큰 기업이라면 sql 서버에 지속적으로 데이터를 요청하는것보다 그냥 c나 c++로 custom db를 사내에 만들어서 관리하는것이 (기능은 더 적더라도) 노력은 들지만 한번 만들어 놓으면 더 빠르고 관리하기 편할 것 같다는 생각이 드는데  실제 현업에서 이러한 사례가 있는지, 없다면 이유가 있나요? (그냥 구현하기가 그만큼 어려워서인가요?) 자체적으로 게임엔진을 만드는 회사들도 있는데 자체 db를 만드는 회사는 없나 갑자기 궁금해져서 여쭤봅니다.  

> Task :compileJava UP-TO-DATE > Task :processResources UP-TO-DATE > Task :classes UP-TO-DATE > Task :compileTestJava > Task :processTestResources NO-SOURCE > Task :testClasses > Task :test 20:26:51.469 [Test worker] DEBUG org.springframework.test.context.BootstrapUtils - Instantiating CacheAwareContextLoaderDelegate from class [org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate] 20:26:51.489 [Test worker] DEBUG org.springframework.test.context.BootstrapUtils - Instantiating BootstrapContext using constructor [public org.springframework.test.context.support.DefaultBootstrapContext(java.lang.Class,org.springframework.test.context.CacheAwareContextLoaderDelegate)] 20:26:51.548 [Test worker] DEBUG org.springframework.test.context.BootstrapUtils - Instantiating TestContextBootstrapper for test class [hello1.hellospring1.service.MemberServiceIntegrationTest] from class [org.springframework.boot.test.context.SpringBootTestContextBootstrapper] 20:26:51.562 [Test worker] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Neither @ContextConfiguration nor @ContextHierarchy found for test class [hello1.hellospring1.service.MemberServiceIntegrationTest], using SpringBootContextLoader 20:26:51.568 [Test worker] DEBUG org.springframework.test.context.support.AbstractContextLoader - Did not detect default resource location for test class [hello1.hellospring1.service.MemberServiceIntegrationTest]: class path resource [hello1/hellospring1/service/MemberServiceIntegrationTest-context.xml] does not exist 20:26:51.568 [Test worker] DEBUG org.springframework.test.context.support.AbstractContextLoader - Did not detect default resource location for test class [hello1.hellospring1.service.MemberServiceIntegrationTest]: class path resource [hello1/hellospring1/service/MemberServiceIntegrationTestContext.groovy] does not exist 20:26:51.568 [Test worker] INFO org.springframework.test.context.support.AbstractContextLoader - Could not detect default resource locations for test class [hello1.hellospring1.service.MemberServiceIntegrationTest]: no resource found for suffixes {-context.xml, Context.groovy}. 20:26:51.569 [Test worker] INFO org.springframework.test.context.support.AnnotationConfigContextLoaderUtils - Could not detect default configuration classes for test class [hello1.hellospring1.service.MemberServiceIntegrationTest]: MemberServiceIntegrationTest does not declare any static, non-private, non-final, nested classes annotated with @Configuration. 20:26:51.628 [Test worker] DEBUG org.springframework.test.context.support.ActiveProfilesUtils - Could not find an 'annotation declaring class' for annotation type [org.springframework.test.context.ActiveProfiles] and class [hello1.hellospring1.service.MemberServiceIntegrationTest] 20:26:51.731 [Test worker] DEBUG org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider - Identified candidate component class: file [C:\Users\tjd57\study\hello-spring1\build\classes\java\main\hello1\hellospring1\HelloSpring1Application.class] 20:26:51.737 [Test worker] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Found @SpringBootConfiguration hello1.hellospring1.HelloSpring1Application for test class hello1.hellospring1.service.MemberServiceIntegrationTest 20:26:51.853 [Test worker] DEBUG org.springframework.boot.test.context.SpringBootTestContextBootstrapper - @TestExecutionListeners is not present for class [hello1.hellospring1.service.MemberServiceIntegrationTest]: using defaults. 20:26:51.854 [Test worker] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.boot.test.autoconfigure.restdocs.RestDocsTestExecutionListener, org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerResetTestExecutionListener, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcPrintOnlyOnFailureTestExecutionListener, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverTestExecutionListener, org.springframework.boot.test.autoconfigure.webservices.client.MockWebServiceServerTestExecutionListener, org.springframework.boot.test.mock.mockito.MockitoTestExecutionListener, org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener, org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.event.ApplicationEventsTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener, org.springframework.test.context.event.EventPublishingTestExecutionListener] 20:26:51.869 [Test worker] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@5bf22f18, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@267f474e, org.springframework.test.context.event.ApplicationEventsTestExecutionListener@7a7471ce, org.springframework.boot.test.mock.mockito.MockitoTestExecutionListener@28276e50, org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener@62e70ea3, org.springframework.test.context.support.DirtiesContextTestExecutionListener@3efe7086, org.springframework.test.context.transaction.TransactionalTestExecutionListener@675d8c96, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener@741b3bc3, org.springframework.test.context.event.EventPublishingTestExecutionListener@2ed3b1f5, org.springframework.boot.test.autoconfigure.restdocs.RestDocsTestExecutionListener@63648ee9, org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerResetTestExecutionListener@68d6972f, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcPrintOnlyOnFailureTestExecutionListener@45be7cd5, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverTestExecutionListener@7651218e, org.springframework.boot.test.autoconfigure.webservices.client.MockWebServiceServerTestExecutionListener@3185fa6b, org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener@6d366c9b] 