As we all know, Docker containers are a fantastic way to optimally and organically encapsulate complex build processes. Typically, any software package requires a host of dependencies. As indicated in Chapter 9, Microservices Architecture Patterns, every microservice is being developed and delivered as a Docker image. Each microservice has its own code repository (GitHub) and its own CI build job. Microservices can be coded using any programming language. Let us focus on the Java language here. If a service is built and run using a compiled language (Java, Go, and so on), then the build environment can be separated from the runtime environment. A Java service's Dockerfile.build is from the openjdk-7-jdk directory and its Dockerfile is from the openjdk-7-jre directory which is substantially smaller than JDK.
For the Java programming language...
