Setting Default Values in POJO Class in Java Spring Boot

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Summary: Learn how to set default values in Plain Old Java Object (POJO) classes in a Spring Boot application. This guide covers various techniques to initialize default values in POJO classes, providing clarity on the approaches and their implementation within the Spring Boot framework.
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When working with Plain Old Java Object (POJO) classes in a Spring Boot application, you might encounter scenarios where you need to set default values for certain fields. Setting default values ensures that your application behaves predictably even when input data is missing or incomplete. Here are several techniques to achieve this:

Constructor Initialization
One of the simplest ways to set default values is by initializing them in the constructor of your POJO class. For example:

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Setter Methods
Another approach is to use setter methods to set default values. This allows flexibility in changing default values at runtime if needed:

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Field Initialization
You can directly initialize default values when declaring the fields in your POJO class:

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Using @Value Annotation

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Using Lombok @Builder Annotation
If you're using Lombok in your Spring Boot project, you can utilize the @Builder annotation to set default values:

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This approach generates a builder that allows you to set default values when constructing the object.

Conclusion
Setting default values in POJO classes is a common requirement in Java Spring Boot applications. Whether you prefer constructor initialization, setter methods, field initialization, annotations like @Value, or Lombok's @Builder, there are various approaches to achieve this goal. Choose the method that best fits your project's requirements and coding style.