Unable to start embedded Tomcat

plugins {
    id 'org.springframework.boot' version '2.2.0.RELEASE'
    id 'io.spring.dependency-management' version '1.0.8.RELEASE'
    id 'java'
}
 
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
 
configurations {
    developmentOnly
    runtimeClasspath {
        extendsFrom developmentOnly
    }
}
 
repositories {
    mavenCentral()
}
 
ext {
    set('vaadinVersion', "14.0.9")
}
 
dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'com.vaadin:vaadin-spring-boot-starter'
    developmentOnly 'org.springframework.boot:spring-boot-devtools'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
}
 
dependencyManagement {
    imports {
        mavenBom "com.vaadin:vaadin-bom:${vaadinVersion}"
    }
}
 
test {
    useJUnitPlatform()
}

@SpringBootApplication
public class WeatherApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(WeatherApplication.class, args);
    }
}