org springframework beans factory UnsatisfiedDependencyException Error creating bean with name demoRestController

Question

I am new to Spring and I am try to make a application for learning but I am getting problem in Autowiring I am adding my code  I am working on spring boot   Spring Boot Code  public class DemoApplication        public static void main String   args            SpringApplication run DemoApplication class  args             LoginBean java   Service  Component public class LoginBean       private String userId      private String pwd       public String getUserId             return userId             public void setUserId String userId            this userId   userId             public String getPwd             return pwd             public void setPwd String pwd            this pwd   pwd          DemoRestController java   RestController  EnableAutoConfiguration  RequestMapping   demo    Component public class DemoRestController         private final LoginBean loginBean        Autowired     public DemoRestController LoginBean loginBean            this loginBean loginBean              RequestMapping value     login  id   pwd    method   RequestMethod GET  produces    application json       public  ResponseBody LoginBean loginService  PathVariable String id   PathVariable String pwd              LoginBean loginBean   new LoginBean             loginBean setUserId id           loginBean setPwd pwd           return loginBean          I tried following scenarios to make my  Autowired work      Autowired to LoginBean loginBean  Created getter setter of LoginBean in Controller class and autowired setters  Created constructor of Controller and autowired  as given in above code     Below is the error which I am getting  org springframework beans factory UnsatisfiedDependencyException  Error creating bean with name  demoRestController   Unsatisfied dependency expressed through constructor argument with index 0 of type  com ag digital demo bean LoginBean   No qualifying bean of type  com ag digital demo bean LoginBean  found for dependency  expected at least 1 bean which qualifies as autowire candidate for this dependency  Dependency annotations      nested exception is org springframework beans factory NoSuchBeanDefinitionException  No qualifying bean of type  com ag digital demo bean LoginBean  found for dependency  expected at least 1 bean which qualifies as autowire candidate for this dependency  Dependency annotations         at org springframework beans factory support ConstructorResolver createArgumentArray ConstructorResolver java 749    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support ConstructorResolver autowireConstructor ConstructorResolver java 185    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractAutowireCapableBeanFactory autowireConstructor AbstractAutowireCapableBeanFactory java 1143    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractAutowireCapableBeanFactory createBeanInstance AbstractAutowireCapableBeanFactory java 1046    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractAutowireCapableBeanFactory doCreateBean AbstractAutowireCapableBeanFactory java 510    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractAutowireCapableBeanFactory createBean AbstractAutowireCapableBeanFactory java 482    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractBeanFactory 1 getObject AbstractBeanFactory java 306    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support DefaultSingletonBeanRegistry getSingleton DefaultSingletonBeanRegistry java 230    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractBeanFactory doGetBean AbstractBeanFactory java 302    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support AbstractBeanFactory getBean AbstractBeanFactory java 197    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support DefaultListableBeanFactory preInstantiateSingletons DefaultListableBeanFactory java 772    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework context support AbstractApplicationContext finishBeanFactoryInitialization AbstractApplicationContext java 839    spring-context-4 2 6 RELEASE jar 4 2 6 RELEASE      at org springframework context support AbstractApplicationContext refresh AbstractApplicationContext java 538    spring-context-4 2 6 RELEASE jar 4 2 6 RELEASE      at org springframework boot context embedded EmbeddedWebApplicationContext refresh EmbeddedWebApplicationContext java 118    spring-boot-1 3 3 RELEASE jar 1 3 3 RELEASE      at org springframework boot SpringApplication refresh SpringApplication java 766   spring-boot-1 3 3 RELEASE jar 1 3 3 RELEASE      at org springframework boot SpringApplication createAndRefreshContext SpringApplication java 361   spring-boot-1 3 3 RELEASE jar 1 3 3 RELEASE      at org springframework boot SpringApplication run SpringApplication java 307   spring-boot-1 3 3 RELEASE jar 1 3 3 RELEASE      at org springframework boot SpringApplication run SpringApplication java 1191   spring-boot-1 3 3 RELEASE jar 1 3 3 RELEASE      at org springframework boot SpringApplication run SpringApplication java 1180   spring-boot-1 3 3 RELEASE jar 1 3 3 RELEASE      at com ag digital demo boot DemoApplication main DemoApplication java 14   classes  na  Caused by  org springframework beans factory NoSuchBeanDefinitionException  No qualifying bean of type  com ag digital demo bean LoginBean  found for dependency  expected at least 1 bean which qualifies as autowire candidate for this dependency  Dependency annotations         at org springframework beans factory support DefaultListableBeanFactory raiseNoSuchBeanDefinitionException DefaultListableBeanFactory java 1373    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support DefaultListableBeanFactory doResolveDependency DefaultListableBeanFactory java 1119    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support DefaultListableBeanFactory resolveDependency DefaultListableBeanFactory java 1014    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support ConstructorResolver resolveAutowiredArgument ConstructorResolver java 813    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE      at org springframework beans factory support ConstructorResolver createArgumentArray ConstructorResolver java 741    spring-beans-4 2 5 RELEASE jar 4 2 5 RELEASE          19 common frames omitted

User · Accepted Answer

Your DemoApplication class is in the com ag digital demo boot package and your LoginBean class is in the com ag digital demo bean package  By default components  classes annotated with  Component  are found if they are in the same package or a sub-package of your main application class DemoApplication  This means that LoginBean isn t being found so dependency injection fails   There are a couple of ways to solve your problem    Move LoginBean into com ag digital demo boot or a sub-package  Configure the packages that are scanned for components using the scanBasePackages attribute of  SpringBootApplication that should be on DemoApplication    A few of other things that aren t causing a problem  but are not quite right with the code you ve posted     Service is a specialisation of  Component so you don t need both on LoginBean Similarly   RestController is a specialisation of  Component so you don t need both on DemoRestController DemoRestController is an unusual place for  EnableAutoConfiguration  That annotation is typically found on your main application class  DemoApplication  either directly or via  SpringBootApplication which is a combination of  ComponentScan   Configuration  and  EnableAutoConfiguration

User · Answer

To me it happened in DogController that autowired DogService that autowired DogRepository  Dog class used to have field name but I changed it to coolName  but didn t change methods in DogRepository  Dog findDogByName String name   I change that method to Dog findDogByCoolName String name  and now it works

[java] org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'demoRestController'

Examples related to java

Examples related to dependency-injection

Examples related to spring-boot