Spring: FasterXML не может получить доступ к члену класса с модификаторами private

Question

Я откуда-то получаю неизвестную ошибку, и все это началось сегодня. Я понятия не имею, что происходит не так. Я не могу найти много сообщений, у которых есть эта проблема. Я отправляю свой журнал ошибок и свою конфигурацию. Может ли кто-нибудь сказать мне, что не так. Благодарю.

Журнал ошибок:

Sep 08, 2015 2:21:47 PM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [appServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Failed to instantiate standard serializer (of type com.fasterxml.jackson.databind.ser.std.NullSerializer): Class com.fasterxml.jackson.databind.ser.BasicSerializerFactory can not access a member of class com.fasterxml.jackson.databind.ser.std.NullSerializer with modifiers "private"] with root cause 
java.lang.IllegalAccessException: Class com.fasterxml.jackson.databind.ser.BasicSerializerFactory can not access a member of class com.fasterxml.jackson.databind.ser.std.NullSerializer with modifiers "private" 
    at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102) 
    at java.lang.Class.newInstance(Class.java:436) 
    at com.fasterxml.jackson.databind.ser.BasicSerializerFactory.findSerializerByLookup(BasicSerializerFactory.java:299) 
    at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._createSerializer2(BeanSerializerFactory.java:210) 
    at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:152) 
    at com.fasterxml.jackson.databind.SerializerProvider._createUntypedSerializer(SerializerProvider.java:1077) 
    at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1037) 
    at com.fasterxml.jackson.databind.SerializerProvider._findExplicitUntypedSerializer(SerializerProvider.java:1018) 
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.hasSerializerFor(DefaultSerializerProvider.java:336) 
    at com.fasterxml.jackson.databind.ObjectMapper.canSerialize(ObjectMapper.java:1996) 
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.canWrite(AbstractJackson2HttpMessageConverter.java:162) 
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.getProducibleMediaTypes(AbstractMessageConverterMethodProcessor.java:204) 
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:122) 
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:101) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:167) 
    at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:71) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:126) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.filters.ExpiresFilter.doFilter(ExpiresFilter.java:1179) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316) 
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) 
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:157) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:168) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:133) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213) 
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176) 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344) 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Thread.java:745) 

конфигурации файлов:

корня context.xml:

<context:component-scan base-package="com.journaldev.spring"> 
     <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> 
    </context:component-scan> 

    <context:property-placeholder location="classpath:application.properties"/> 

    <beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
       destroy-method="close"> 
     <beans:property name="driverClassName" value="org.postgresql.Driver"/> 
     <beans:property name="url" 
         value="jdbc:postgresql://localhost:5432/Person2"/> 
     <beans:property name="username" value="username"/> 
     <beans:property name="password" value="password"/> 
     <beans:property name="removeAbandoned" value="true"/> 
     <beans:property name="removeAbandonedTimeout" value="20"/> 
     <beans:property name="defaultAutoCommit" value="false"/> 
    </beans:bean> 

    <!-- Hibernate 4 SessionFactory Bean definition --> 
    <beans:bean id="hibernate4AnnotatedSessionFactory" 
       class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
     <beans:property name="dataSource" ref="dataSource"/> 
     <beans:property name="packagesToScan" value="com.journaldev.spring.model"/> 

     <beans:property name="hibernateProperties"> 
      <beans:props> 
       <beans:prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</beans:prop> 
       <beans:prop key="hibernate.show_sql">false</beans:prop> 
       <!-- <beans:prop key="hibernate.jdbc.batch_size">1000</beans:prop> 
        <beans:prop key="hibernate.order_updates">true</beans:prop>--> 
       <beans:prop key="hibernate.hbm2ddl.auto">update</beans:prop> 
       <beans:prop key="cache.use_second_level_cache">true</beans:prop> 
       <beans:prop key="cache.use_query_cache">true</beans:prop> 
      </beans:props> 
     </beans:property> 
    </beans:bean> 

    <beans:bean id="LoginServiceImpl" class="com.journaldev.spring.service.LoginServiceImpl"/> 

    <task:annotation-driven/> 

    <tx:annotation-driven transaction-manager="transactionManager"/> 

    <beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
     <beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/> 
    </beans:bean> 

    <cache:annotation-driven /> 

    <beans:bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager"> 
     <beans:property name="caches"> 
      <beans:set> 
       <beans:bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean" 
         p:name="person"/> 
      </beans:set> 
     </beans:property> 
    </beans:bean> 

