In this post, we will have a closer look at one of the basic building blocks in the Java ecosystem - the Java ARchive or as it is more known, the JAR file.
We will describe what it is and how to create one.

Reflection is the ability of an application to inspect and modify the code in the system.

If an application can only inspect but not also modify the code then it only has the ability of introspection.

So for an application to be reflective it must also be able to modify its code at runtime.