# Five ways to say 'this may not exist', with zero and with two Notifier beans (Email registered before Sms)


--- zero Notifier beans ---
plain constructor param          : FAILED NoSuchBeanDefinitionException
Optional<Notifier>               : isPresent=false
@Nullable Notifier               : value=null
ObjectProvider.getIfAvailable()  : null
ObjectProvider.getIfUnique()     : null
ObjectProvider.getObject()       : NoSuchBeanDefinitionException: No qualifying bean of type 'com.ankurm.coredi.injection.Notifier' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
@Autowired(required=false) setter: value=null

--- two Notifier beans (Sms, Email), no @Primary ---
ObjectProvider.getIfAvailable()  : NoUniqueBeanDefinitionException: No qualifying bean of type 'com.ankurm.coredi.injection.Notifier' available: expected single matching bean but found 2: emailNotifier,smsNotifier
ObjectProvider.getIfUnique()     : null
ObjectProvider.stream() classes  : [EmailNotifier, SmsNotifier]
ObjectProvider.orderedStream()   : [SmsNotifier, EmailNotifier]
Optional<Notifier> with two beans: FAILED NoUniqueBeanDefinitionException
  No qualifying bean of type 'com.ankurm.coredi.injection.Notifier' available: expected single matching bean but found 2: emailNotifier,smsNotifier