Spring annotations article (#4232)

* Spring annotations

* commented VehicleFactoryApplication to fix CI build

spring-mvc-java/src/main/java/com/baeldung/annotations/Bike.java

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+package com.baeldung.annotations;
+
+import org.springframework.beans.factory.annotation.Required;
+import org.springframework.context.annotation.DependsOn;
+
+@DependsOn
+public class Bike implements Vehicle {
+
+    private String color;
+
+    @Required
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/Biker.java

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+package com.baeldung.annotations;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Biker {
+
+    @Autowired
+    @Qualifier("bike")
+    private Vehicle vehicle;
+
+    @Autowired
+    public Biker(@Qualifier("bike") Vehicle vehicle) {
+        this.vehicle = vehicle;
+    }
+
+    @Autowired
+    public void setVehicle(@Qualifier("bike") Vehicle vehicle) {
+        this.vehicle = vehicle;
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/Car.java

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+package com.baeldung.annotations;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.DependsOn;
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+
+@Component
+@Primary
+@DependsOn("engine")
+public class Car implements Vehicle {
+
+    @Autowired
+    private Engine engine;
+
+    @Autowired
+    public Car(Engine engine) {
+        this.engine = engine;
+    }
+
+    @Autowired
+    public void setEngine(Engine engine) {
+        this.engine = engine;
+    }
+
+    public Engine getEngine() {
+        return engine;
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/CarMechanic.java

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+package com.baeldung.annotations;
+
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Component;
+
+@Component
+@Lazy
+public class CarMechanic {
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/CarUtility.java

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+package com.baeldung.annotations;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class CarUtility {
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/Driver.java

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+package com.baeldung.annotations;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Driver {
+
+    @Autowired
+    private Vehicle vehicle;
+
+    @Autowired
+    public Driver(Vehicle vehicle) {
+        this.vehicle = vehicle;
+    }
+
+    @Autowired
+    public void setVehicle(Vehicle vehicle) {
+        this.vehicle = vehicle;
+    }
+
+    public Vehicle getVehicle() {
+        return vehicle;
+    }
+
+    @Scheduled(fixedRate = 10000)
+    @Scheduled(cron = "0 * * * * MON-FRI")
+    public void checkVehicle() {
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/Engine.java

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+package com.baeldung.annotations;
+
+import org.springframework.beans.factory.annotation.Value;
+
+public class Engine {
+
+    @Value("8")
+    private int cylinderCount;
+
+    @Value("${engine.fuelType}")
+    private String fuelType;
+
+    public Engine() {
+        this(8);
+    }
+
+    public Engine(@Value("8") int cylinderCount) {
+        this.cylinderCount = cylinderCount;
+    }
+
+    @Value("8")
+    public void setCylinderCount(int cylinderCount) {
+        this.cylinderCount = cylinderCount;
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/Vehicle.java

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+package com.baeldung.annotations;
+
+public interface Vehicle {
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/VehicleController.java

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+package com.baeldung.annotations;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@Controller
+@RequestMapping(value = "/vehicles", method = RequestMethod.GET)
+public class VehicleController {
+
+    @CrossOrigin
+    @ResponseBody
+    @RequestMapping("/hello")
+    public String hello() {
+        return "Hello World!";
+    }
+
+    @RequestMapping("/home")
+    public String home() {
+        return "home";
+    }
+
+    @PostMapping("/save")
+    public void saveVehicle(@RequestBody Vehicle vehicle) {
+    }
+
+    @RequestMapping("/{id}")
+    public Vehicle getVehicle(@PathVariable("id") long id) {
+        return null;
+    }
+
+    @RequestMapping
+    public Vehicle getVehicleByParam(@RequestParam("id") long id) {
+        return null;
+    }
+
+    @RequestMapping("/buy")
+    public Car buyCar(@RequestParam(defaultValue = "5") int seatCount) {
+        return null;
+    }
+
+    @ExceptionHandler(IllegalArgumentException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public void onIllegalArgumentException(IllegalArgumentException exception) {
+    }
+
+    @PostMapping("/assemble")
+    public void assembleVehicle(@ModelAttribute("vehicle") Vehicle vehicle) {
+    }
+
+    @ModelAttribute("vehicle")
+    public Vehicle getVehicle() {
+        return null;
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/VehicleFactoryApplication.java

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+package com.baeldung.annotations;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+// @SpringBootApplication
+public class VehicleFactoryApplication {
+
+//    public static void main(String[] args) {
+//        SpringApplication.run(VehicleFactoryApplication.class, args);
+//    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/VehicleFactoryConfig.java

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+package com.baeldung.annotations;
+
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportResource;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.scheduling.annotation.EnableAsync;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@Configuration
+@ComponentScan(basePackages = "com.baeldung.annotations")
+@ComponentScan(basePackageClasses = VehicleFactoryConfig.class)
+@ImportResource("classpath:/annotations.xml")
+@PropertySource("classpath:/annotations.properties")
+@Lazy
+@EnableAutoConfiguration
+@EnableAsync
+@EnableScheduling
+public class VehicleFactoryConfig {
+
+    @Bean
+    @Lazy(false)
+    public Engine engine() {
+        return new Engine();
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/VehicleRepository.java

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+package com.baeldung.annotations;
+
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class VehicleRepository {
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/VehicleRestController.java

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+package com.baeldung.annotations;
+
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class VehicleRestController {
+
+}

spring-mvc-java/src/main/java/com/baeldung/annotations/VehicleService.java

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+package com.baeldung.annotations;
+
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Service;
+
+@Service
+public class VehicleService {
+
+    @Async
+    public void repairCar() {
+    }
+
+}

spring-mvc-java/src/main/resources/annotations.properties

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+engine.fuelType=petrol

spring-mvc-java/src/main/resources/annotations.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+    <bean class="com.baeldung.annotations.Bike" name="bike">
+        <property name="color" value="green" />
+    </bean>
+
+</beans>