Spring Bootアプリケーションの起動時にGson Builderエラーが発生するのはなぜですか？
Eclipseをダウンロードし、スプリングスーツをインストールしました。 spring.ioガイドのいずれかに従って、JPAベースのRestアプリケーションを作成しました。スプリングブートアプリケーションとして実行しようとすると。次のエラーが表示されます。
Java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
このエラーが発生するのはなぜですか？このエラーを修正するにはどうすればよいですか？
コンソールからの完全な出力は次のとおりです。
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.1.RELEASE)
2018-04-25 21:58:28.303 INFO 3574 --- [ main] .m.e.UserProfileEntityServiceApplication : Starting UserProfileEntityServiceApplication on Ajays-MBP.lan with PID 3574 (/Users/ajayamrite/workspaces/meghdoot_spring/UserProfileEntityService/target/classes started by ajayamrite in /Users/ajayamrite/workspaces/meghdoot_spring/UserProfileEntityService)
2018-04-25 21:58:28.306 INFO 3574 --- [ main] .m.e.UserProfileEntityServiceApplication : No active profile set, falling back to default profiles: default
2018-04-25 21:58:28.359 INFO 3574 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3bd40a57: startup date [Wed Apr 25 21:58:28 BST 2018]; root of context hierarchy
2018-04-25 21:58:29.557 INFO 3574 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'httpRequestHandlerAdapter' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration; factoryMethodName=httpRequestHandlerAdapter; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration; factoryMethodName=httpRequestHandlerAdapter; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]]
2018-04-25 21:58:30.142 INFO 3574 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$8d2d15cf] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-04-25 21:58:30.553 INFO 3574 --- [ main] o.s.b.w.embedded.Tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-04-25 21:58:30.612 INFO 3574 --- [ main] o.Apache.catalina.core.StandardService : Starting service [Tomcat]
2018-04-25 21:58:30.612 INFO 3574 --- [ main] org.Apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.29
2018-04-25 21:58:30.617 INFO 3574 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the Java.library.path: [/Users/ajayamrite/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/Java:.]
2018-04-25 21:58:30.716 INFO 3574 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-04-25 21:58:30.716 INFO 3574 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2360 ms
2018-04-25 21:58:30.826 INFO 3574 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-04-25 21:58:30.830 INFO 3574 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-04-25 21:58:30.831 INFO 3574 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-04-25 21:58:30.831 INFO 3574 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-04-25 21:58:30.831 INFO 3574 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-04-25 21:58:31.049 INFO 3574 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
2018-04-25 21:58:31.311 INFO 3574 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-04-25 21:58:31.373 INFO 3574 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
2018-04-25 21:58:31.443 INFO 3574 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Wed Apr 25 21:58:31 BST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
2018-04-25 21:58:31.674 INFO 3574 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.2.16.Final}
2018-04-25 21:58:31.675 INFO 3574 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-04-25 21:58:31.717 INFO 3574 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-04-25 21:58:31.854 INFO 3574 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2018-04-25 21:58:32.718 INFO 3574 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@294aba23'
2018-04-25 21:58:32.722 INFO 3574 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-04-25 21:58:33.709 INFO 3574 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-25 21:58:33.881 INFO 3574 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3bd40a57: startup date [Wed Apr 25 21:58:28 BST 2018]; root of context hierarchy
2018-04-25 21:58:33.917 WARN 3574 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-04-25 21:58:33.947 INFO 3574 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<Java.util.Map<Java.lang.String, Java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-04-25 21:58:33.947 INFO 3574 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-04-25 21:58:33.967 INFO 3574 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-25 21:58:33.967 INFO 3574 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-25 21:58:33.977 INFO 3574 --- [ main] .m.m.a.ExceptionHandlerExceptionResolver : Detected @ExceptionHandler methods in repositoryRestExceptionHandler
2018-04-25 21:58:34.103 WARN 3574 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'gsonBuilder' defined in class path resource [org/springframework/boot/autoconfigure/gson/GsonAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.google.gson.GsonBuilder]: Factory method 'gsonBuilder' threw exception; nested exception is Java.lang.BootstrapMethodError: Java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
2018-04-25 21:58:34.103 INFO 3574 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2018-04-25 21:58:34.105 INFO 3574 --- [ main] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2018-04-25 21:58:34.106 INFO 3574 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2018-04-25 21:58:34.109 INFO 3574 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2018-04-25 21:58:34.110 INFO 3574 --- [ main] o.Apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-04-25 21:58:34.120 INFO 3574 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-04-25 21:58:34.128 ERROR 3574 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'gsonBuilder' defined in class path resource [org/springframework/boot/autoconfigure/gson/GsonAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.google.gson.GsonBuilder]: Factory method 'gsonBuilder' threw exception; nested exception is Java.lang.BootstrapMethodError: