aSemy

@Service
public class GraphQLRuleService {
	// fetches messages from appropriate .prop file
	@Autowired
	private final MessagesService messagesService;

	public RuleSingle stringNonBlank(final String argumentName, final String fieldName) {
		return new RuleSingle() {
				@Override
				public Optional<GraphQLError> applySingle(FieldAndArguments fieldAndArguments, FieldValidationEnvironment environment)  {

aSemy

// Rule.java
public abstract class Rule
implements BiFunction<FieldAndArguments, FieldValidationEnvironment, Optional<Collection<GraphQLError>>> {
}

// RuleSingle.java
public abstract class RuleSingle extends Rule {

  @Override
  public final Optional<Collection<GraphQLError>> apply(FieldAndArguments fieldAndArguments,

aSemy

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
  @Override
  protected void configure(HttpSecurity http) throws Exception {

    final CsrfTokenRepository csrfTokenRepository = CookieCsrfTokenRepository.withHttpOnlyFalse();

    http

aSemy

@GraphQLQuery(name = "getMeterReadings")
@PreAuthorize("isAuthenticated()")
public TreeSet<MeterReadingDTO> getMeterReadings(
  // ...
}

aSemy

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
  // ...
}