How Is Docker Different Than JVM?

The JVM is Java’s solution for application portability across different platforms — but Docker provides a different kind of virtualization that makes use of the guest operating system libraries, not just the Java application.
When a Docker container is launched, a filesystem is allocated, along with the network/bridge interface and IP address.
The command (or script) specified in the Dockerfile used to build the underlying Docker image is then executed, and the resulting Linux process runs in isolation.
As a result, Docker can be used to package an entire JVM along with the JAR or WAR files and other parts of the application into a single container that can run on any Linux host consistently.
This eliminates some of the challenges associated with making sure that the right JAR file version is used on the right JVM.
Moreover, CPU and memory resource controls can be used with Docker containers — allowing users to allocate maximum amounts of resources that an application can use.
A hypervisor, also known as a virtual machine monitor or VMM, is software that creates and runs virtual machines (VMs). A hypervisor allows one host computer to support multiple guest VMs by virtually sharing its resources, such as memory and processing.
A container engine is a piece of software that accepts user requests, including command line options, pulls images, and from the end user’s perspective runs the container.