Just wondering, main.gsp always comes with

<a class="navbar-brand" href="/#">

Does that work for you? I always have to change it to

<a class="navbar-brand" href="${createLink(uri:'/')}">

do you use a context path?

Oh yes. You are right in application.yml

servlet:
                context-path: "/example3"

the default app does not, so thats why