2016-04-18 22 views
5

Sto usando com.fasterxml.jackson.core:jackson-annotations:2.6.0 nel mio progetto gradle. Da quando ho aggiunto com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.6.0 al mio file di costruzione del progetto ho ricevuto questa eccezione mentre eseguivo il mio progetto gradle. Ecco la traccia dello stack del mio errore.

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: com.fasterxml.jackson.annotation.JsonFormat$Value.empty()Lcom/fasterxml/jackson/annotation/JsonFormat$Value; at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098) ... 117 more Caused by: java.lang.NoSuchMethodError: com.fasterxml.jackson.annotation.JsonFormat$Value.empty()Lcom/fasterxml/jackson/annotation/JsonFormat$Value; at com.fasterxml.jackson.databind.cfg.MapperConfig.(MapperConfig.java:50) at com.fasterxml.jackson.databind.ObjectMapper.(ObjectMapper.java:535) at com.fasterxml.jackson.databind.ObjectMapper.(ObjectMapper.java:452) at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.build(Jackson2ObjectMapperBuilder.java:553) at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.(MappingJackson2HttpMessageConverter.java:57) at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.(AllEncompassingFormHttpMessageConverter.java:61) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.(RequestMappingHandlerAdapter.java:187) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:422) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147) ... 119 more Nested in org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: com.fasterxml.jackson.annotation.JsonFormat$Value.empty()Lcom/fasterxml/jackson/annotation/JsonFormat$Value;: java.lang.NoSuchMethodError: com.fasterxml.jackson.annotation.JsonFormat$Value.empty()Lcom/fasterxml/jackson/annotation/JsonFormat$Value; at com.fasterxml.jackson.databind.cfg.MapperConfig.(MapperConfig.java:50) at com.fasterxml.jackson.databind.ObjectMapper.(ObjectMapper.java:535) at com.fasterxml.jackson.databind.ObjectMapper.(ObjectMapper.java:452) at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.build(Jackson2ObjectMapperBuilder.java:553) at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.(MappingJackson2HttpMessageConverter.java:57) at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.(AllEncompassingFormHttpMessageConverter.java:61) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.(RequestMappingHandlerAdapter.java:187) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:422) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:548) at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1272) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:489) at org.gradle.api.plugins.jetty.internal.JettyPluginWebAppContext.doStart(JettyPluginWebAppContext.java:112) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:224) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.gradle.api.plugins.jetty.internal.Jetty6PluginServer.start(Jetty6PluginServer.java:111) at org.gradle.api.plugins.jetty.AbstractJettyRunTask.startJettyInternal(AbstractJettyRunTask.java:238) at org.gradle.api.plugins.jetty.AbstractJettyRunTask.startJetty(AbstractJettyRunTask.java:191) at org.gradle.api.plugins.jetty.AbstractJettyRunTask.start(AbstractJettyRunTask.java:162) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:227) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:220) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:209) at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:585) at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:568) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46) at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53) at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185) at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66) at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110) at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23) at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43) at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30) at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:154) at org.gradle.internal.Factories$1.create(Factories.java:22) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:52) at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:151) at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32) at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:99) at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:93) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62) at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:93) at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:82) at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:94) at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:46) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.tooling.internal.provider.runner.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:58) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28) at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:75) at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:45) at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:52) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72) at org.gradle.util.Swapper.swap(Swapper.java:38) at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:47) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:66) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:72) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50) at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:246) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54) at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

non ho utilizzato utilizzato @JsonFormat nella mia classe. Ma ho le annotazioni JsonSerializer e JsonDeserializer utilizzando due classi per serializzare e deserializzare il mio ZonedDateTime da e verso Json in UTC. Sto facendo questa serializzazione e deserializzazione per la prima volta, quindi per favore dai qualche suggerimento.

Ecco il mio codice del file Gradle:

apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'jetty' apply plugin: 'maven' apply plugin: 'war' 

ext { springVersion = "4.2.4.RELEASE" springSecurityVersion = "4.0.3.RELEASE" } 

repositories {  mavenLocal() mavenCentral() 
    /* maven { 
     url "http://repo.typesafe.com/typesafe/releases/" 
    } */ } 

configurations.all { exclude group: "commons-logging", module: "commons-logging" exclude group: "log4j", module: "log4j" } 

dependencies { compile 'org.slf4j:jcl-over-slf4j:1.7.12' compile 'ch.qos.logback:logback-classic:1.1.3' compile "org.springframework:spring-core:$springVersion" compile "org.springframework:spring-context:$springVersion" 
     compile ("org.springframework:spring-web:$springVersion"){ 
     exclude group: "com.fasterxml.jackson.core" } compile ("org.springframework:spring-webmvc:$springVersion"){ 
     exclude group: "com.fasterxml.jackson.core" } compile "org.springframework:spring-orm:$springVersion" compile "org.springframework.security:spring-security-web:$springSecurityVersion" compile "org.springframework.security:spring-security-config:$springSecurityVersion" 
     compile "org.aspectj:aspectjrt:1.7.4" 