    <!-- Configuration for Spring-Data-Redis --> 
    <beans:bean id="jedisConnFactory" 
       class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" p:usePool="true"/> 

    <beans:bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate" p:connectionFactory-ref="jedisConnFactory"/> 

</beans:beans> 

Servlet-context.xml:

<security:global-method-security 
      secured-annotations="enabled" 
      jsr250-annotations="disabled" 
      pre-post-annotations="enabled"/> 

    <context:component-scan base-package="com.journaldev.spring" use-default-filters="false"> 
     <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> 
    </context:component-scan> 

    <context:property-placeholder location="classpath:application.properties"/> 

    <mvc:annotation-driven> 
     <mvc:argument-resolvers> 
      <beans:bean class="org.springframework.mobile.device.DeviceWebArgumentResolver"/> 
     </mvc:argument-resolvers> 
    </mvc:annotation-driven> 
    <mvc:interceptors> 
     <beans:bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor"/> 
     <beans:ref bean="localeChangeInterceptor"/> 
    </mvc:interceptors> 

    <mvc:default-servlet-handler/> 

    <resources mapping="/resources/" location="/resources/"/> 

    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <beans:property name="prefix" value="/WEB-INF/views/"/> 
     <beans:property name="suffix" value=".jsp"/> 
    </beans:bean> 

    <!-- locale --> 
    <beans:bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource"> 
     <beans:property name="basename" value="classpath:/locale/messages"/> 
     <beans:property name="defaultEncoding" value="UTF-8"/> 
    </beans:bean> 


    <!-- default locale --> 
    <beans:bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver"> 
     <beans:property name="defaultLocale" value="de"/> 
    </beans:bean> 

    <!-- Change locale via url. --> 
    <beans:bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"> 
     <beans:property name="paramName" value="lang"/> 
    </beans:bean> 

    <beans:bean id="handlerMapping" 
       class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"> 
     <beans:property name="interceptors"> 
      <beans:list> 
       <beans:ref bean="localeChangeInterceptor"/> 
      </beans:list> 
     </beans:property> 
    </beans:bean> 

    <beans:bean class="com.journaldev.spring.service.DoNotTruncateMyUrls"/> 

    <beans:bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 
     <beans:property name="maxUploadSize" value="2147483648"/> 
    </beans:bean> 
    <!-- 52428800 --> 


</beans:beans> 

pom.xml :

не может поставить pom.xml из тела-предела, here это адрес Pastebin

Если есть что-нибудь еще нужно, дайте мне знать.

Дерево:

