Java - Modularization and Java9 JSR

Recently I've seen good talk from Milen Dyankov about Modularity in general and place of Java 9 in it.

Two slides from hist talk are perfectly depicts a main topic: 

 

• Level#1: Monolith - just JAR in Java  or DLL in C#
• Level#2: Composite - description of JAR/DLL dependencies which can be resolved. Package Manager:
• Maven in Java
• NuGet in C#
• NPM, Bower in Javascript
• Level #3: Containers - Dependency Injection/IoC frameworks which works regardless JARs/DLLs:
• Spring, CDI, Castle Windsor,Structure Map and tons of other frameworks.
•  Level #4,5:Discovery and micro-Services
• OSGi - ONLY
• MicroServices here - its a same functionality but works inside SAME JVM/process.
• Its level rarely need for Apps, but some big apps use it: 
• IDEs (Eclipse, Netbeans),  
• Java EE servers (Apache TomEE, JBoss, GlassFish, Apache Geromino).
• Extendable Applications: like Liferay
• Embedded solution witch want to do on-line reload/upgrades

Below Java 9 (JSR 376) place:

• Just implement simple things
• Perfectly reasonable for JDK itself - so its more splitting JDK on modules
• Surprise! It was NOT a goal to provide feature-full modules on Java Language level :(
• Very basic APIs
• Just Module Names
• No versions
• No interfaces/Contract support - you should believe that particular Class/Interface are in those Module.
• You wanted more - use OSGi :)

Here is a full talk itself: