added Custom Exception and some minor changes

src/main/java/com/strong/speedsyncrestful/Controller/VehicleController.java

@@ -9,6 +9,7 @@
 import org.springframework.web.bind.annotation.RestController;
 
 import com.strong.speedsyncrestful.Entity.Vehicle;
+import com.strong.speedsyncrestful.Exception.SpeedSyncException;
 import com.strong.speedsyncrestful.Service.VehicleService;
 
 @RestController
@@ -19,8 +20,8 @@ public class VehicleController {
     private VehicleService vehicleService;
 
     @PostMapping("challan")
-    public ResponseEntity<Void> regVehicles(@RequestBody Vehicle vehicle) {
-        vehicleService.regVehicle(vehicle);
+    public ResponseEntity<Void> generateChallan(@RequestBody Vehicle vehicle) throws SpeedSyncException {
+        vehicleService.challanSave(vehicle);
         return new ResponseEntity<>(HttpStatus.CREATED);
     }
 }

src/main/java/com/strong/speedsyncrestful/Exception/GlobalExceptionHandler.java

@@ -0,0 +1,20 @@
+package com.strong.speedsyncrestful.Exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(SpeedSyncException.class)
+
+    public ResponseEntity<?> handleSpeedException(SpeedSyncException exception) {
+        SpeedRes response = new SpeedRes();
+        response.setMessage(exception.getLocalizedMessage());
+        response.setStatus(HttpStatus.CONFLICT.value());
+        response.setTimeStamp(System.currentTimeMillis());
+        return new ResponseEntity<>(response, HttpStatus.CONFLICT);
+    }
+}

src/main/java/com/strong/speedsyncrestful/Exception/SpeedRes.java

@@ -0,0 +1,14 @@
+package com.strong.speedsyncrestful.Exception;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@NoArgsConstructor
+@Getter
+@Setter
+public class SpeedRes {
+    private String Message;
+    private Integer Status;
+    private long TimeStamp;
+}

src/main/java/com/strong/speedsyncrestful/Exception/SpeedSyncException.java

@@ -0,0 +1,22 @@
+package com.strong.speedsyncrestful.Exception;
+
+
+public class SpeedSyncException extends Exception {
+
+    public SpeedSyncException() {
+        super();
+    }
+
+    public SpeedSyncException(String Message) {
+        super(Message);
+    }
+
+    public SpeedSyncException(String Message, Throwable throwable) {
+        super(Message, throwable);
+    }
+
+    public SpeedSyncException(Throwable throwable) {
+        super(throwable);
+    }
+
+}

src/main/java/com/strong/speedsyncrestful/Service/VehicleService.java

@@ -1,11 +1,10 @@
 package com.strong.speedsyncrestful.Service;
 
-import java.util.List;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import com.strong.speedsyncrestful.Entity.Vehicle;
+import com.strong.speedsyncrestful.Exception.SpeedSyncException;
 import com.strong.speedsyncrestful.Repository.VehicleRepo;
 
 import lombok.NonNull;
@@ -16,12 +15,13 @@ public class VehicleService {
     @Autowired
     private VehicleRepo vehicleRepo;
 
-    public void regVehicle(@NonNull Vehicle vehicle) {
+    public void challanSave(@NonNull Vehicle vehicle) throws SpeedSyncException {
         vehicle.setTimestamp(System.currentTimeMillis());
-        vehicleRepo.save(vehicle);
+        try {
+            vehicleRepo.save(vehicle);
+        } catch (Exception ex) {
+            throw new SpeedSyncException("Failed to Generate Challan: " + ex.getMessage());
+        }
     }
 
-    public List<Vehicle> getVehicles() {
-        return vehicleRepo.findAll();
-    }
 }