springcloud feign 注入bean null问题

其他 2018-10-17 18:10:53 阅读次数: 0

此问题主要是由于feign 和swagger2版本冲突导致的。

本人用到的springcloud版本，如下：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.2.RELEASE</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>Dalston.RELEASE</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>

swagger2版本：

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.2.2</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.2.2</version>
</dependency>

导致启动项目失败，错误如下：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘demoController’: Unsatisfied dependency expressed through field ‘schedualServiceHi’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘com.qtdbp.trading.client.HiService’: FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor A u t o w i r e d F i e l d E l e m e n t . i n j e c t ( A u t o w i r e d A n n o t a t i o n B e a n P o s t P r o c e s s o r . j a v a : 588 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . a n n o t a t i o n . I n j e c t i o n M e t a d a t a . i n j e c t ( I n j e c t i o n M e t a d a t a . j a v a : 88 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . a n n o t a t i o n . A u t o w i r e d A n n o t a t i o n B e a n P o s t P r o c e s s o r . p o s t P r o c e s s P r o p e r t y V a l u e s ( A u t o w i r e d A n n o t a t i o n B e a n P o s t P r o c e s s o r . j a v a : 366 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . p o p u l a t e B e a n ( A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . j a v a : 1264 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . d o C r e a t e B e a n ( A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . j a v a : 553 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . c r e a t e B e a n ( A b s t r a c t A u t o w i r e C a p a b l e B e a n F a c t o r y . j a v a : 483 ) a t o r g . s p r i n g f r a m e w o r k . b e a n s . f a c t o r y . s u p p o r t . A b s t r a c t B e a n F a c t o r y 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:761)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
at com.qtdbp.trading.WebApplication.main(WebApplication.java:30)
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.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘com.qtdbp.trading.client.HiService’: FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1634)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1309)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1275)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor A u t o w i r e d F i e l d E l e m e n t . i n j e c t ( A u t o w i r e d A n n o t a t i o n B e a n P o s t P r o c e s s o r . j a v a : 585 ) … 24 c o m m o n f r a m e s o m i t t e d C a u s e d b y : j a v a . l a n g . N u l l P o i n t e r E x c e p t i o n : n u l l a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . p r o p e r t y . O p t i m i z e d M o d e l P r o p e r t i e s P r o v i d e r . b e a n D e s c r i p t i o n ( O p t i m i z e d M o d e l P r o p e r t i e s P r o v i d e r . j a v a : 317 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . p r o p e r t y . O p t i m i z e d M o d e l P r o p e r t i e s P r o v i d e r . p r o p e r t i e s F o r ( O p t i m i z e d M o d e l P r o p e r t i e s P r o v i d e r . j a v a : 117 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . p r o p e r t y . O p t i m i z e d M o d e l P r o p e r t i e s P r o v i d e r F a s t C l a s s B y S p r i n g C G L I B c b 306 b b 2. i n v o k e ( ) a t o r g . s p r i n g f r a m e w o r k . c g l i b . p r o x y . M e t h o d P r o x y . i n v o k e ( M e t h o d P r o x y . j a v a : 204 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . C g l i b A o p P r o x y CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85)
at springfox.documentation.spring.web.caching.CachingAspect.cachedValue(CachingAspect.java:86)
at springfox.documentation.spring.web.caching.CachingAspect.operationsAndProperties(CachingAspect.java:69)
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.