Spring Boot Custom Error Page Stack Trace

I have found on several locations how to use Spring boot to make a custom error page but I cannot seem to figure out how to make it show a stack trace.

This is what I have:

@Bean
public EmbeddedServletContainerCustomizer containerCustomizer() {

    return new EmbeddedServletContainerCustomizer() {
        @Override
        public void customize(ConfigurableEmbeddedServletContainer container) {

            ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/WEB-INF/jsp/app/404.jsp");
            ErrorPage error500Page = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/WEB-INF/jsp/app/500.jsp");

            container.addErrorPages(error404Page, error500Page);
        }
    };
}

Any ideas how I could figure this out or how to get the stack trace to begin with?

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