Java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.Java:587) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.Java:1250) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.Java:1099) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.Java:541) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.Java:501) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.Java:317) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.Java:228) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.Java:315) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.Java:199) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.Java:760) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.Java:869) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.Java:550) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.Java:140) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.Java:759) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.Java:395) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.Java:327) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.Java:1255) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.Java:1243) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at co.uk.meghdoot.entity.UserProfileEntityServiceApplication.main(UserProfileEntityServiceApplication.Java:12) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.google.gson.GsonBuilder]: Factory method 'gsonBuilder' threw exception; nested exception is Java.lang.BootstrapMethodError: Java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.Java:185) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.Java:579) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
... 18 common frames omitted
Caused by: Java.lang.BootstrapMethodError: Java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
at org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration$StandardGsonBuilderCustomizer.customize(GsonAutoConfiguration.Java:96) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration.lambda$gsonBuilder$0(GsonAutoConfiguration.Java:49) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at Java.util.ArrayList.forEach(ArrayList.Java:1249) ~[na:1.8.0_144]
at org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration.gsonBuilder(GsonAutoConfiguration.Java:49) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration$$EnhancerBySpringCGLIB$$cbe82959.CGLIB$gsonBuilder$1(<generated>) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration$$EnhancerBySpringCGLIB$$cbe82959$$FastClassBySpringCGLIB$$6d1b6b91.invoke(<generated>) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.Java:228) ~[spring-core-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.Java:361) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
at org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration$$EnhancerBySpringCGLIB$$cbe82959.gsonBuilder(<generated>) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at Sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
at Sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:62) ~[na:1.8.0_144]
at Sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:43) ~[na:1.8.0_144]
at Java.lang.reflect.Method.invoke(Method.Java:498) ~[na:1.8.0_144]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.Java:154) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
... 19 common frames omitted
Caused by: Java.lang.NoSuchMethodError: com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
at Java.lang.invoke.MethodHandleNatives.resolve(Native Method) ~[na:1.8.0_144]
at Java.lang.invoke.MemberName$Factory.resolve(MemberName.Java:975) ~[na:1.8.0_144]
at Java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.Java:1000) ~[na:1.8.0_144]
at Java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.Java:1394) ~[na:1.8.0_144]
at Java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.Java:1750) ~[na:1.8.0_144]
at Java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.Java:477) ~[na:1.8.0_144]
... 33 common frames omitted
これをコメントとして書きますが、まだ十分な担当者がいません。
問題は依存関係にある必要があります。ここで起こることは、SpringBootが GsonAutoConfiguration@Configurationクラスをロードし、GsonBuilderのsetLenient()メソッドを呼び出そうとすることです。 SpringBootには、ビルドに自動的に含まれる依存関係として設定された正しいgson jarが既にあります。ただし、gsonへの依存関係を明示的に指定すると、SpringBootによってもたらされる依存関係がオーバーライドされます。使用しているgsonのバージョンには、setLenient()がまだ存在しなかったようです。
あなたができる最善の方法は、pom.xml（またはbuild.gradle、またはあなたが使用する他のもの）からgsonへの明示的な依存関係を削除するか、使用しているSpringBootバージョンで期待されるものと一致するように更新することです。
SpringBootの最新バージョンを使用している場合、これはgsonの最新バージョンです。
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.2</version>
</dependency>
編集：ビルドでgsonを明示的に宣言していなくても、依存関係の別のものが古いバージョンを使用しており、SpringBootが期待するバージョンを上書きする可能性があります。その場合、問題を総当たりするのではなく、すべての依存関係を調べて、バージョンが揃っていることを確認することをお勧めします。 Maven Central にリストされている依存関係とそのバージョンを確認することをお勧めします。
私は同じ問題に直面し、これを修正しようとして多くの時間を無駄にしなければなりませんでした。
この問題は、Spring Bootのデフォルトの依存関係と既にプロジェクトに含まれている既存の依存関係のGsonライブラリのバージョンが一致しないために発生します。
この問題の最も簡単な解決策（私にとってはうまくいきました）は、発生するたびに置き換えることです
@EnableAutoConfiguration
タグ付け
@EnableAutoConfiguration(exclude = {org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration.class})
これは基本的に、Gsonの自動構成をスキップするようにSpringブートアプリケーションに指示します。
この解決策は、同じ問題を引き起こす可能性のある他のクラスにも適用されます。競合する各クラスの名前をEnableAutoConfigurationのexclude属性に追加するだけです。
この問題は、Springが「AutoConfiguration」をトリガーする方法に関連していると思います。この場合、@ ConditionalOnClass（value = Gson.class）アノテーションがあるため、使用していない場合でも、com.google.gson.Gson.classが存在すると「GsonAutoConfiguration」がトリガーされます。
したがって、解決策は、Gsonクラスを持つ依存関係を削除するか、特定の「AutoConfiguration」を削除することです。
@EnableAutoConfiguration（exclude = {org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration.class}）
OK、私が直面している同じ問題、問題はスプリングブートとgsonのバージョンの不一致が原因です...ソリューションはバージョンを削除します
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<Java.version>1.8</Java.version>
</properties>
<dependencies>
<!-- Gson dependency -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>