Is it possible to use a Spring Bean in a Condition?

Question

I would like to create a Condition which uses a special Bean. Is it possible?

i.e. something like this:

@Component
public class MyCondition implements Condition{

    @Autowired
    MyBean myBean;

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        return myBean.isTrue();
    }
}

I.e. in some cases I have to get a database session bean and check something in a database before I can say if the condition is true or false.
I need that condition to be used with @Conditional annotation then. I.e. :

@Conditional(MyCondition.class)
@Configuration
public class Config{
//...
}

Answer 1

No you can't. As it says in the documentation this is because it might

cause premature bean instantiation, violating the container and causing unintended side-effects

so in your case, if your condition references a DB bean, the DB might get instantiated before the container is able to fulfil its preconditions.