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How To Use Optionals in Java

How To Use Optionals in Java
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Alternatives to DTO - DZone Java

Learn about the problems with DTOs and some potential alternatives to them, including Jackson, JPA, and GraphQL. ....

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Avoiding NullPointerException - DZone Java


Avoiding NullPointerException
In this article, we ll explore the main techniques to fight it: the self-validating model and the Optional wrapper.
by
The terrible
NullPointerException (NPE in short) is the most frequent Java exception occurring in production, according to a 2016 study. In this article, we ll explore the main techniques to fight it: the self-validating model and the
Optional wrapper.
Self-Validating Model
Imagine a business rule: every Customer has to have a birth date set. There are a number of ways to implement this constraint: validating the user data on the create and update use-cases, enforcing it via
NOT NULL database constraint and/or implementing the null-check right in the constructor of the Customer entity. In this article, we ll explore the last one. ....

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