Java Spring Boot: How to map my app root (“/”) to index.html?

It would have worked out of the box if you hadn’t used @EnableWebMvc annotation. When you do that you switch off all the things that Spring Boot does for you in WebMvcAutoConfiguration. You could remove that annotation, or you could add back the view controller that you switched off:

@Override
public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("https://stackoverflow.com/").setViewName("forward:/index.html");
}

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