20:26:51.874 [Test worker] DEBUG org.springframework.test.context.support.AbstractDirtiesContextTestExecutionListener - Before test class: context [DefaultTestContext@d5ae57e testClass = MemberServiceIntegrationTest, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@68759011 testClass = MemberServiceIntegrationTest, locations = '{}', classes = '{class hello1.hellospring1.HelloSpring1Application}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer@1921ad94, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@53fd0d10, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@1fde5d22, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@16ce702d, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@2f1de2d6, org.springframework.boot.test.context.SpringBootTestArgs@1, org.springframework.boot.test.context.SpringBootTestWebEnvironment@29d89d5d], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true]], class annotated with @DirtiesContext [false] with mode [null]. . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.6.6) 2022-05-01 20:26:52.231 INFO 17296 --- [ Test worker] h.h.s.MemberServiceIntegrationTest : Starting MemberServiceIntegrationTest using Java 17.0.1 on LAPTOP-LEVUU8B0 with PID 17296 (started by tjd57 in C:\Users\tjd57\study\hello-spring1) 2022-05-01 20:26:52.233 INFO 17296 --- [ Test worker] h.h.s.MemberServiceIntegrationTest : No active profile set, falling back to 1 default profile: "default" 2022-05-01 20:26:53.722 INFO 17296 --- [ Test worker] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: class path resource [static/index.html] 2022-05-01 20:26:54.073 INFO 17296 --- [ Test worker] h.h.s.MemberServiceIntegrationTest : Started MemberServiceIntegrationTest in 2.157 seconds (JVM running for 4.025) 2022-05-01 20:26:54.113 INFO 17296 --- [ Test worker] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2022-05-01 20:26:54.174 INFO 17296 --- [ Test worker] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed. 2022-05-01 20:26:54.180 INFO 17296 --- [ Test worker] o.s.t.c.transaction.TransactionContext : Began transaction (1) for test context [DefaultTestContext@d5ae57e testClass = MemberServiceIntegrationTest, testInstance = hello1.hellospring1.service.MemberServiceIntegrationTest@5f8a02cf, testMethod = 중복_회원_예외@MemberServiceIntegrationTest, testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@68759011 testClass = MemberServiceIntegrationTest, locations = '{}', classes = '{class hello1.hellospring1.HelloSpring1Application}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer@1921ad94, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@53fd0d10, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@1fde5d22, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@16ce702d, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@2f1de2d6, org.springframework.boot.test.context.SpringBootTestArgs@1, org.springframework.boot.test.context.SpringBootTestWebEnvironment@29d89d5d], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true, 'org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]]; transaction manager [org.springframework.jdbc.support.JdbcTransactionManager@26d5a317]; rollback [true] 2022-05-01 20:26:54.917 INFO 17296 --- [ Test worker] o.s.t.c.transaction.TransactionContext : Rolled back transaction for test: [DefaultTestContext@d5ae57e testClass = MemberServiceIntegrationTest, testInstance = hello1.hellospring1.service.MemberServiceIntegrationTest@5f8a02cf, testMethod = 중복_회원_예외@MemberServiceIntegrationTest, testException = org.opentest4j.AssertionFailedError: expected: "이미 존재하는 회원입니다." but was: "이미 존재하는 회원입니다. ", mergedContextConfiguration = [WebMergedContextConfiguration@68759011 testClass = MemberServiceIntegrationTest, locations = '{}', classes = '{class hello1.hellospring1.HelloSpring1Application}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer@1921ad94, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@53fd0d10, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@1fde5d22, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@16ce702d, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@2f1de2d6, org.springframework.boot.test.context.SpringBootTestArgs@1, org.springframework.boot.test.context.SpringBootTestWebEnvironment@29d89d5d], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true, 'org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]] expected: "이미 존재하는 회원입니다." but was: "이미 존재하는 회원입니다. " org.opentest4j.AssertionFailedError: expected: "이미 존재하는 회원입니다." but was: "이미 존재하는 회원입니다. " at java.base@17.0.1/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base@17.0.1/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) at java.base@17.0.1/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base@17.0.1/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) at app//hello1.hellospring1.service.MemberServiceIntegrationTest.