Error Messages:

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
.......
Caused by:
             org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
......
Caused by:
             java.lang.ClassCastException: class org.springframework.web.SpringServletContainerInitializer cannot be cast to class javax.servlet.ServletContainerInitializer (org.springframework.web.SpringServletContainerInitializer is in unnamed module of loader org.apache.catalina.loader.WebappClassLoader @1e0295e0; javax.servlet.ServletContainerInitializer is in unnamed module of loader org.codehaus.plexus.classworlds.realm.ClassRealm @3d88e6b9)
......

cause:
I imported the following dependencies in the project’s pom.xml and found that the tomcat7 plugin can’t run
E.g:

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>4.0.1</version>
</dependency>
<dependency>
  <groupId>javax.servlet.jsp</groupId>
  <artifactId>javax.servlet.jsp-api</artifactId>
  <version>2.3.3</version>
</dependency>

Check:

1. Check whether the current port is occupied by the process

2. Check whether there is a problem with the servlet mapping URL path in web.xml

3. Check for dependency conflicts

reason:

The servlet dependent version imported in the current Maven configuration file is too high and incompatible with tomcat7

Solution:

The tomcat7 plug-in in pom.xml can be upgraded to tomcat8

reference:

<pluginRepositories>
  <pluginRepository>
    <id>alfresco-public</id>
    <url>https://artifacts.alfresco.com/nexus/content/groups/public</url>
  </pluginRepository>
  <pluginRepository>
    <id>alfresco-public-snapshots</id>
    <url>https://artifacts.alfresco.com/nexus/content/groups/public-snapshots</url>
    <snapshots>
      <enabled>true</enabled>
      <updatePolicy>daily</updatePolicy>
    </snapshots>
  </pluginRepository>
  <pluginRepository>
    <id>beardedgeeks-releases</id>
    <url>http://beardedgeeks.googlecode.com/svn/repository/releases</url>
  </pluginRepository>
</pluginRepositories>
<build>
  <plugins>
    <plugin>
      <groupId>org.apache.tomcat.maven</groupId>
      <artifactId>tomcat8-maven-plugin</artifactId>
      <version>3.0-r1655215</version>
      <configuration>
        <port>80</port>
        <path>/</path>
      </configuration>
    </plugin>
  </plugins>
</build>

last:

Refresh the Maven management tool, recompile the Maven project, and then start it with tomcat8!