@RestController
public class MyController {
    MyController(TestBean1 testBean1) {
    }
    @GetMapping("/greeting")
    public String sayHello() {
        this.testBean1<*>
        return "Hello Greeting";
    }
}

@RestController
public class MyController {
    private final TestBean1 testBean1;
    MyController(final TestBean1 testBean1) {
    }
    @GetMapping("/greeting")
    public String sayHello() {
        this.testBean1<*>
        return "Hello Greeting";
    }
}