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:629)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:618)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:168)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy D y n a m i c A d v i s e d I n t e r c e p t o r . i n t e r c e p t ( C g l i b A o p P r o x y . j a v a : 656 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . p r o p e r t y . O p t i m i z e d M o d e l P r o p e r t i e s P r o v i d e r E n h a n c e r B y S p r i n g C G L I B 48 c 6024 c . p r o p e r t i e s F o r ( ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r . p r o p e r t i e s F o r ( M o d e l D e p e n d e n c y P r o v i d e r . j a v a : 184 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r . n o n T r i v i a l P r o p e r t i e s ( M o d e l D e p e n d e n c y P r o v i d e r . j a v a : 132 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r . r e s o l v e d P r o p e r t i e s A n d F i e l d s ( M o d e l D e p e n d e n c y P r o v i d e r . j a v a : 121 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r . r e s o l v e d D e p e n d e n c i e s ( M o d e l D e p e n d e n c y P r o v i d e r . j a v a : 100 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r . d e p e n d e n t M o d e l s ( M o d e l D e p e n d e n c y P r o v i d e r . j a v a : 62 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r F a s t C l a s s B y S p r i n g C G L I B a c 0 d 0878. i n v o k e ( ) a t o r g . s p r i n g f r a m e w o r k . c g l i b . p r o x y . M e t h o d P r o x y . i n v o k e ( M e t h o d P r o x y . j a v a : 204 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . C g l i b A o p P r o x y CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85)
at springfox.documentation.spring.web.caching.CachingAspect.cachedValue(CachingAspect.java:86)
at springfox.documentation.spring.web.caching.CachingAspect.modelsAndDependencies(CachingAspect.java:80)
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.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:629)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:618)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:168)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy D y n a m i c A d v i s e d I n t e r c e p t o r . i n t e r c e p t ( C g l i b A o p P r o x y . j a v a : 656 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . M o d e l D e p e n d e n c y P r o v i d e r E n h a n c e r B y S p r i n g C G L I B 4669045 e . d e p e n d e n t M o d e l s ( ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . D e f a u l t M o d e l P r o v i d e r . d e p e n d e n c i e s ( D e f a u l t M o d e l P r o v i d e r . j a v a : 113 ) a t s p r i n g f o x . d o c u m e n t a t i o n . s c h e m a . D e f a u l t M o d e l P r o v i d e r F a s t C l a s s B y S p r i n g C G L I B 2 c 8 f 6146. i n v o k e ( ) a t o r g . s p r i n g f r a m e w o r k . c g l i b . p r o x y . M e t h o d P r o x y . i n v o k e ( M e t h o d P r o x y . j a v a : 204 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . C g l i b A o p P r o x y CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)
at springfox.documentation.schema.DefaultModelProvider
EnhancerBySpringCGLIB
674eff88.dependencies()
at springfox.documentation.spring.web.scanners.ApiModelReader.populateDependencies(ApiModelReader.java:131)
at springfox.documentation.spring.web.scanners.ApiModelReader.read(ApiModelReader.java:75)
at springfox.documentation.spring.web.scanners.ApiListingScanner.scan(ApiListingScanner.java:91)
at springfox.documentation.spring.web.scanners.ApiDocumentationScanner.scan(ApiDocumentationScanner.java:62)
at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.scanDocumentation(DocumentationPluginsBootstrapper.java:101)
at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.onApplicationEvent(DocumentationPluginsBootstrapper.java:87)
at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.onApplicationEvent(DocumentationPluginsBootstrapper.java:50)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:383)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:389)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:337)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:882)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545)
at org.springframework.cloud.context.named.NamedContextFactory.createContext(NamedContextFactory.java:116)
at org.springframework.cloud.context.named.NamedContextFactory.getContext(NamedContextFactory.java:85)
at org.springframework.cloud.context.named.NamedContextFactory.getInstance(NamedContextFactory.java:121)
at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.get(FeignClientFactoryBean.java:127)
at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.feign(FeignClientFactoryBean.java:84)
at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:155)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)
… 34 common frames omitted

解决办法：

  1. 如果swagger版本是v1.x，那么请参考：https://segmentfault.com/a/1190000006595187

  2. 如果swagger版本是v2.x，那么请将升级swagger版本到2.5.0以上即可。

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.5.0</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.5.0</version>
</dependency>

转载地址：https://blog.csdn.net/caidchen/article/details/73949624

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