중복_회원_예외(MemberServiceIntegrationTest.java:53) at java.base@17.0.1/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base@17.0.1/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base@17.0.1/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base@17.0.1/java.lang.reflect.Method.invoke(Method.java:568) at app//org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725) at app//org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60) at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131) at app//org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149) at app//org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140) at app//org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84) at app//org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115) at app//org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105) at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106) at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64) at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45) at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37) at app//org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104) at app//org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98) at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:214) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:210) at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:135) at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:66) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) at app//org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) at java.base@17.0.1/java.util.ArrayList.forEach(ArrayList.java:1511) at app//org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) at app//org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) at java.base@17.0.1/java.util.ArrayList.forEach(ArrayList.java:1511) at app//org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) at app//org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) at app//org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35) at app//org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at app//org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75) at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:99) at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:79) at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75) at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61) at java.base@17.0.1/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base@17.0.1/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base@17.0.1/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base@17.0.1/java.lang.reflect.Method.invoke(Method.java:568) at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36) at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33) at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94) at jdk.proxy1/jdk.proxy1.$Proxy2.stop(Unknown Source) at org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run(TestWorker.java:193) at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129) at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100) at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60) at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56) at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133) at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71) at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69) at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74) 2022-05-01 20:26:54.928 INFO 17296 --- [ Test worker] o.s.t.c.transaction.TransactionContext : Began transaction (1) for test context [DefaultTestContext@d5ae57e testClass = MemberServiceIntegrationTest, testInstance = hello1.hellospring1.service.MemberServiceIntegrationTest@5e51ec2e, testMethod = 회원가입@MemberServiceIntegrationTest, testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@68759011 testClass = MemberServiceIntegrationTest, locations = '{}', classes = '{class hello1.hellospring1.HelloSpring1Application}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer@1921ad94, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@53fd0d10, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@1fde5d22, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@16ce702d, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@2f1de2d6, org.springframework.boot.test.context.SpringBootTestArgs@1, org.springframework.boot.test.context.SpringBootTestWebEnvironment@29d89d5d], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true, 'org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]]; transaction manager [org.springframework.jdbc.support.JdbcTransactionManager@26d5a317]; rollback [true] 2022-05-01 20:26:54.953 INFO 17296 --- [ Test worker] o.s.t.c.transaction.TransactionContext : Rolled back transaction for test: [DefaultTestContext@d5ae57e testClass = MemberServiceIntegrationTest, testInstance = hello1.hellospring1.service.MemberServiceIntegrationTest@5e51ec2e, testMethod = 회원가입@MemberServiceIntegrationTest, testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@68759011 testClass = MemberServiceIntegrationTest, locations = '{}', classes = '{class hello1.hellospring1.HelloSpring1Application}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer@1921ad94, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@53fd0d10, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@1fde5d22, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@16ce702d, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@2f1de2d6, org.springframework.boot.test.context.SpringBootTestArgs@1, org.springframework.boot.test.context.SpringBootTestWebEnvironment@29d89d5d], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true, 'org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]] MemberServiceIntegrationTest > �ߺ�_ȸ��_����() FAILED org.opentest4j.AssertionFailedError at MemberServiceIntegrationTest.java:53 2022-05-01 20:26:54.989 INFO 17296 --- [ionShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated... 2022-05-01 20:26:55.004 INFO 17296 --- [ionShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed. 2 tests completed, 1 failed > Task :test FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':test'. > There were failing tests. See the report at: file:///C:/Users/tjd57/study/hello-spring1/build/reports/tests/test/index.html * Try: > Run with --stacktrace option to get the stack trace. > Run with --info or --debug option to get more log output. > Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 6s 4 actionable tasks: 2 executed, 2 up-to-date [질문 내용]이미 존재하는 회원이라는 오류가 뜨고있습니다 , 어떻게 해결해야 좋을까요??

