記一次Springboot啟動異常

標籤：gap   tomcat   自己   mis   actor   missing   簡單   vax   min   

　　啟動Springboot項目報以下異常：

　　

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

　　很明顯是提示Application無法擷取ServletWebServerFactory執行個體，首先要注意， 由於Springboot在以往使用Spring都要配置下提供了整合方案，所以最簡單的方法就是採用預設的配置，解決方案非常簡單，只需在你的啟動類中加入@EnableAutoConfiguration，當然你也可以手動設定，如下為自動設定。

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;@EnableAutoConfigurationpublic 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);            }        };    }}

　　手動設定請參考官網，地址：https://docs.spring.io/spring-boot/docs/2.0.1.BUILD-SNAPSHOT/reference/html/howto-embedded-web-servers.html#howto-configure-tomcat

　　下面配一個全部手動設定的代碼，其中@value標籤的內容需要自己寫properties檔案：

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  *  */@Configurationpublic 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();        //  單個資料大小        factory.setMaxFileSize(MaxFileSize); // KB,MB        /// 總上傳資料大小        factory.setMaxRequestSize(MaxRequestSize);        return factory.createMultipartConfig();    }    /**     *     * 預設http串連     *     * @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");        }    }}

 

記一次Springboot啟動異常