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Circular dependencies can be setup cleanly in Butterfly DI Container like this:

beanA = com.myapp.A(b = * com.myapp.B());
config{ $b.setA($beanA); }

when you obtain A it will contain a B, and B will have it's A set on it using setA();

... or you could just have the factory call a static method that wires up A and B correctly for you. No proxies like Guice does... and far better performance. This circular dependency check is according to Bob Lee one of the performance "killers" of Guice, and probably the main reason why Butterfly is so much faster than Guice.

But with Butterfly, B needs to be mutable.,