Switch from Postgres to H2

This commit is contained in:
Ali Dehghani
2019-10-28 22:12:19 +03:30
parent db85c8f275
commit c4da87f511
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## Core Java Optional
### Relevant Articles:
- [Java Optional as Return Type](https://www.baeldung.com/java-optional-return)
- [Guide To Java 8 Optional](https://www.baeldung.com/java-optional)
- [Java Optional orElse() vs orElseGet()](https://www.baeldung.com/java-optional-or-else-vs-or-else-get)