After studying many years, I’ve figured out that the professional world is far from the study. What I’ve learned studying didn’t prepare me for the professional world. Here are some of the main concepts I first learned when I landed in my first job.
Object Oriented Programming
It seems pretty obvious, but when creating a big application, this is a concept we usually skip.
With the Dependency Injection of Spring, everything goes to a service, to a dedicated method.
But when things go complex, the dedicated methods also goes complex.
A solution to that is the Object Oriented Programming.
Every time I have a complex feature to develop, I create a Handler. I separate object with a context and its behavious inside.
Nothing more, no Spring service, no repository. No dependencies at all.
And more, it’s easier to add unit tests
Java Streams
From Java 8, the Stream are a must-know in the Java world.
A new Java developer should know the Streams very well, the filter operations, the map operations, and the reduce and aggregate operations.
The Spring ecosystem
Almost Spring Boot to start.
- What is a controller
- What is a service
- What is a repository
- What is a component
- Some security configuration
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The Dev World - Sergio Lema 
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