Spring Boot War文件在ec2上获得404

我整理了一个简单的Eclipse Spring Boot Rest程序 . 只是几个返回一些字符串的 endpoints . 我正在使用Eclipse Gradle插件构建它 . 没问题，它在Eclipse提供的Tomcat实例中运行良好 . 我也在本机Windows Tomcat上运行它 . 我使用部署功能使用tomcat Web应用程序管理器部署了.war文件 . 运行很好 . 然后我部署了一个ec2 ubuntu实例，并再次使用tomcat Web应用程序管理器并上传.war文件 . 其余程序正确显示在应用程序窗口中，但不会运行 . 我使用了以下网址，

http://ec2-IP-Address/demo-0.0.1-SNAPSHOT/hello

我一直得到404 . 我很确定tomcat部署和ec2环境看起来是正确的，因为我可以在ec2实例中运行tomcat7-examples而没有任何问题 . 任何帮助，将不胜感激 .

AwsElbRestServerAApplication.java文件：

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@SpringBootApplication
public class AwsElbRestServerAApplication {

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

ServletInitializer.java文件：

package demo

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;

public class ServletInitializer extends SpringBootServletInitializer {

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

RestController.java文件：

package demo

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class RestController {

    @RequestMapping("/hello")
    public @ResponseBody String hello() {

        return "Greetings from Server A";
    }

    @RequestMapping("/heartbeat")
    public @ResponseBody String heartbeat() {

        return "Server A is still running";
    }
}

build.gradle文件：

buildscript {
    ext {
        springBootVersion = '1.2.4.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle
        plugin:${springBootVersion}") 
        classpath("io.spring.gradle:dependency-management
        Plugin:0.5.1.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse-wtp'
apply plugin: 'idea'
apply plugin: 'spring-boot' 
apply plugin: 'io.spring.dependency-management' 
apply plugin: 'war'

war {
    baseName = 'demo'
    version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
    jcenter()
    maven { url "http://repo.spring.io/libs-snapshot" }
}

configurations {
    providedRuntime
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-actuator")
    compile("org.springframework.boot:spring-boot-starter-remote-shell")
    compile("org.springframework.boot:spring-boot-starter-web")
    providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")
    testCompile("org.springframework.boot:spring-boot-starter-test") 
}

eclipse {
    classpath {
         containers.remove('org.eclipse.jdt.launching.JRE_CONTAINER')
         containers 'org.eclipse.jdt.launching.JRE_CONTAINER/
         org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/
         JavaSE-1.8'
    }
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.3'
}