Use Java 8 Optional In Entities And Queries

Description: This application is an example of how is correct to use the Java 8 Optional in entities and queries.

Key points:

• use the Spring Data built-in query-methods that return Optional (e.g., findById())
• write your own queries that return Optional
• use Optional in entities getters
• in order to run different scenarios check the file, data-mysql.sql

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