDone: false,       addPostError: null,       removePostLoading: false,       removePostDone: false,       removePostError: null,       addCommentLoading: false,       addCommentDone: false,       addCommentError: null,       uploadImagesLoading: false,       uploadImagesDone: false,       uploadImagesError: null,       retweetLoading: false,       retweetDone: false,       retweetError: null     }   } } error - components\PostCard.js (70:21) @ PostCard TypeError: Cannot read properties of null (reading 'Likers')   68 |   }, [id]);   69 |  > 70 |   const liked = post.Likers.find((v) => v.id === id);      |                     ^   71 |   return (   72 |     <div style={{ marginBottom: 20 }}>   73 |       <Card error - components\PostCard.js (70:21) @ PostCard TypeError: Cannot read properties of null (reading 'Likers')   68 |   }, [id]);   69 | > 70 |   const liked = post.Likers.find((v) => v.id === id);      |                     ^   71 |   return (   72 |     <div style={{ marginBottom: 20 }}>   ------------------------------------------------ 여기는 back> routes> post.js  router.get 관련코드입니다. router.get('/:postId/', async (req, res, next) => { // GET / post/1   try {     const post = await Post.findOne({       where: { id: req.params.postId },     });     if (!post) {       return res.status(404).send('존재하지 않는 게시글입니다.');     }     const fullPost = await Post.findOne({       where: { id: post.id },       include: [{         model: Post,         as: 'Retweet',         include: [{           model: User,           attributes: ['id', 'nickname'],         }, {           model: Image,         }]       }, {         model: User,         attributes: ['id', 'nickname'],       }, {         model: User,         as: 'Likers',         attributes: ['id', 'nickname'],       }, {         model: Image,       }, {         model: Comment,         include: [{           model: User,           attributes: ['id', 'nickname'],         }]       },{         model: User,         as: 'Likers',         attributes: ['id'],       }],     });     res.status(200).json(fullPost);   } catch(error) {     console.error(error);     next(error);   } });

게시판 찾아보았을때 저와 같은 오류가 있길래 저도 아파치 import인것 같아 제 address를 추가해도  빨간줄이 사라지지 않습니다.. 무슨 문제인지 알려주시면 감사하겠습니다.     

저랑 같은 질문에 대한 답변이 있더라구요.현재 구조상 어려운 것 같다고 하셨는데, 혹시 addTodo() 메서드의 로직을 store.js의 addOneTodo() 로 옮겨서 newTodoItem이나 showModal의 값을 그쪽에서 변경하도록 하는 것은 구조상 바람직하지 않은 건가요?

UploadProductPage  안에 있는 FileUpload 컴포넌트에서 이미지를 업로드할 때 ,  image state를 UploadProductPage 에도 선언하시고 FileUpload 안에도 선언하셨는데,  FileUpload 에서 image를 선언하고 props로 FileUpload 전달해 주면 굳이 2번 해주지 않아도 되지 않나요??  혹시 이거는 재사용 때문에 설계를 이렇게 하신건지 궁금합니다.         

10분 57초에 removeEventlistener ~,makeRED를 하면서 red가 지워지지고 removeEventlistener,~makeYellow하면서 yellow도 지워지는게 아닌가요?   그냥 커서가 ease박스 안에 있는 상태가 red이니까 red색이 유지가 되는 것 인가요?   왜 빨간색으로 남아있는지 이해가 잘 가지 않습니다ㅠㅠ

pdf 강의북 요청합니다. reu0691@kakao.com

안녕하세요! 강의 재밌게 수강하고 있습니다! 실례가 안 된다면 혹시 선생님께서 말씀하시는 핵심 비즈니스 로직과 화면 혹은 API에 맞춘 로직의 차이점을 간단하게 설명해주실 수 있으실까요? 저는 화면에 출력하거나 API를 만드는 게 곧 핵심 비즈니스 로직이라고 생각했는데 제가 잘못 생각하고 있었던 거 같아 혹시 도움을 받을 수 있을까 하여 질문 남기게 됐습니다 ㅠ + Trade off는 어떤 의미로 이해하면 좋을까요? ㅠㅠ   P.S 비전공자로 여러 강의를 들으면서 선생님 강의 만난 게 최고의 행복인 거 같습니다! 종종 PPL 하시는 JPA 책도 잘 읽고 있는데 언젠가 기회가 되면 선생님께 싸인 받고 싶습니다 ㅋㅋㅋ 존경합니다 선생님!

챕터1에 5번문제를 제출하였는데 채점중에서 넘어가지 않고있습니다. 코드가 잘못된건가요? 확인 좀 부탁드립니다.