에러로그   sudo vi /etc/nginx/nginx.conf    sudo vi /etc/nginx/sites-enabled/default    서버를 구동하고 AWS Public IP로 접속하려고 해도 접속이 안됩니다 ,,, 어떻게 해야할까요  

문제 1, 2, 3 은 교수님이 풀어주신 예제의 변형 문제입니다. 교수님의 예제 출력값 1   1  2   1  2  3   1  2  3  4   1  2  3  4  5  ----------------------------------------------------------------------------------------------------------------------------- 1. 원하는 출력값 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1   #include <iostream> using namespace std; int main() { int outer_count = 5; while(outer_count >= 0) { int inner_count = 1; while(outer_count >= inner_count) { cout << inner_count++ << " "; } cout << endl; --outer_count; }   return 0; } ----------------------------------------------------------------------------------------------------------------------------- 2. 원하는 출력값 5 4 3 2 1 5 4 3 2 5 4 3 5 4 5   #include <iostream> using namespace std; int main() { int outer = 1; while(outer <= 5) { int inner = 5; while(outer <= inner) { cout << inner << " "; --inner; }   cout << endl; ++outer; } return 0; } ----------------------------------------------------------------------------------------------------------------------------- 3. 원하는 출력값 1 2 3 4 5 X 1 2 3 4 X 1 2 3 X 1 2 X 1 X   #include <iostream> using namespace std; int main() { int outer = 5;   while(outer >= 0) { int inner = 1;   while(outer >= inner) { cout << inner << " "; inner++; if(outer < inner) cout << "X"; } cout << endl; outer--; } return 0; } ----------------------------------------------------------------------------------------------------------------------------- 4. 구구단 프로그램   #include <iostream> using namespace std; int main() { int x; cin >> x; int y = 1;   while(y <= 9) { cout << x << "*" << y << "=" << x*y << endl; y++; } return 0; }    

Build 하고 아래 경고가 나옵니다. 무시해되 되는지요? Warning: Unable to find player assembly: C:\Unity\EntityComponentSystemSamples\ECSSamples\Temp\StagingArea\Data\Managed\UnityEngine.TestRunner.dll

에러로그       sudo vi /etc/nginx/nginx.conf    sudo vi /etc/nginx/sites-enabled/default  서버를 구동하고 AWS Public IP로 접속하려고 해도 접속이 안됩니다 ,,, 어떻게 해야할까요

안녕하세요. 저는 아래와 같이 쿼리를 짜보았는데요.   SELECT DISTINCT(CITY)FROM STATIONWHERE city NOT LIKE '[AEIOU]%' OR city NOT LIKE '%[AEIOU]';   해커랭크에서도 위의 쿼리는 Wrong Answer로 나오기는 하지만 아웃풋 자체는 정답과 같은 거 같은데 - 이 쿼리 방법은 틀린 걸까요?    

유니티 버전을 2021.3.1f1 (lts) 를 사용해도 되는지요?

B tree index의 이해 강좌 마지막 부분 ppt에서 ROWID가 ACER인 ROW가 복수개의 데이터 파일에 존재합니다. ROWID는 유니크한 것으로 알고 있었는데, 실제로 저런 케이스가 존재 가능한가요??

수업자료와 수업노트 다운로드 어디서 하나요?

강사님 안녕하세요? 강의 정말 잘 듣고 많은 것을 배웠습니다. 현재 저는 ASIC 계열에서 프론트엔드 업무를 하고 있습니다.  synthesis 부터 sta, ec 등 작업을 하던 중 설계에 관해서 많은 관심이 생겼습니다.   막연하게 설계를 해보고싶다! 이런 것은 아니고 rtl이 주로 system verilog로 되어서 받는데, 혼자서 해석하기가 난해하더군요.. 그래서 system verilog 문법이나 강좌를 따로 들을 수 있는 곳이 있을까요??   아니면 어떤 식으로 공부를 해야할 지 어렵습니다.

