记一次Springboot启动异常

　　启动Springboot项目报以下异常：

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:155) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at hello.Application.main(Application.java:13) [classes/:na]

Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:204) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

    ... 8 common frames omitte

　　很明显是提示Application无法获取ServletWebServerFactory实例，首先要注意，由于Springboot在以往使用Spring都要配置下提供了集成方案，所以最简单的方法就是采用默认的配置，解决方法非常简单，只需在你的启动类中加入@EnableAutoConfiguration，当然你也可以手动配置，如下为自动配置。

package hello;

import org.springframework.boot.CommandLineRunner;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.Bean;

import java.util.Arrays;

@EnableAutoConfiguration

public class Application {

    public static void main(String[] args) {

        SpringApplication.run(Application.class, args);

    }

    @Bean

    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {

        return args -> {

            System.out.println("Let's inspect the beans provided by Spring Boot:");

            String[] beanNames = ctx.getBeanDefinitionNames();

            Arrays.sort(beanNames);

            for (String beanName : beanNames) {

                System.out.println(beanName);

            }

        };

    }

}

　　手动配置请参考官网，地址：https://docs.spring.io/spring-boot/docs/2.0.1.BUILD-SNAPSHOT/reference/html/howto-embedded-web-servers.html#howto-configure-tomcat

　　下面配一个全部手动配置的代码，其中@value标签的内容需要自己写properties文件：

package com.gws.configuration;

import org.apache.catalina.connector.Connector;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;

import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;

import org.springframework.boot.web.servlet.MultipartConfigFactory;

import org.springframework.boot.web.servlet.server.ServletWebServerFactory;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import javax.servlet.MultipartConfigElement;

/**

 * 使用tomcat配置

 *

 * @version

 * @author

 *

 */

@Configuration

public class TomcatConfig {

    @Value("${spring.server.port}")

    private String port;

    @Value("${spring.server.acceptorThreadCount}")

    private String acceptorThreadCount;

    @Value("${spring.server.minSpareThreads}")

    private String minSpareThreads;

    @Value("${spring.server.maxSpareThreads}")

    private String maxSpareThreads;

    @Value("${spring.server.maxThreads}")

    private String maxThreads;

    @Value("${spring.server.maxConnections}")

    private String maxConnections;

    @Value("${spring.server.protocol}")

    private String protocol;

    @Value("${spring.server.redirectPort}")

    private String redirectPort;

    @Value("${spring.server.compression}")

    private String compression;

    @Value("${spring.server.connectionTimeout}")

    private String connectionTimeout;

    @Value("${spring.server.MaxFileSize}")

    private String MaxFileSize;

    @Value("${spring.server.MaxRequestSize}")

    private String MaxRequestSize;

    @Bean

    public ServletWebServerFactory servletContainer() {

        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();

        tomcat.addConnectorCustomizers(new GwsTomcatConnectionCustomizer());

        return tomcat;

    }

    @Bean

    public MultipartConfigElement multipartConfigElement() {

        MultipartConfigFactory factory = new MultipartConfigFactory();

        //  单个数据大小

        factory.setMaxFileSize(MaxFileSize); // KB,MB

        /// 总上传数据大小

        factory.setMaxRequestSize(MaxRequestSize);

        return factory.createMultipartConfig();

    }

    /**

     *

     * 默认http连接

     *

     * @version

     * @author liuyi  2016年7月20日 下午7:59:41

     *

     */

    public class GwsTomcatConnectionCustomizer implements TomcatConnectorCustomizer {

        public GwsTomcatConnectionCustomizer() {

        }

        @Override

        public void customize(Connector connector) {

            connector.setPort(Integer.valueOf(port));

            connector.setAttribute("connectionTimeout", connectionTimeout);

            connector.setAttribute("acceptorThreadCount", acceptorThreadCount);

            connector.setAttribute("minSpareThreads", minSpareThreads);

            connector.setAttribute("maxSpareThreads", maxSpareThreads);

            connector.setAttribute("maxThreads", maxThreads);

            connector.setAttribute("maxConnections", maxConnections);

            connector.setAttribute("protocol", protocol);

            connector.setAttribute("redirectPort", "redirectPort");

            connector.setAttribute("compression", "compression");

        }

    }

}

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记一次Springboot启动异常

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