- 학습 관련 질문을 남겨주세요. 상세히 작성하면 더 좋아요! - 먼저 유사한 질문이 있었는지 검색해보세요. - 서로 예의를 지키며 존중하는 문화를 만들어가요. - 잠깐! 인프런 서비스 운영 관련 문의는 1:1 문의하기를 이용해주세요.     c#자료구조 강의를 들으면 c++ 강의는 따로 안챙겨봐도 되는지 궁금합니다

function solution(S, T) {   const N = T.length;   let target = S.substr(0, N).split("");   let answer = 0;   let isFlag = true;   let hash = new Map();   for (let x of T) {     if (hash.has(x)) hash.set(x, hash.get(x) + 1);     else hash.set(x, 1);   }   for (let rt = N; rt <= S.length; rt++) {     isFlag = true;     let temp = new Map(Array.from(hash).slice());     for (let x of target) {       if (!temp.has(x) || temp.get(x) === 0) {         isFlag = false;         break;       } else {         temp.set(x, temp.get(x) - 1);       }     }     if (isFlag) answer++;     target.push(S[rt]);     target.shift();   }   return answer; } let a = "bacaAacba"; let b = "abc"; console.log(solution(a, b));

- 학습 관련 질문을 남겨주세요. 상세히 작성하면 더 좋아요! - 먼저 유사한 질문이 있었는지 검색해보세요. - 서로 예의를 지키며 존중하는 문화를 만들어가요. - 잠깐! 인프런 서비스 운영 관련 문의는 1:1 문의하기를 이용해주세요.   안녕하세요! 좋은 강의 감사합니다. function lazyWithPreload(factory) { const Component = React.lazy(factory); Component.preload = factory; return Component; }   혹시 이 코드를 typescript로 바꾸려면 어떻게 해야 할까요? 코드를 이런식으로 바꿨는데 Component에는 preload 속성이 없네요 ㅜㅜ function lazyWithPreload(   factory: () => Promise<{     default: React.ComponentType<any>;   }> ) {   const Component = React.lazy(factory);   Component.preload = factory;   return Component; }    

안녕하세요~! 강의 정말 잘 들었습니다 감사합니다.   지금 결과가 1개로 나오고있는데 혹시 2개 이상으로 나올수가 있을까요~?     답변 부탁드립니다. 감사합니다.

제로초님, 밑에 해진님이 올리신 질문과 같은 상황이 생겨서 코드를 이렇게 바꾸어주니 정상적으로 로딩이 됩니다. 강의대로 하면 에러가 나는 이유가 무엇인가요?> 기존코드 :    고차함수로 바꾸어준 코드

선생님! 제이쿼리는 주석 단축키 입력시 /*  */ 이렇게 나오지 않고  //  이렇게 뜨는데 이유를 알수있을까요?

switch문으로 풀었고 문제에 주어진 예시 입출력은 결과가 똑같이 나오는데 채점사이트에서 채점해보면 오답으로 나오네요.. 제가 뭘 놓친건지 모르겠습니다.   import java.util.*; public class Main { public static void main(String[] args) { Main t = new Main(); Scanner sc = new Scanner(System.in); int N = sc.nextInt(); int[] arrA = new int[N]; for (int i = 0; i < N; i++) { arrA[i] = sc.nextInt(); } int[] arrB = new int[N]; for (int i = 0; i < N; i++) { arrB[i] = sc.nextInt(); } System.out.println(t.solution(N, arrA, arrB)); } public String solution(int N, int[] arrA, int[] arrB) { String answer = ""; for (int i = 0; i < N; i++) { switch (arrA[i] - arrB[i]) { case -1: case 2: { answer += "B"; break; } case 1: case -2: { answer += "A"; break; } case 0: { answer += "D"; break; } } } return answer; } }

안녕하십니까 강사님. 다름아니라 Verilog HDL 부터 FPGA까지 전 강의를 듣고 궁금한 점이 생겨서 연락드립니다.  System IC 설계과정을 봤을 때 저희는 Font-end Design 부분에서   Behavioral Modeling,  RTL level HDL Modeling(Velilog HDL coding),  Functional Simulation(Vivado),  Logic Synthesis(Vitis)   과정을 진행했다고 생각하는데 맞는지 궁금해서 여쭤보고싶습니다.  혹시나 윗부분에서 틀렸다고 생각하시는 부분이나, System IC과정에서 더 포함해야할 부분이 있다면 가르쳐 주시면 감사하겠습니다. 

/hello?username=kim 했을 때 되는 것을 보면 서버가 잘 작동하는 것 같다고 생각됩니다. 그러나 index.html 파일은 열리지가 않습니다. webapp 파일 위치나 오타 등을 모두 확인해 보았는데도 오류를 찾기가 어려웠습니다 ㅠㅠ 영한님이 올려주신 파일로도 해 보았는데, 똑같이 서버는 뜨는 것 같은데 index.html 파일이 열리지 않았습니다. https://drive.google.com/drive/folders/1kydw0oeNz_dZv8w0rFmICk59TKiGpyoh?usp=sharing