spring boot war 部署到 tomcat，状态为：OK 但访问时出现 404

我的配置类如下所示

@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages = "com.projectx")

public class Application extends SpringBootServletInitializer{

    public static void main(String[] args) {

        SpringApplication.run(applicationClass, args);

    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }
}

Also build.gradle文件看起来像这样

apply plugin: 'java'
sourceCompatibility=1.8
targetCompatibility=1.8

apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'
apply plugin: 'war'


mainClassName = 'com.projectx.data.config.Application'

buildscript {
    repositories {
        maven { url "http://repo.spring.io/libs-release" }
        mavenLocal()
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.1.RELEASE")
    }
}




war {
    baseName = 'gs-accessing-data-jpa'
    version =  '0.1.0'
}

repositories {
    mavenLocal()
    mavenCentral()
    maven { url "http://repo.spring.io/libs-release" }
    maven { url "https://repository.jboss.org/nexus/content/repositories/releases" }
}

configurations {

    providedRuntime

}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web")
    providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")

}

因此，无论我将这个项目部署到 tomcat，它都会显示以下错误。因为我已经满足了在春季将 jar 转换为 war 的所有要求，所以不确定我的项目出了什么问题。

它给出 404 NOT FOUND。（我使用带有 Gradle 插件的 STS 3.6.0）