From sberlin on March 10, 2011 18:29:13

Problem One

  1) Module binds Foo.
  2) Foo is @ImplementedBy(FooImpl.class)
  3) FooImpl class has a dependency on Bar
  4) Bar is @ImplementedBy(AutoBar.class)
  5) Module binds Bar to ExplicitBar.class
When figuring out the @ImplementedBy for FooImpl, it's creating a JIT binding for AutoBar too, and the getExistingBinding check when doing ExplicitBar sees AutoBar and fails.

InjectorImpl.createUninitializedBinding is called by BindingProcessor.visit(UntargettedBinding).  It ends up checking for @ImplementedBy (and @ProvidedBy) and creates JIT bindings for them.  The JIT bindings then lead to problem two...

Problem Two

If an untargetted binding is @ImplementedBy, its dependencies need to be eagerly creatable.  That is, if
 1) Foo is @ImplementedBy(FooImpl.class)
 2) FooImpl has a dependency on Bar
 3) Bar is explicitly bound in a module AFTER bind(Foo.class) is written
then FAIL, because Bar can't be created when constructing the JIT binding for FooImpl.

Original issue: http://code.google.com/p/google-guice/issues/detail?id=614