There's more...

The behavior would be exactly the same in a Java EE 8 server. You just wouldn't need SeContainerInitializer and would need to change the dependencies to the following:

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>8.0</version>
    <scope>provided</scope>
</dependency>