[INFO] TOOLTANK:TOOLTANK:war:2.0-SNAPSHOT 
[INFO] +- com.evernote:evernote-api:jar:1.25.1:compile 
[INFO] +- org.scribe:scribe:jar:1.3.7:compile 
[INFO] +- com.memetix:microsoft-translator-java-api:jar:0.6.2:compile 
[INFO] +- com.atlassian.jira:jira-components:pom:6.4.9:compile 
[INFO] +- org.apache.httpcomponents:httpclient:jar:4.5:compile 
[INFO] | \- org.apache.httpcomponents:httpcore:jar:4.4.1:compile 
[INFO] +- com.atlassian.jira:jira-rest-java-client-core:jar:2.0.0-m26:compile 
[INFO] | +- com.atlassian.jira:jira-rest-java-client-api:jar:2.0.0-m26:compile 
[INFO] | | \- com.atlassian.httpclient:atlassian-httpclient-api:jar:0.13.2:compile 
[INFO] | |  \- com.atlassian.httpclient:atlassian-httpclient-spi:jar:0.13.2:compile 
[INFO] | +- com.atlassian.httpclient:atlassian-httpclient-apache-httpcomponents:jar:0.13.2:compile 
[INFO] | | +- com.atlassian.sal:sal-api:jar:2.7.0:compile 
[INFO] | | +- com.atlassian.event:atlassian-event:jar:2.2.0:compile 
[INFO] | | +- org.apache.httpcomponents:httpasyncclient-cache:jar:4.0-beta3-atlassian-1:compile 
[INFO] | | +- org.apache.httpcomponents:httpclient-cache:jar:4.2.1-atlassian-2:compile 
[INFO] | | +- org.apache.httpcomponents:httpasyncclient:jar:4.0-beta3-atlassian-1:compile 
[INFO] | | \- org.apache.httpcomponents:httpcore-nio:jar:4.2.2:compile 
[INFO] | +- com.atlassian.util.concurrent:atlassian-util-concurrent:jar:2.4.0-M9:compile 
[INFO] | +- org.apache.httpcomponents:httpmime:jar:4.1.2:compile 
[INFO] | \- com.google.guava:guava:jar:10.0.1:compile 
[INFO] +- com.sun.jersey:jersey-client:jar:1.8-atlassian-11:compile 
[INFO] +- com.sun.jersey:jersey-json:jar:1.8-atlassian-11:compile 
[INFO] | +- org.codehaus.jettison:jettison:jar:1.1:compile 
[INFO] | | \- stax:stax-api:jar:1.0.1:compile 
[INFO] | +- com.sun.xml.bind:jaxb-impl:jar:2.2.3-1:compile 
[INFO] | | \- javax.xml.bind:jaxb-api:jar:2.2.2:compile 
[INFO] | |  \- javax.xml.stream:stax-api:jar:1.0-2:compile 
[INFO] | +- org.codehaus.jackson:jackson-core-asl:jar:1.7.1:compile 
[INFO] | +- org.codehaus.jackson:jackson-mapper-asl:jar:1.7.1:compile 
[INFO] | +- org.codehaus.jackson:jackson-jaxrs:jar:1.7.1:compile 
[INFO] | \- org.codehaus.jackson:jackson-xc:jar:1.7.1:compile 
[INFO] +- com.sun.jersey:jersey-core:jar:1.8-atlassian-11:compile 
[INFO] +- com.googlecode.json-simple:json-simple:jar:1.1.1:compile 
[INFO] | \- junit:junit:jar:4.10:compile 
[INFO] |  \- org.hamcrest:hamcrest-core:jar:1.1:compile 
[INFO] +- com.atlassian.jira:jira-rest-java-client:jar:0.2:compile 
[INFO] | +- com.sun.jersey.contribs:jersey-multipart:jar:1.5:compile 
[INFO] | | \- org.jvnet:mimepull:jar:1.4:compile 
[INFO] | +- com.sun.jersey.contribs:jersey-apache-client:jar:1.5:compile 
[INFO] | | \- commons-httpclient:commons-httpclient:jar:3.1:compile 
[INFO] | +- com.sun.jersey.contribs.jersey-oauth:oauth-client:jar:1.5:compile 
[INFO] | \- com.sun.jersey.contribs.jersey-oauth:oauth-signature:jar:1.5:compile 
[INFO] +- org.mnode.ical4j:ical4j:jar:1.0.6:compile 
[INFO] | +- commons-lang:commons-lang:jar:2.6:compile 
[INFO] | \- backport-util-concurrent:backport-util-concurrent:jar:3.1:compile 
[INFO] +- org.springframework.data:spring-data-redis:jar:1.5.2.RELEASE:compile 
[INFO] | +- org.springframework:spring-context:jar:4.0.9.RELEASE:compile 
[INFO] | +- org.springframework:spring-context-support:jar:4.0.9.RELEASE:compile 
[INFO] | \- org.springframework:spring-aop:jar:4.0.9.RELEASE:compile 
[INFO] +- redis.clients:jedis:jar:2.7.3:compile 
[INFO] +- org.springframework.data:spring-data-commons:jar:1.10.2.RELEASE:compile 
[INFO] +- org.apache.commons:commons-pool2:jar:2.4.2:compile 
[INFO] +- com.google.apis:google-api-services-drive:jar:v2-rev175-1.18.0-rc:compile 
