Deploying Spring Boot app on AWS Elastic Beanstalk — getting 502 error

Question

I know, there are a lot of such quesions and answers here, but none of them helped me. I try to install my simple Spring Boot app on AWS Elastic Beanstalk. There is a limitation: it must use .jsp templates, so it's .war, not .jar. If I use predefined Tomcat env on Elastic Beanstalk, everything works fine, but my goal is to use Java env.

When I install my app, its status is getting Degraded and I become 502 when trying to reach the url.

Locally everything works perfect.

I changed port in application.properties to 5000, but it didn't help. I found a recommendation to use a security rule for inbound for TCP Port 5000 "0.0.0.0/32" but it didn't help eather.

Here are my pom.xml dependencies:

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

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jdt.core.compiler</groupId>
            <artifactId>ecj</artifactId>
            <version>4.6.1</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

application.properties:

spring.mvc.view.prefix=/WEB-INF/view/
spring.mvc.view.suffix=.jsp
server.port=5000

Main Java class:

@SpringBootApplication
public class DemowebApplication extends SpringBootServletInitializer {

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

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

}

AWS error logs:

2019/05/07 21:04:45 [error] 7827#0: *19 connect() failed (111: Connection refused) while connecting to upstream, client: 91.232.158.8, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:5000/", host: "my-endpoint-tst.us-east-2.elasticbeanstalk.com"
2019/05/07 21:04:46 [error] 7827#0: *19 connect() failed (111: Connection refused) while connecting to upstream, client: 91.232.158.8, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:5000/favicon.ico", host: "my-endpoint-tst.us-east-2.elasticbeanstalk.com", referrer: "my-endpoint-tst.us-east-2.elasticbeanstalk.com/"

I suspect that problem is with my Tomcat configuration, but all my experiments with it didn't help yet.