In layman terms (and I’m sure some could consider this an over-simplification, as there are much more complex explanations to be had), the Lucee servlet is the “app" that runs within the servlet container, which is the “app" that runs within the “app" that is the JRE.
Your CFML code is the smallest “doll” in the Java Russian nesting doll, if you will. Each “doll” introduces shared language, classes and conventions along the way that the nested applications/servlets can take advantage of. You wouldn’t want those all in the language, itself, because their purposes, classes and conventions are not universal to all of the potential use-cases of the language.
In short, Lucee introduces, via the JRE first and then the servlet container, the shared conventions through which a translation from CFML to the top-level language is possible. Without the nested “doll” the final step of translation is impossible.
JonOn April 1, 2016 at 4:32:50 PM, Brian FitzGerald (@Brian_FitzGerald) wrote:
I realize this probably sounds like a ridiculous question, but I’m going to ask it anyway. For the layman (aka cfml/lucee-script developer), leaving buzzwords aside, why is the “servlet container” necessary in the world of lucee (and other languages built on top of Java)?
If the JVM process java bytecode, and Lucee compiles lucee script into java bytecode, then why do we need Tomcat? I realize that it “implements several Java EE specifications,” but that doesn’t help my understanding (as a layman). Could Tomcat (and the specifications it implements) be considered an “extension” of the Java, much like the Lucee 5 “core” will only implement a subset of language features, with additional features (i.e. image processing, or pdf processing, or whatever) only available as “extensions” to that core?
In plain English, what exactly does Tomcat provide that Java itself doesn’t already offer, and why doesn’t Java implement those specifications on its own?? Help me wrap my melon around this please. Google seems to offer very little beginner friendly content to “introduction to tomcat.” Thank you Java/Tomcat/Lucee enlightened warriors.
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