org.springframework.beans.factory.UnsatisfiedDependencyException

springboot整合feign時報錯

報錯信息如下（截取前段部分信息）

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportController': Unsatisfied dependency expressed through field 'reportService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportServiceImpl': Unsatisfied dependency expressed through field 'uiasUserController'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cn.net.topnet.base.UiasUserController': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Method has too many Body parameters: public abstract java.util.Map cn.net.topnet.base.UiasUserController.getMsgByUserId(java.lang.String,java.lang.String)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:847)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)
	at cn.net.topnet.ReportApplication.main(ReportApplication.java:24)

主要部分

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportController': Unsatisfied dependency expressed through field 'reportService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportServiceImpl': Unsatisfied dependency expressed through field 'uiasUserController'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cn.net.topnet.base.UiasUserController': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Method has too many Body parameters: public abstract java.util.Map cn.net.topnet.base.UiasUserController.getMsgByUserId(java.lang.String,java.lang.String)

經查詢，定義的feigin接口類如下

@FeignClient(value = "uias")
public interface UiasUserController {

    @GetMapping(value = "/uias/user/getMsgByUserId")
    Map getMsgByUserId(@Param("userId")String userId, @Param("postId")String postId);
}

在參數定義方面使用的@Param注解，修改為@RequestParam修改后

@FeignClient(value = "uias")
public interface UiasUserController {

    @GetMapping(value = "/uias/user/getMsgByUserId")
    Map getMsgByUserId(@RequestParam("userId")String userId, @RequestParam("postId")String postId);
}

查詢相關博客，獲得解釋為

@RequestParam 用於controller層
（1）解決前台參數名稱與后台接收參數變量名稱不一致的問題，等價於request.getParam
（2）可設置value：指定參數名 default：指定變量初始值 require（true默認/false）:指定參數是否為必傳

@Param 用於dao層
個人理解為修飾參數，使得mapper.xml中的參數與后台的參數對應上，也增強了可讀性
如果兩者參數名一致得話，spring會自動進行封裝，不一致的時候就需要手動去使其對應上。

看了下注解源碼，兩種注解的接口類有所區別，限於水平有限，暫不做深入研究，如有道友指教一二，在下不勝感激涕零

 

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CosmosRay
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