druid monitor in Grails3

import com.alibaba.druid.support.http.StatViewServlet
import grails.boot.GrailsApp
import grails.boot.config.GrailsAutoConfiguration
import org.springframework.boot.context.embedded.ServletRegistrationBean
import org.springframework.context.annotation.Bean


class Application extends GrailsAutoConfiguration {

    @Bean
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean reg = new ServletRegistrationBean();
        reg.setServlet(new StatViewServlet());
        reg.addUrlMappings("/druid/*");
        return reg;
    }

    static void main(String[] args) {
        GrailsApp.run(Application, args)
    }
}