Configuration injection is not optional

[GuiSim]

  @Inject
  private Configuration configuration = null;

The documentation mentions that providing a Configuration instance is optional but that is not the case. In order to declare an Inject as optional, you need to use @Inject(optional=true). It should also probably be @Nullable.

See https://github.com/google/guice/wiki/Injections#optional-injections

If you agree, I'll do a pull request with a fix.

EDIT: The same seems true for Settings

[supercargo]

Yes, thank you for the report. Happy to take a look at a PR.