Prototype Bean doesn't get autowired as expected

Question

TestController.java

@RestController
public class TestController {

    @Autowired
    private TestClass testClass;

    @RequestMapping(value = \"/test\", method         


        

Answer 1

The key point hear is that the restController bean is a singleton and Spring will create only one instance of that bean during the creation of bean.

When you impose a prototype bean scope Spring will instance a new bean for every DI point. In other words if you configure a bean a two or n-times via xml or java-config this bean will have a fresh instance of your prototype-scoped bean.

In your case you use the annotation style that actually is the default way for web layer starting spring 3.x.

One possibility to inject a fresh bean may be achieved with a bean scoped on the session, but in my opinion if your use case is a rest WS that I consider stateless, the session use in my opinion is a bad choice.

A solution of your case may be use request scope.

Update I write also just a simple example

     @SpringBootApplication
     public class DemoApplication {

        public static void main(String[] args) {
            SpringApplication.run(DemoApplication.class, args);
        }

        @Bean
        @Scope(scopeName = "request",proxyMode = ScopedProxyMode.TARGET_CLASS)
        public RequestBeanTest requestBeanTest(){
            return new RequestBeanTest();
        }

    }

    class RequestBeanTest {
        public RequestBeanTest(){
            Random random = new Random();
            System.out.println(random.nextGaussian());
            System.out.println("new object was created");
        }

        private String prop;

        public String execute(){

            return "hello!!!";
        }

        public String getProp() {
            return prop;
        }

        public void setProp(String prop) {
            this.prop = prop;
        }
    }


    @RestController
    class RestTemplateTest {

        @Autowired
        private RequestBeanTest requestBeanTest;

        @RequestMapping("/testUrl")
        public ResponseEntity responseEntity(){
            requestBeanTest.setProp("test prop");

            System.out.println(requestBeanTest.getProp());
            return ResponseEntity.ok(requestBeanTest.execute());
        }
    }

the my pom.xml

    4.0.0

    com.example
    demo
    0.0.1-SNAPSHOT
    jar

    demo
    Demo project for Spring Boot

    
        org.springframework.boot
        spring-boot-starter-parent
        1.3.3.RELEASE
         
    

    
        UTF-8
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-actuator
        
        
            org.springframework.boot
            spring-boot-starter-web
        


        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

the bowser screen:

and the my log screen:

I don't know why it don't work for you probably you had forgot some configuration.

I hope that this more detalied solution can help you to understand how solve the your problem