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之前根据视频写的代码第一次运行没出问题，然后关闭软件后再重启就一直报错
2021-06-08 11:59:19.400 INFO 11216 --- [ main] com.shou.Springboot04DataApplication : Starting Springboot04DataApplication using Java 1.8.0_281 on LAPTOP-J8B3TOHQ with PID 11216 (G:\JAVA_code\SpringBoot\springboot-04-data\target\classes started by lenovo in G:\JAVA_code\SpringBoot\springboot-04-data)
2021-06-08 11:59:19.404 INFO 11216 --- [ main] com.shou.Springboot04DataApplication : No active profile set, falling back to default profiles: default
2021-06-08 11:59:20.431 INFO 11216 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-06-08 11:59:20.443 INFO 11216 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-06-08 11:59:20.443 INFO 11216 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.45]
2021-06-08 11:59:20.508 INFO 11216 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-06-08 11:59:20.509 INFO 11216 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1045 ms
2021-06-08 11:59:20.540 ERROR 11216 --- [ main] o.s.b.web.embedded.tomcat.TomcatStarter : Error starting Tomcat context. Exception: java.lang.IllegalArgumentException. Message: Filter must not be null
2021-06-08 11:59:20.554 INFO 11216 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2021-06-08 11:59:20.565 WARN 11216 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
2021-06-08 11:59:20.573 INFO 11216 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-06-08 11:59:20.594 ERROR 11216 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.6.jar:5.3.6]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:782) [spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:774) [spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439) [spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:339) [spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1340) [spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1329) [spring-boot-2.4.5.jar:2.4.5]
at com.shou.Springboot04DataApplication.main(Springboot04DataApplication.java:10) [classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:142) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:450) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:199) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:159) ~[spring-boot-2.4.5.jar:2.4.5]
... 9 common frames omitted
Caused by: java.lang.IllegalArgumentException: Filter must not be null
at org.springframework.util.Assert.notNull(Assert.java:201) ~[spring-core-5.3.6.jar:5.3.6]
at org.springframework.boot.web.servlet.AbstractFilterRegistrationBean.getDescription(AbstractFilterRegistrationBean.java:203) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.servlet.RegistrationBean.onStartup(RegistrationBean.java:48) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:234) ~[spring-boot-2.4.5.jar:2.4.5]
at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:53) ~[spring-boot-2.4.5.jar:2.4.5]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_281]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_281]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_281]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_281]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:433) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.4.5.jar:2.4.5]
... 14 common frames omitted
就是会一直报错，试了很多方法也不行，网上查是因为tomcat的包冲突，但是不会改怎么办呀
pom配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.shou</groupId>
<artifactId>springboot-04-data</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-04-data</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.6</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
求各位大神帮我！！！！！！
后续加上我的源码，不知道哪里错了呀，新手不太懂springboot自动配置的源码，断点调试也只会一些简单代码，-.-，java好难！！！！！
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druidDataSource(){
return new DruidDataSource();
}
//后台监控功能
//因为SpringBoot内置了servlet容器，所以没有web.xml
//替代方法就是使用ServletRegistrationBean
@Bean
public ServletRegistrationBean servletRegistrationBean(){
ServletRegistrationBean<Servlet> bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");
//后台需要有人登录，账号密码配置
Map<String, String> map = new HashMap<>();
//增加配置
map.put("loginUsername","admin");//登录的key值是固定的loginUsername和loginPassword
map.put("loginPassword","123456");
//允许访问权限
map.put("allow","");
//禁止访问权限
//map.put("shou","192.168.11.123");
//设置初始化参数
bean.setInitParameters(map);
return bean;
}
//过滤
@Bean
public FilterRegistrationBean filterRegistrationBean(){
FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();
//map存放过滤的原则
Map<String, String> map = new HashMap<>();
//这些资源不进行过滤
map.put("exclusions","*.js,*.css,/druid/*");
//设置初始化参数
bean.setInitParameters(map);
return bean;
}
}改了之后又变成这样了，太难了
2021-06-09 22:00:16.032 INFO 12196 --- [ main] com.shou.Springboot04DataApplication : Starting Springboot04DataApplication using Java 1.8.0_281 on LAPTOP-J8B3TOHQ with PID 12196 (G:\JAVA_code\SpringBoot\springboot-04-data\target\classes started by lenovo in G:\JAVA_code\SpringBoot\springboot-04-data)
2021-06-09 22:00:16.037 INFO 12196 --- [ main] com.shou.Springboot04DataApplication : No active profile set, falling back to default profiles: default
2021-06-09 22:00:17.406 INFO 12196 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-06-09 22:00:17.420 INFO 12196 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-06-09 22:00:17.420 INFO 12196 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.45]
2021-06-09 22:00:17.511 INFO 12196 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-06-09 22:00:17.512 INFO 12196 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1371 ms
2021-06-09 22:00:17.864 INFO 12196 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2021-06-09 22:00:18.068 INFO 12196 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-06-09 22:00:18.078 INFO 12196 --- [ main] com.shou.Springboot04DataApplication : Started Springboot04DataApplication in 2.767 seconds (JVM running for 3.857)
2021-06-09 22:00:18.247 INFO 12196 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-06-09 22:00:18.248 INFO 12196 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2021-06-09 22:00:18.249 INFO 12196 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
试了下你这个配置，没有报错，你可以先清下缓存什么的试试。
日志说的AbstractFilterRegistrationBean这个类的getDescription方法里面获取的filter是空，这个filter来自于子类FilterRegistrationBean。FilterRegistrationBean有两个构造方法，一个空的，一个要注入filter，但注入filter的构造器也会判断是不是空。所以只可能使用的无参构造器，但只有Jersey相关的组件存在时才使用这个无参构造器的创建。你可以在FilterRegistrationBean的两个构造器里面打个断点，或者AbstractFilterRegistrationBean.getDescription打个断点看看，FilterRegistrationBean到底是怎么创建的，filter有没有被设置。当然你要是能提供源码就更方便了。
这个主页是哪个主页？自己写的，还是druid的。页面进不去的情况太多了，而且这个日志也没报错，没法判断啊。
还有你要大致知道springboot的自动配置原理。因为我看了下druid的自动配置类，你这三个配置在自动配置类里面都有，这样配置就行了。