[INFO] +- com.google.apis:google-api-services-oauth2:jar:v2-rev92-1.20.0:compile 
[INFO] +- com.dropbox.core:dropbox-core-sdk:jar:1.7.7:compile 
[INFO] +- org.hibernate:hibernate-search-orm:jar:5.2.0.Final:compile 
[INFO] | \- org.hibernate:hibernate-search-engine:jar:5.2.0.Final:compile 
[INFO] |  +- org.apache.lucene:lucene-core:jar:4.10.4:compile 
[INFO] |  +- org.apache.lucene:lucene-analyzers-common:jar:4.10.4:compile 
[INFO] |  \- org.apache.lucene:lucene-facet:jar:4.10.4:compile 
[INFO] |  \- org.apache.lucene:lucene-queries:jar:4.10.4:compile 
[INFO] +- org.springframework.mobile:spring-mobile-device:jar:1.1.3.RELEASE:compile 
[INFO] +- org.springframework:spring-beans:jar:4.1.6.RELEASE:compile 
[INFO] +- org.springframework:spring-web:jar:4.1.6.RELEASE:compile 
[INFO] +- com.google.apis:google-api-services-calendar:jar:v3-rev121-1.19.0:compile 
[INFO] +- com.google.http-client:google-http-client-jackson:jar:1.19.0:compile 
[INFO] +- org.springframework.security.oauth:spring-security-oauth2:jar:2.0.3.RELEASE:compile 
[INFO] +- com.google.oauth-client:google-oauth-client-jetty:jar:1.19.0:compile 
[INFO] | +- com.google.oauth-client:google-oauth-client-java6:jar:1.19.0:compile 
[INFO] | \- org.mortbay.jetty:jetty:jar:6.1.26:compile 
[INFO] |  +- org.mortbay.jetty:jetty-util:jar:6.1.26:compile 
[INFO] |  \- org.mortbay.jetty:servlet-api:jar:2.5-20081211:compile 
[INFO] +- org.cometd.java:bayeux-api:jar:3.0.4:compile 
[INFO] +- org.cometd.javascript:cometd-javascript-jquery:war:3.0.4:compile 
[INFO] +- org.cometd.java:cometd-java-server:jar:3.0.4:compile 
[INFO] | +- org.cometd.java:cometd-java-common:jar:3.0.4:compile 
[INFO] | | \- org.eclipse.jetty:jetty-util-ajax:jar:9.2.9.v20150224:compile 
[INFO] | +- org.eclipse.jetty:jetty-util:jar:9.2.9.v20150224:compile 
[INFO] | \- org.eclipse.jetty:jetty-jmx:jar:9.2.9.v20150224:compile 
[INFO] +- org.eclipse.jetty:jetty-client:jar:9.2.9.v20150224:compile 
[INFO] | +- org.eclipse.jetty:jetty-http:jar:9.2.9.v20150224:compile 
[INFO] | \- org.eclipse.jetty:jetty-io:jar:9.2.9.v20150224:compile 
[INFO] +- org.cometd.java:cometd-java-client:jar:3.0.4:compile 
[INFO] +- org.cometd.java:cometd-java-annotations:jar:3.0.4:compile 
[INFO] | \- javax.annotation:jsr250-api:jar:1.0:compile 
[INFO] +- org.eclipse.jetty:jetty-servlets:jar:9.2.9.v20150224:compile 
[INFO] | \- org.eclipse.jetty:jetty-continuation:jar:9.2.9.v20150224:compile 
[INFO] +- com.google.apis:google-api-services-plus:jar:v1-rev216-1.20.0:compile 
[INFO] +- org.imgscalr:imgscalr-lib:jar:4.2:compile 
[INFO] +- com.google.api-client:google-api-client:jar:1.19.1:compile 
[INFO] | +- com.google.oauth-client:google-oauth-client:jar:1.19.0:compile 
[INFO] | +- com.google.http-client:google-http-client-jackson2:jar:1.19.0:compile 
[INFO] | \- com.google.guava:guava-jdk5:jar:13.0:compile 
[INFO] +- com.google.http-client:google-http-client:jar:1.19.0:compile 
[INFO] | \- com.google.code.findbugs:jsr305:jar:1.3.9:compile 
[INFO] +- xml-apis:xml-apis:jar:1.4.01:compile 
[INFO] +- commons-io:commons-io:jar:1.3.2:compile 
[INFO] +- commons-fileupload:commons-fileupload:jar:1.3.1:compile 
[INFO] +- javax.validation:validation-api:jar:1.0.0.GA:compile 
[INFO] +- org.hibernate:hibernate-validator:jar:4.3.1.Final:compile 
[INFO] | \- org.jboss.logging:jboss-logging:jar:3.1.0.CR2:compile 
[INFO] +- org.springframework:spring-webmvc:jar:4.1.6.RELEASE:compile 
[INFO] | \- org.springframework:spring-expression:jar:4.1.6.RELEASE:compile 
[INFO] +- org.springframework:spring-tx:jar:4.1.6.RELEASE:compile 
[INFO] +- org.springframework:spring-core:jar:4.1.6.RELEASE:compile 
[INFO] +- org.springframework:spring-orm:jar:4.1.6.RELEASE:compile 
[INFO] | \- org.springframework:spring-jdbc:jar:4.1.6.RELEASE:compile 
