记一次Springboot启动异常

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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");
}
}
}