Getting error while running application deployed as war on Tomcat

Question

I need to convert an application to war and run it via Tomcat. I made the application war with maven. But when I upload this war file to tomcat and try to run it on localhost, I get an error like this.

Can you help me with this?

The application link https://github.com/spring-projects/spring-petclinic

My operating system is Debian.

In tomcat-users.xml I added

<user username="war-deployer" password="maven-tomcat-plugin"
                roles="manager-gui, manager-script, manager-jmx" />

In maven settings.xml I added

<server>
    <id>maven-tomcat-war-deployment-server></id>
    <username>war-deployer</username>
    <password>maven-tomcat-plugin</password>
</server>

In pom.xml i added

  ...
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.springframework.samples</groupId>
  <artifactId>spring-petclinic</artifactId>
  <version>2.7.0-SNAPSHOT</version>
  <packaging>war</packaging>
  ...

        <!-- Configure the Tomcat Maven plugin -->
<plugin>
  <groupId>org.apache.tomcat.maven</groupId>
  <artifactId>tomcat7-maven-plugin</artifactId>
  <version>2.0</version>
  <configuration>
    <url>http://localhost:9090/manager/text</url>
    <path>/rps</path>
  </configuration>
</plugin>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-tomcat</artifactId>
  <scope>provided</scope> <!-- This is important. -->
</dependency>

I'm typing this command via terminal inside of webapps/ folder to get .war

mvn clean package