    compile "org.hibernate:hibernate-core:4.3.6.Final"  compile "org.hibernate:hibernate-entitymanager:4.3.6.Final" compile "javax.servlet:javax.servlet-api:3.1.0" compile "org.javassist:javassist:3.15.0-GA" compile "mysql:mysql-connector-java:5.1.31" 
     compile "org.hsqldb:hsqldb:2.3.2" 
     compile "commons-dbcp:commons-dbcp:1.2.2" compile "org.apache.commons:commons-lang3:3.4"  compile 'com.fasterxml.jackson.core:jackson-annotations:2.7.0' compile 'com.fasterxml.jackson.core:jackson-core:2.7.0' compile 'com.fasterxml.jackson.core:jackson-databind:2.7.0' compile 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.7.0' 

     compile "net.sf.ehcache:ehcache-core:2.6.9" compile "org.hibernate:hibernate-ehcache:4.3.5.Final" compile "com.h2database:h2:1.4.177" compile "com.google.code.gson:gson:2.6.2" 
     testCompile ("junit:junit:4.12"){ 
     exclude group: "org.hamcrest" } testCompile "org.springframework:spring-test:$springVersion" testCompile "org.easetech:easytest-core:1.4.0" testCompile "org.mockito:mockito-core:1.9.5" testCompile "org.hamcrest:hamcrest-all:1.3" testCompile "com.jayway.jsonpath:json-path:2.2.0" testCompile "com.jayway.jsonpath:json-path-assert:2.2.0" 
     testRuntime "org.hsqldb:hsqldb:2.3.2" } 
+1

se si utilizza webmvc molla non è necessario aggiungere nuovamente la dipendenza di jackson, spring mvc ha già i jar di jackson core – Priyamal

+0

hi priyamal, in realtà se uso la dipendenza di jackson all'interno del mvc di primavera o del webmvc di primavera, allora potrei avere la possibilità di incorrere in un problema con lo stesso errore che sto affrontando ora .. JsonFormat.Value.empty() metodo non trovato coz questo particolare metodo è definito per le versioni 2.7 e successive. Ecco perché ho effettivamente escluso il barattolo di jackson all'interno del mvc e del webmvc a molla e li ho definiti manualmente. –

risposta

2

Ho risolto il problema quando ho appena provato a eseguire l'attività - gradle clean. Penso che alcune vecchie dipendenze del progetto si siano protratte fino ad ora. Era solo una questione di pulizia del progetto. Il progetto funziona bene ora. :)

11

Controllare le dipendenze del progetto. Potresti utilizzare versioni di librerie incompatibili. La versione 2.7 ha il metodo empty() e la versione 2.6 no.

http://fasterxml.github.io/jackson-annotations/javadoc/2.6/com/fasterxml/jackson/annotation/JsonFormat.Value.html

http://fasterxml.github.io/jackson-annotations/javadoc/2.7.0-rc1/com/fasterxml/jackson/annotation/JsonFormat.Value.html

tenta l'aggiornamento alla versione 2.7.

+0

Ciao, Benat In realtà ho provato a farlo anche tu..Aggiornamento alla versione 2.7 ma ancora sto affrontando lo stesso problema.Ora ho cercato di escludere le dipendenze di jackson all'interno di altre importanti dipendenze primaverili come le dipendenze di spring-web e spring-webmvc. Anche dopo che sto avendo lo stesso problema. –

+1

Controlla se il file WAR che stai costruendo ha le librerie che ti aspetti di avere. –

+0

ya il mio file WAR ha anche dipendenze di jackson della versione 2.7 ... ancora lo stesso problema –

0

Questa è una soluzione alternativa a quelle già fornite da @ BeñatBermejo e @AkashRaveendran sopra. Sono felice che Akash sia riuscito a far funzionare il suo sistema semplicemente ripulendo il suo ambiente, ma nel mio caso l'ho trovato insufficiente.

L'errore veniva dal database di jackson, che avevo nel mio pom come versione 2.8.1. Tuttavia, dato che ho coinvolto anche Spring, le dipendenze del database di jackson, ovvero jackson-core, erano ancora a 2.6.6.

Tutto quello che dovevo fare era rimuovere lo specificatore di versione nella mia dipendenza dal database di jackson. Quando l'ho fatto, Maven ha usato invece la versione chiamata Spring, 2.6.6, che non includeva la chiamata a JsonFormat $ Value.empty().

Se hai bisogno di alcune funzionalità di jackson 2.7+, puoi provare a specificare la versione più alta di jackson-core e qualsiasi altra dipendenza dall'artefatto di jackson che stai tentando di utilizzare.

Tuttavia, con Spring in questione, potrei vedere se riesci a cavartela con la versione di jackson più bassa che chiama, o vedere se Spring ha rilasciato una nuova versione che include le nuove librerie di jackson. Sostituire la struttura delle dipendenze di Spring mina uno dei motivi principali per l'utilizzo di Spring in primo luogo: si ottiene un set di dipendenze interrelate più completo da compilare subito dopo l'installazione.