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@Setter
@Getter
@NoArgsConstructor
@AllArgsConstructor
@SuperBuilder
@MappedSuperclass
public class BaseEntity {

    @Id
    @GeneratedValue(generator = "UUID")

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@SuperBuilder
@Setter
@Getter
@NoArgsConstructor
@AllArgsConstructor
@MappedSuperclass
public class BaseEntity {

    @Id
    @GeneratedValue(generator = "UUID")

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Install Virtualbox && Vagrant for MacOSX

Vagrant uses Virtualbox to manage the virtual dependencies. You can directly download virtualbox and install or use homebrew for it.

$ brew cask install virtualbox

Now install Vagrant either from the website or use homebrew for installing it.

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Typing vagrant from the command line will display a list of all available commands.

Be sure that you are in the same directory as the Vagrantfile when running these commands!

Creating a VM

• vagrant init -- Initialize Vagrant with a Vagrantfile and ./.vagrant directory, using no specified base image. Before you can do vagrant up, you'll need to specify a base image in the Vagrantfile.
• vagrant init <boxpath> -- Initialize Vagrant with a specific box. To find a box, go to the public Vagrant box catalog. When you find one you like, just replace it's name with boxpath. For example, vagrant init ubuntu/trusty64.

Starting a VM

• vagrant up -- starts vagrant environment (also provisions only on the FIRST vagrant up)

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Docker Commands, Help & Tips

Show commands & management commands

$ docker

Docker version info

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@Component
public class CustomErrorAttributes extends DefaultErrorAttributes {

    @Override
    public Map<String, Object> getErrorAttributes(WebRequest webRequest, ErrorAttributeOptions options) {
        Map<String, Object> errorAttributes = new LinkedHashMap();

        Map<String, Object> attributes = super.getErrorAttributes(webRequest, options);

        long timestamp = ((Date) attributes.get("timestamp")).getTime();

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public interface VoteRepository extends JpaRepository<Vote, Long> {
    @Query("SELECT NEW com.example.polls.model.ChoiceVoteCount(v.choice.id, count(v.id)) FROM Vote v WHERE v.poll.id in :pollIds GROUP BY v.choice.id")
    List<ChoiceVoteCount> countByPollIdInGroupByChoiceId(@Param("pollIds") List<Long> pollIds);

    @Query("SELECT NEW com.example.polls.model.ChoiceVoteCount(v.choice.id, count(v.id)) FROM Vote v WHERE v.poll.id = :pollId GROUP BY v.choice.id")
    List<ChoiceVoteCount> countByPollIdGroupByChoiceId(@Param("pollId") Long pollId);

    @Query("SELECT v FROM Vote v where v.user.id = :userId and v.poll.id in :pollIds")
    List<Vote> findByUserIdAndPollIdIn(@Param("userId") Long userId, @Param("pollIds") List<Long> pollIds);

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@ControllerAdvice
public class CustomExceptionControllerAdvice {

    @ExceptionHandler(MultipartException.class)
    void handleMultipartException(MultipartException ex,HttpServletResponse response) throws IOException {
        response.sendError(HttpStatus.BAD_REQUEST.value(),"Please select a file");
    }
  
    @ExceptionHandler(ConstraintViolationException.class)
    public void handleConstraintViolationException(ConstraintViolationException ex,HttpServletResponse response) throws IOException {

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@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public class AppException extends RuntimeException {
    public AppException(String message) {
        super(message);
    }

    public AppException(String message, Throwable cause) {
        super(message, cause);
    }
}

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@Configuration
public class ForwardedHeaderFilterConfig {

    @Bean
    public FilterRegistrationBean<ForwardedHeaderFilter> forwardedHeaderFilter() {
        FilterRegistrationBean<ForwardedHeaderFilter> result = new FilterRegistrationBean<>();
        result.setFilter(new ForwardedHeaderFilter());
        result.setOrder(0);
        return result;
    }