@SpELAssert(value = "hasRedirectUris()", applyIf = "grantTypes.contains('auth_code')",
            message = "{validator.missing_redirect_uri}")
public class ClientDTO {

	private Collection<String> grantTypes;
	private Collection<String> redirectUris;

    public boolean hasRedirectUris() {
        return !redirectUris.isEmpty();
    }
}

@SpELAssert(value = "password.equals(passwordVerify)",
            applyIf = "password || passwordVerify",
            message = "{validator.passwords_not_same}")
public class User {

    private String password;
    private String passwordVerify;
}

@SpELAssert(value = "#isEven(count) && count > 42", applyIf = "enabled",
            helpers = Helpers.class)
public class Sample {

    private int count;
    private boolean enabled;
}

public class Sample {

    @SpELAssert(value = "#isEven(#this) && #this > 42",
                helpers = Helpers.class)
    private int count;
}

public final class Helpers {

    public static boolean isEven(int value) {
        return value % 2 == 0;
    }
    public static boolean isOdd(int value) {
        return value % 2 != 0;
    }
}

public class Sample {

    @SpELAssert("@myService.calculate(#this) > 42")
    private int value;
}

// Configuration is needed to allow autowiring of dependencies in custom validators.
@Configuration
public class ValidatorConfig {

    @Bean
    public LocalValidatorFactoryBean validatorFactoryBean() {
        return new LocalValidatorFactoryBean();
    }
}