@Bean
public EmbeddedServletContainerCustomizer cookieProcessorCustomizer() {
    return new EmbeddedServletContainerCustomizer() {
        @Override
        public void customize(ConfigurableEmbeddedServletContainer container) {
            if (container instanceof TomcatEmbeddedServletContainerFactory) {
                TomcatEmbeddedServletContainerFactory factory = (TomcatEmbeddedServletContainerFactory) container;
                factory.addContextCustomizers(new TomcatContextCustomizer() {
                    @Override
                    public void customize(Context context) {
                        context.setCookieProcessor(new LegacyCookieProcessor());
                    }                        
                });
            }
        }

    };
}
 

@Bean
public WebServerFactoryCustomizer<TomcatServletWebServerFactory> cookieProcessorCustomizer() {
    return factory -> factory.addContextCustomizers(context -> context.setCookieProcessor(new LegacyCookieProcessor()));
}