boot-time.md

With EnableAutoConfigration

2.676 sec to boot.

2018-06-21 04:01:39.125  INFO 15515 --- [           main] com.example.demo.DemoApplicationKt       : Started DemoApplicationKt in 2.676 seconds (JVM running for 2.984)

Without EnableAutoConfiguration

1.548 sec to boot.

2018-06-21 03:59:24.371  INFO 15117 --- [           main] com.example.demo.DemoApplicationKt       : Started DemoApplicationKt in 1.548 seconds (JVM running for 1.83)

NoEnableAutoConfiguration.kt

package com.example.demo

import org.springframework.boot.CommandLineRunner
import org.springframework.boot.SpringBootConfiguration
import org.springframework.boot.autoconfigure.AutoConfigurationPackages
import org.springframework.boot.autoconfigure.ImportAutoConfiguration
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration
import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration
import org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration
import org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration
import org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration
import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration
import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration
import org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration
import org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration
import org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration
import org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration
import org.springframework.boot.autoconfigure.web.servlet.*
import org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
import org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration
import org.springframework.boot.runApplication
import org.springframework.context.ApplicationContext
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.ComponentScan
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RestController

@RestController
class ExampleController {
    @GetMapping("/")
    fun hello(): String = "Hello, world!!"
}

@SpringBootConfiguration
@ImportAutoConfiguration(
        //AutoConfigurationPackages::class,
        //ConfigurationPropertiesAutoConfiguration::class,
        //PropertyPlaceholderAutoConfiguration::class,
        //HttpMessageConvertersAutoConfiguration::class,
        //CodecsAutoConfiguration::class,
        //ProjectInfoAutoConfiguration::class,
        //JacksonAutoConfiguration::class,
        //JmxAutoConfiguration::class,
        //ReactiveSecurityAutoConfiguration::class,
        //ValidationAutoConfiguration::class,
        //RestTemplateAutoConfiguration::class,
        //EmbeddedWebServerFactoryCustomizerAutoConfiguration::class,
        DispatcherServletAutoConfiguration::class,
        //HttpEncodingAutoConfiguration::class,
        //MultipartAutoConfiguration::class,
        ServletWebServerFactoryAutoConfiguration::class
        //WebMvcAutoConfiguration::class,
        //ErrorMvcAutoConfiguration::class,
        //WebSocketServletAutoConfiguration::class
)
@ComponentScan
//@SpringBootApplication
private class DemoApplication {
    /*
    @Bean
    fun commandLineRunner(ctx: ApplicationContext): CommandLineRunner {
        return CommandLineRunner {

            println("Let's inspect the beans provided by Spring Boot:")

            val beanNames = ctx.beanDefinitionNames
            beanNames.sort()
            for (beanName in beanNames) {
                println(beanName)
            }
        }
    }
    */
}

fun main(args: Array<String>) {
    runApplication<DemoApplication>(*args)
}