json异常com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type #657

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本文讨论了在使用@ResponseBody JSON注解时遇到的问题，即从数据库中取出的数据包含对象时导致的com.fasterxml.jackson.databind.JsonMappingException异常，并探讨了解决方案。

 com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type #657 

我的数据库表与表进行关联后，导致，第一表取出数据，关联的那张表取出的是一个对象，当使用 @ResponseBody   JSON注解的时候，就是不能在对象里面包含一个对象，进行封装成json数据格式，这样在页面上不能解析

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Error starting ApplicationContext. 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threw exception; nested exception is java.lang.IllegalArgumentException: includeAs cannot be null at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:745) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:420) at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1317) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) at com.bishe.campus.CampusApplication.main(CampusApplication.java:19) Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name &#39;canteenServiceImpl&#39;: Unsatisfied dependency expressed through field &#39;redisTemplate&#39;; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name &#39;redisTemplate&#39; defined in class path resource [com/bishe/campus/common/config/RedisConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.core.RedisTemplate]: Factory method &#39;redisTemplate&#39; threw exception; nested exception is java.lang.IllegalArgumentException: includeAs cannot be null at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ... 20 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name &#39;redisTemplate&#39; defined in class path resource [com/bishe/campus/common/config/RedisConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.core.RedisTemplate]: Factory method &#39;redisTemplate&#39; threw exception; nested exception is java.lang.IllegalArgumentException: includeAs cannot be null at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ... 34 common frames omitted Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.core.RedisTemplate]: Factory method &#39;redisTemplate&#39; threw exception; nested exception is java.lang.IllegalArgumentException: includeAs cannot be null at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ... 47 common frames omitted Caused by: java.lang.IllegalArgumentException: includeAs cannot be null at com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder.inclusion(StdTypeResolverBuilder.java:232) at com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder.inclusion(StdTypeResolverBuilder.java:19) at com.fasterxml.jackson.databind.ObjectMapper.activateDefaultTyping(ObjectMapper.java:1970) at com.bishe.campus.common.config.RedisConfig.redisTemplate(RedisConfig.java:30) at com.bishe.campus.common.config.RedisConfig$$EnhancerBySpringCGLIB$$a51713fe.CGLIB$redisTemplate$0(<generated>) at com.bishe.campus.common.config.RedisConfig$$EnhancerBySpringCGLIB$$a51713fe$$FastClassBySpringCGLIB$$28f199dd.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) at com.bishe.campus.common.config.RedisConfig$$EnhancerBySpringCGLIB$$a51713fe.redisTemplate(<generated>) 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:498) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ... 48 common frames omitted Process finished with exit code 1
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// 设置Value序列化为JSON（需引入Jackson依赖） template.setValueSerializer(new GenericJackson2JsonRedisSerializer()); template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer()); ...
package com.kucun.controller; import com.fasterxml.jackson.databind.ObjectMapper; import com.kucun.Service.AppService; import com.kucun.Service.DynamicRepositoryService; import com.kucun.data.entity.*; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.Collections; import java.util.HashMap; import java.util.Map; @RestController @RequestMapping("/app") public class AppController { @Autowired // Java 8 兼容的实体类型映射 private DynamicRepositoryService dynamicRepositoryService; @Autowired private AppService appService; @Autowired private ObjectMapper objectMapper; private Map<String, Class<?>> ENTITY_MAP = dynamicRepositoryService.getStringClassMap(); // ====================== 数据查询 ====================== @GetMapping("/all") public Information getAllData() { return appService.getAllData(); } @GetMapping("/all/{entityType}") public Information getEntityData(@PathVariable String entityType) { return appService.getEntityData(entityType.toLowerCase()); } // ====================== CRUD操作 ====================== @PostMapping("/add/{entityType}") public Information addEntity( @PathVariable String entityType, @RequestBody Map<String, Object> requestBody ) { return handleEntityOperation(entityType, requestBody, "add"); } @PostMapping("/select/{entityType}") public Information queryEntity( @PathVariable String entityType, @RequestBody Map<String, Object> requestBody ) { return handleEntityOperation(entityType, requestBody, "select"); } @PostMapping("/delete/{entityType}") public Information deleteEntity( @PathVariable String entityType, @RequestBody Map<String, Object> requestBody ) { return handleEntityOperation(entityType, requestBody, "delete"); } @PostMapping("/update/{entityType}") public Information updateEntity( @PathVariable String entityType, @RequestBody Map<String, Object> requestBody ) { return handleEntityOperation(entityType, requestBody, "update"); } // ====================== 核心辅助方法 ====================== private Information handleEntityOperation( String entityType, Map<String, Object> requestBody, String operation ) { String normalizedType = entityType.toLowerCase(); Class<?> entityClass = ENTITY_MAP.get(normalizedType); if (entityClass == null) { return Information.NewFail("不支持的实体类型: " + entityType); } try { Object entity = objectMapper.convertValue(requestBody, entityClass); System.out.println(Information.NewSuccess(requestBody).DataJson()); switch (operation) { case "add": return appService.addEntity(entity); case "select": return appService.queryEntity(entity); case "delete": // 确保实体实现了EntityBasis接口 if (entity instanceof EntityBasis) { return appService.deleteEntity((EntityBasis) entity); } else { return Information.NewFail("删除操作需要实体实现EntityBasis接口"); } case "update": return appService.updateEntity(entity); default: return Information.NewFail("无效的操作类型"); } } catch (Exception e) { return Information.NewFail(operation + "操作失败: " + e.getMessage()); } } } org.springframework.beans.factory.BeanCreationException: Error creating bean with name &#39;appController&#39; defined in file [E:\编辑\apache-tomcat-9.0.37\apache-tomcat-9.0.37\webapps\KuCun2\WEB-INF\classes\com\kucun\controller\AppController.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.kucun.controller.AppController]: Constructor threw exception; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1323) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1218) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:755) ~[spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:402) ~[spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:173) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:153) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:95) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE] at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172) [spring-web-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128) [catalina.jar:9.0.37] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [catalina.jar:9.0.37] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717) [catalina.jar:9.0.37] at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690) [catalina.jar:9.0.37] at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705) [catalina.jar:9.0.37] at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1133) [catalina.jar:9.0.37] at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1866) [catalina.jar:9.0.37] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_331] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_331] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-util.jar:9.0.37] at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112) [na:1.8.0_331] at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1045) [catalina.jar:9.0.37] at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:429) [catalina.jar:9.0.37] at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1576) [catalina.jar:9.0.37] at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:309) [catalina.jar:9.0.37] at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) [catalina.jar:9.0.37] at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423) [catalina.jar:9.0.37] at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366) [catalina.jar:9.0.37] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:936) [catalina.jar:9.0.37] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) [catalina.jar:9.0.37] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [catalina.jar:9.0.37] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) [catalina.jar:9.0.37] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) [catalina.jar:9.0.37] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_331]
最新发布
06-23
importcom.fasterxml.jackson.databind.ObjectMapper;importcom.kucun.Service.AppService;importcom.kucun.Service.DynamicRepositoryService;importcom.kucun.data.entity.*;importorg.springframework.beans....
【jackson 异常】com.fasterxml.jackson.databind.JsonMappingException异常处理
p15097962069的博客
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【jackson 异常】com.fasterxml.jackson.databind.JsonMappingException异常处理
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QQ_DNS的博客
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在那个实体类中添加无参构造函数和有参构造函数就解决了
报错com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException)
一清道长的个人博客
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https://blog.csdn.net/gy7907/article/details/85761742
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize out of START_ARRAY token
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