Getting Error, while trying to save data into database

[crisp falcon]

@Slf4j
@Service
public class StallServiceImpl implements StallService {

@Autowired
private StallRepository stallRepository;

@Autowired
private UserRoleService userRoleServcie;

@Autowired
private IUserService  userService;

@Override
public StallResponse saveStall(@Valid Stall stall) {
    UserRole roleExists =null;
    Stall isStallExisted = stallRepository.findByRoleId(stall.getUser().getId());
    User user = userService.findByUserId(stall.getUser().getId());

    if(user!=null) {
        roleExists = userRoleServcie.findRoleById(user.getUser_type_id());
        if(roleExists==null) {
            return StallResponse.builder().responseMessage("ROLE DOESN'T EXISTS").build();
        }
        else if(roleExists!=null&&roleExists.getUser_role().equals(VirtualexhibitionConstants.USER)) {
            return StallResponse.builder().responseMessage("INVALID IS EXHIBITOIR ID").build();
        }
        else if(roleExists!=null&&user.getStatus().equals(VirtualexhibitionConstants.UNAUTHORIZED_USER)) {
            return StallResponse.builder().responseMessage("PLEASE GET APPRVOAL FROM ADMIN TO CREATE STALL").build();
        }
        else if(isStallExisted!=null) {
            return StallResponse.builder().responseMessage("EXHIBITOR HAS STALL ALREADY").build();
        }
        else {
            Stall save = stallRepository.save(stall);
            return StallResponse.builder().responseMessage("SUCCESSFULLY STALL CREATED").stall(stall).build();
        }
    }   
     return StallResponse.builder().responseMessage("EXHIBITOR DOESN'T EXIST").build();
}

[waxen fjord]

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[waxen fjord]

Please format your code to make it more readable.
For java, it should look like this:
```​​​`​java
public void foo() {

}
​​​`​```