Expanding Vehicle microservice functionality

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/VehicleApplication.java

+package edu.microserviceslab.vehiclemicroservice;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class VehicleApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(VehicleApplication.class, args);
+    }
+}

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/controller/VehicleController.java

@@ -2,9 +2,7 @@ package edu.microserviceslab.vehiclemicroservice.controller;
 
 import edu.microserviceslab.vehiclemicroservice.entity.Vehicle;
 import edu.microserviceslab.vehiclemicroservice.service.interfaces.VehicleService;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.ResponseBody;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
@@ -23,4 +21,10 @@ public class VehicleController {
     public List<Vehicle> listAllVehicles() {
         return vehicleService.getAllVehicles();
     }
+
+    @ResponseBody
+    @RequestMapping("/licensePlate/{vehicleId}")
+    public String getVehicleLicensePlate(@PathVariable("vehicleId") Long vehicleId) {
+        return vehicleService.getVehicleLicensePlate(vehicleId);
+    }
 }

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/entity/Vehicle.java

@@ -5,7 +5,6 @@ import org.apache.commons.lang3.builder.HashCodeBuilder;
 import org.apache.commons.lang3.builder.ToStringBuilder;
 
 import javax.persistence.*;
-import java.time.Year;
 
 @Entity
 public class Vehicle {

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/service/VehicleServiceImpl.java

 package edu.microserviceslab.vehiclemicroservice.service;
 
+import edu.microserviceslab.vehiclemicroservice.entity.Registration;
 import edu.microserviceslab.vehiclemicroservice.entity.Vehicle;
 import edu.microserviceslab.vehiclemicroservice.repo.VehicleRepo;
 import edu.microserviceslab.vehiclemicroservice.service.interfaces.VehicleService;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import java.util.Optional;
 
 @Service
 public class VehicleServiceImpl implements VehicleService {
@@ -20,4 +22,19 @@ public class VehicleServiceImpl implements VehicleService {
     public List<Vehicle> getAllVehicles() {
         return vehicleRepo.findAll();
     }
+
+    @Override
+    public String getVehicleLicensePlate(Long vehicleId) {
+        Optional<Vehicle> vehicle = vehicleRepo.findById(vehicleId);
+
+        String toReturn = null;
+        if (vehicle.isPresent()) {
+            Registration registration = vehicle.get().getRegistration();
+            if (registration != null) {
+                toReturn = registration.getLicensePlate();
+            }
+        }
+
+        return toReturn;
+    }
 }

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/service/interfaces/VehicleService.java

@@ -7,4 +7,6 @@ import java.util.List;
 public interface VehicleService {
 
     List<Vehicle> getAllVehicles();
+
+    String getVehicleLicensePlate(Long vehicleId);
 }