Adding section about Null safety

jabrena · Oct 27, 2019 · c599c89 · c599c89
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diff --git a/README.md b/README.md
@@ -30,6 +30,12 @@ Or you could use new ones from Reactor to model your Reactive problems:
 
 The following problems was designed to improve your skills modeling solutions.
 
+### Null safety
+
+In Java accept `null` is a valid `value` although is harmful. 
+Using JSR-305 meta-annotations like `@NonNull` or using JSR 303 & JSR 380 Bean validations,
+you could indicate that your programs only accept Non null objects.
+
 Enjoy the journey!
 
 Juan Antonio Breña Moral

diff --git a/REFERENCES.md b/REFERENCES.md
@@ -9,4 +9,7 @@
 - https://mermaidjs.github.io/mermaid-live-editor/
 - https://mermaidjs.github.io/#/classDiagram
 - https://www.manning.com/books/java-8-in-action
+- https://jcp.org/en/jsr/detail?id=305
+- https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/lang/
+- https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/lang/NonNull.html
 - https://projectlombok.org/features/NonNull