added WrongServiceTypeException

backend/src/main/java/com/vaessl/app/connection/ConnectionService.java

@@ -8,6 +8,7 @@ import org.springframework.stereotype.Service;
 
 import com.vaessl.app.dto.ConnectionRequest;
 import com.vaessl.app.dto.ConnectionResponse;
+import com.vaessl.app.exception.WrongServiceTypeException;
 
 @Service
 public class ConnectionService {
@@ -26,6 +27,10 @@ public class ConnectionService {
 
         ConnectionProvider provider = providerRegistry.get(request.serviceType());
 
+        if (provider == null) {
+            throw new WrongServiceTypeException();
+        }
+
         provider.checkCredentials(request);
 
         ConnectionResponse response = provider.authenticate(request);