SpringBoot fails to deploy after adding .ebextensions for ngingx SSL -[An error occurred during execution of command [app-deploy]]

Question

I have a SpringBoot app that deploys just fine to AWS Beanstalk, and the default nginx proxy works, allowing me to connect via port 80.

Following the instructions here: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/https-singleinstance.html, and verifying with another of my projects that works with this exact config, Beanstalk fails to deploy the app with error:

2020/05/29 01:27:56.418780 [ERROR] An error occurred during execution of command [app-deploy] - [CheckProcfileForJavaApplication]. Stop running the command. Error: there is no Procfile and no .jar file at root level of your source bundle

The contents of my war file are as such:

app.war
    -.ebextensions
        -nginx/conf.d/https.conf
        -https-instance-single.config
        -https-instance.config
    -web-inf/

My config files pass as valid yaml files. (These files are identical to those in the AWS doc, and those that work in other project on mine.)

I am using a single instance, with port 443 set open.

These are the errors reported throughout the various log files:

----------------------------------------
/var/log/eb-engine.log
----------------------------------------
2020/05/29 01:37:53.054366 [ERROR] /usr/bin/id: healthd: no such user
...
2020/05/29 01:37:53.254965 [ERROR] Created symlink from /etc/systemd/system/multi-user.target.wants/healthd.service to /etc/systemd/system/healthd.service.
...
2020/05/29 01:37:53.732794 [ERROR] Created symlink from /etc/systemd/system/multi-user.target.wants/cfn-hup.service to /etc/systemd/system/cfn-hup.service.


----------------------------------------
/var/log/cfn-hup.log
----------------------------------------
ReadTimeout: HTTPSConnectionPool(host='sqs.us-east-1.amazonaws.com', port=443): Read timed out. (read timeout=23)

Answer 1

Taking count @Dean Wookey's answer for Java 11, I have successfully deployed Spring Boot application jar along with .ebextensions folder. I just added maven antrun plug to my maven build configurations and for output I am receiving .zip file, which contains .ebextensions folder and spring Boot .jar file at the same level. Just deploying this final zip file to AWS UI Console.

The following is the maven antrun plugin configuration

....
<plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-antrun-plugin</artifactId>
            <version>1.8</version>
            <executions>
                <execution>
                    <id>prepare</id>
                    <phase>package</phase>
                    <configuration>
                        <tasks>
                            <copy todir="${project.build.directory}/${project.build.finalName}/" overwrite="false">
                                <fileset dir="./" includes=".ebextensions/**"/>
                                <fileset dir="${project.build.directory}" includes="*.jar"/>
                            </copy>
                            <zip destfile="${project.build.directory}/${project.build.finalName}.zip" basedir="${project.build.directory}/${project.build.finalName}"/>
                        </tasks>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
....