How to add default methods to Guice interface

Question

I've got the following interface:

public interface FooFactory {

    Foo create();



    default Foo createWithData(Data data){

        Foo foo = create();

        foo.addData(data);

        return foo;

    }

}

I'm installing it as follows:

install(new FactoryModuleBuilder().build(FooFactory.class));

However, the problem is that Guice overwrites my default method with its own factory method. The Foo I get back is the same Foo from

create()

(no data has been set). The default method never gets called.

Now, this is simply a convenience method, but is it possible for me to tell Guice not to overwrite my function?

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Answer 1

the guice-assistedinject module has a bug for skipping the java-8 default method at line L252. and I found there is no tests to testing this feature.

a default method is neither a bridge method nor a synthetic method at all in java complier. However, its comments says that will skips the default methods. and the code should be as:

if (isDefault(method)){
  ...
}

you need to write your own Provider instead.

How to add default methods to Guice interface

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