{{ extension_alias }}_homepage:
    pattern:  /hello/{name}
    defaults: { _controller: {{ bundle }}:Default:index }

{{ extension_alias }}_homepage:
    path:  /hello/{name}
    defaults: { _controller: {{ bundle }}:Default:index }

Use "path" instead of "pattern" in the routing definitions
Use "path" instead of "pattern" in the routing definitions

The docs (http://symfony.com/doc/current/book/routing.html) mention `path` as being the new option.