학습하는 분들께 도움이 되고, 더 좋은 답변을 드릴 수 있도록 질문전에 다음을 꼭 확인해주세요.1. 강의 내용과 관련된 질문을 남겨주세요.2. 인프런의 질문 게시판과 자주 하는 질문(링크)을 먼저 확인해주세요.(자주 하는 질문 링크: https://bit.ly/3fX6ygx)3. 질문 잘하기 메뉴얼(링크)을 먼저 읽어주세요.(질문 잘하기 메뉴얼 링크: https://bit.ly/2UfeqCG)질문 시에는 위 내용은 삭제하고 다음 내용을 남겨주세요.=========================================[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]딱히 수업내용과 상관없긴한데 id 'org.springframework.boot' version ‘2.2.2.RELEASE' 요 부분이 오타입니다. 뭐 어차피 스프링 부트가 만들어준 그대로 사용하기 때문에 크게 상관없을 것 같긴한데 플러그인 내용들을 전부 복사하는 경우 문제가 발생할것 같아 제보합니다. 해 당내용 : queryDsl => Gradle 전체 설정 plugins {id 'org.springframework.boot' version ‘2.2.2.RELEASE'id 'io.spring.dependency-management' version '1.0.8.RELEASE' id 'java' }

  어쩌다 R프로그램을 지우고 새로 설치하게되었는데 사용자계정이 한글이여서 package 설치가 안됩니다. 이전까지 잘쓰다가 이번에 새로 깔았더니 경로가 다 날아갔는지 초기화되었는데 하루종일 붙잡고 있어도 해결이 안되요 도와주세요ㅠㅠ   R과 Rstudio는 D드라이브에 설치했고 onedrive, 백신프로그램 다끄고 관리자 권한으로 실행도 다 해봤습니다. 설치경로, 지정경로에도 한글없도록 폴더를 만들어줬는데 도대체 뭐가 문제인걸까요!! 그리고 "다운로드된 바이너리 패키지들은 다음의 위치에 있습니다" 이건 왜 C드라이브로 가는지 정말 모르겠습니다ㅠㅠ   오류코드입니다.     > install.packages("data.table") Error in install.packages : Updating loaded packages Restarting R session... Warning message: In normalizePath(path.expand(path), winslash, mustWork) : path[1]="C:/Users/???/Documents": 파일 이름, 디렉터리 이름 또는 볼륨 레이블 구문이 잘못되었습니다 Warning message: In normalizePath(path.expand(path), winslash, mustWork) : path[1]="C:/Users/???/Documents": 파일 이름, 디렉터리 이름 또는 볼륨 레이블 구문이 잘못되었습니다 Warning message: In normalizePath(path.expand(path), winslash, mustWork) : path[1]="C:/Users/???/Documents": 파일 이름, 디렉터리 이름 또는 볼륨 레이블 구문이 잘못되었습니다 Warning message: In normalizePath(path.expand(path), winslash, mustWork) : path[1]="C:/Users/???/Documents": 파일 이름, 디렉터리 이름 또는 볼륨 레이블 구문이 잘못되었습니다 > install.packages("data.table") WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding: https://cran.rstudio.com/bin/windows/Rtools/ trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.2/data.table_1.14.2.zip' Content type 'application/zip' length 2240158 bytes (2.1 MB) downloaded 2.1 MB 패키지 ‘data.table’를 성공적으로 압축해제하였고 MD5 sums 이 확인되었습니다 다운로드된 바이너리 패키지들은 다음의 위치에 있습니다 C:\Windows\Temp\RtmpgvLOHC\downloaded_packages       > library(data.table) data.table 1.14.2 using 3 threads (see ?getDTthreads). Latest news: r-datatable.com Warning messages: 1: In normalizePath(path.expand(path), winslash, mustWork) : path[1]="C:/Users/???/Documents": 파일 이름, 디렉터리 이름 또는 볼륨 레이블 구문이 잘못되었습니다 2: In normalizePath(path.expand(path), winslash, mustWork) : path[1]="C:/Users/???/Documents": 파일 이름, 디렉터리 이름 또는 볼륨 레이블 구문이 잘못되었습니다  

warped = cv2.warpAffine(image_origin, metrix, (image_width, image_height),         flags=cv2.INTER_CUBIC) 이 부분에서 계속 center에 관한 에러가 발생합니다. 따로 코드를 건들이지 않고 실행만 시켰습니다.

mobaxterm 설치 후(로그인 안했는데 자동으로 된거같아요)   wsl-ubuntu랑  wsl-ubuntu20.04 두개가 나오잖아요     근데 아래껀 영상대로 잘 되는데   위에껀 오류가  뜨네요    어떻게 아래꺼로 따라해서 설치(GUI로)를 잘 하긴 했는데(울트라 다 뺏는데 50기가라서 놀랐습니다)   혹시 이 오류로 추후에 문제가 생기려나 싶어 여쭤봅니다