[INFO] +- org.hibernate:hibernate-core:jar:4.3.9.Final:compile 
[INFO] | +- org.jboss.logging:jboss-logging-annotations:jar:1.2.0.Beta1:compile 
[INFO] | +- org.jboss.spec.javax.transaction:jboss-transaction-api_1.2_spec:jar:1.0.0.Final:compile 
[INFO] | +- dom4j:dom4j:jar:1.6.1:compile 
[INFO] | +- org.hibernate.common:hibernate-commons-annotations:jar:4.0.5.Final:compile 
[INFO] | +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile 
[INFO] | +- org.javassist:javassist:jar:3.18.1-GA:compile 
[INFO] | +- antlr:antlr:jar:2.7.7:compile 
[INFO] | \- org.jboss:jandex:jar:1.1.0.Final:compile 
[INFO] +- org.hibernate:hibernate-entitymanager:jar:4.3.9.Final:compile 
[INFO] +- commons-dbcp:commons-dbcp:jar:1.4:compile 
[INFO] | \- commons-pool:commons-pool:jar:1.5.4:compile 
[INFO] +- org.aspectj:aspectjrt:jar:1.7.4:compile 
[INFO] +- joda-time:joda-time:jar:2.3:compile 
[INFO] +- com.itextpdf:itextpdf:jar:5.0.6:compile 
[INFO] | +- org.bouncycastle:bcmail-jdk14:jar:1.38:compile 
[INFO] | +- org.bouncycastle:bcprov-jdk14:jar:1.38:compile 
[INFO] | \- org.bouncycastle:bctsp-jdk14:jar:1.38:compile 
[INFO] +- commons-codec:commons-codec:jar:1.9:compile 
[INFO] +- javax.mail:mail:jar:1.4.4:compile 
[INFO] | \- javax.activation:activation:jar:1.1:compile 
[INFO] +- org.slf4j:slf4j-api:jar:1.7.5:compile 
[INFO] +- org.slf4j:jcl-over-slf4j:jar:1.7.5:runtime 
[INFO] +- org.slf4j:slf4j-log4j12:jar:1.7.5:runtime 
[INFO] +- log4j:log4j:jar:1.2.15:runtime 
[INFO] +- javax.inject:javax.inject:jar:1:compile 
[INFO] +- javax.servlet:javax.servlet-api:jar:3.1.0:provided 
[INFO] +- javax.servlet.jsp:jsp-api:jar:2.1:provided 
[INFO] +- javax.servlet:jstl:jar:1.2:compile 
[INFO] +- com.fasterxml.jackson.core:jackson-core:jar:2.3.3:compile 
[INFO] +- com.fasterxml.jackson.core:jackson-databind:jar:2.3.3:compile 
[INFO] | \- com.fasterxml.jackson.core:jackson-annotations:jar:2.3.0:compile 
[INFO] +- org.springframework.security:spring-security-web:jar:4.0.1.RELEASE:compile 
[INFO] | \- aopalliance:aopalliance:jar:1.0:compile 
[INFO] +- org.springframework.security:spring-security-config:jar:4.0.1.RELEASE:compile 
[INFO] +- org.springframework.security:spring-security-taglibs:jar:4.0.1.RELEASE:compile 
[INFO] | \- org.springframework.security:spring-security-acl:jar:4.0.1.RELEASE:compile 
[INFO] +- org.springframework.security:spring-security-core:jar:4.0.1.RELEASE:compile 
[INFO] +- commons-logging:commons-logging:jar:1.2:compile 
[INFO] +- org.postgresql:postgresql:jar:9.3-1102-jdbc41:compile 
[INFO] +- xerces:xercesImpl:jar:2.11.0:compile 
[INFO] +- com.google.code.gson:gson:jar:2.3.1:compile 
[INFO] \- org.json:json:jar:20141113:compile 
[INFO] ------------------------------------------------------------------------ 
[INFO] BUILD SUCCESS 
[INFO] ------------------------------------------------------------------------ 
[INFO] Total time: 11.406s 
[INFO] Finished at: Tue Sep 08 14:36:02 CEST 2015 
[INFO] Final Memory: 23M/404M 

Answer 1

См https://github.com/FasterXML/jackson-databind/issues/851

Это, как представляется, проблема в Джексоне 2 до 2.4.0. Наличие Jackson 1 также в classpath не кажется идеальным, но должно быть неуместным, поскольку они занимают совершенно разные пространства имен пакетов.

Answer 2

Я получил эту ошибку, когда я вернул пустоту из метода контроллера Spring MVC. Вернул пустую строку, исправил ее. Метод работы выглядит примерно так:

@RequestMapping(value="/deleteWidget", method=RequestMethod.POST) 
@ResponseBody 
public String deleteWidget(HttpServletRequest request) { 
    widgetService.deleteWidget(request.getParameter("widgetId")); 
    return ""; 
} 

Answer 3

Функция, которую вы вызывали, должна иметь возвращаемое значение (строка или нуль, ect.). функция не должна быть недействительной.