안녕하세요! config-service에 rabbitmq 설정 정보를 추가하고 실행시켜 보니 다음과 같은 에러가 뜨며 Rabbit health check failed라고 나오는데 몇시간 동안 찾아봐도 해결이 안되서 질문 드립니다ㅠㅠ       Caused by: java.io.IOException: null at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:129) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:125) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:147) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:439) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1225) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1173) ~[amqp-client-5.13.1.jar:5.13.1] at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.connectAddresses(AbstractConnectionFactory.java:640) ~[spring-rabbit-2.4.2.jar:2.4.2] at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.connect(AbstractConnectionFactory.java:615) ~[spring-rabbit-2.4.2.jar:2.4.2] at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.createBareConnection(AbstractConnectionFactory.java:565) ~[spring-rabbit-2.4.2.jar:2.4.2] ... 49 common frames omitted Caused by: com.rabbitmq.client.ShutdownSignalException: connection error; protocol method: #method<connection.close>(reply-code=541, reply-text=INTERNAL_ERROR - access to vhost '/' refused for user 'jjh': vhost '/' is down, class-id=10, method-id=40) at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:66) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:36) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:502) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:293) ~[amqp-client-5.13.1.jar:5.13.1] at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:141) ~[amqp-client-5.13.1.jar:5.13.1]   ... 55 common frames omitted       계정 문제인것 같아서, 새로 유저 추가 및 권한 설정 하고 vhost도 추가해줬는데도 같은 에러가 나옵니다. 웹페이지에서 보면 stopped 되었다고 나오는데 이부분이 문제인 걸까요??   또한, sudo rabbitmqctl reset, stop_app 등 명령어를 실행하면 다음과 같은 에러가 나오는데 이유를 모르겠습니다     Error: unable to perform an operation on node 'rabbit@localhost'. Please see diagnostics information and suggestions below.   Most common reasons for this are:    * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)  * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)  * Target node is not running   In addition to the diagnostics info below:    * See the CLI, clustering and networking guides on https://rabbitmq.com/documentation.html to learn more  * Consult server logs on node rabbit@localhost  * If target node is configured to use long node names, don't forget to use --longnames with CLI tools   DIAGNOSTICS ===========   attempted to contact: [rabbit@localhost]   rabbit@localhost:   * connected to epmd (port 4369) on localhost   * epmd reports: node 'rabbit' not running at all                   no other nodes on localhost   * suggestion: start the node   Current node details:      

2분 6초부분 \t 가아닌 저는 원화문자t로 표시가 됩니다.. 이거 왜이럴까요?  

소멸 지정자를 만들어주지 않으면 빈은 삭제 되지 않나요?

SocketAsyncEventArgs의 Completed eventHandler가 소켓의 AcceptAsync함수가 이후에 완료되면 (pending == true) threadPool에서 하나의 작업쓰레드를 가져와서 해당 이벤트를 처리하는것 같습니다.  그래서 서버를 돌리다가 중단을 하면 작업쓰레드가 많이 생성되는것이 보입니다.  그렇게 생성되는 작업쓰레드는 Session을 생성하고 거의 곧바로 완료가 되어서인지 중단을 해보면 쓰레드가 실행중인 코드를 찾을수가 없다고 나옵니다 (아마 해당 쓰레드는  제가 작성한 코드를 실행하고 있는것이 아니라 디버깅을 할 수 없는 부분의 더 낮은(?) 부분의 일을 하고 있거나 이미 자신의 일을 다 하고 다시 threadPool로 들어가고 있기 때문이라고 생각했습니다.)  어찌되었든 소켓통신이 발생될때마다 쓰레드가 마구잡이로 동원되는것이 맘에 들지 않아서 socket 에 관한 async 함수의 완료 이벤트만 담당하여 수행하는 쓰레드를 만들어 따로 관리를 하려고 했습니다. (궁극적인 목표는 서버나 클라이언트에서 코어 *2의 쓰레드를 미리 만들어놓고 해당쓰레드 이외의 다른 쓰레드는 생성하지 않는 것입니다.) 그러나 기존의 방법으로는 pending이 일어나고 나중에 이벤트가 호출이 될 때 호출되는 쓰레드를 미리 정하는 방법이 있는지 잘 모르겠습니다. 다른방법이 있는지 고민하고있는데 적절한 답이 떠오르지 않아 이렇게 질문드립니다. 감사합니다.

제가 위 사진같이 실수로 MakeDict함수안에 dict를 만들때, public을 안빼고 넣어서 계속 오류가 뜨던데 public이 있으면 왜 안되는건지 문법적으로 궁금합니다!