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Discover how to handle JSON data in PostgreSQL with Spring Boot, including effective techniques to convert JSON arrays for storage.
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How to Save a JSON Array into PostgreSQL Using Spring Boot Java API

When working with web applications, especially those that require data storage and management, you might often find yourself needing to handle JSON data effectively. Today, we will dive into a specific problem: how to save a JSON array in a PostgreSQL database using a Spring Boot Java API.

The Problem

Suppose you have a JSON array included in your request object. Here is a typical example:

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You need to save this product array into a jsonb column of your PostgreSQL table. However, you're encountering the following exception when attempting to hit your API via Postman:

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This error indicates that there is an issue with the way the JSON data is being handled by the R2DBC (Reactive Relational Database Connectivity) framework in Spring Boot.

The Solution

To resolve this issue, you need to create custom converters that read from and write to the PostgreSQL jsonb data type. These converters will help convert between your custom data model and the PostgreSQL JSON type.

Step 1: Create the Converters

You will need two converters: one for reading the JSON into your custom type and another for writing your custom type back to JSON.

1.1 Reading Converter

The first step is to create a reading converter.

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1.2 Writing Converter

Next, create a writing converter for your custom type.

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Step 2: Register the Converters

After defining the converters, the next step is to register them using the R2dbcCustomConversions bean.

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Conclusion

By implementing the above converters and registering them as a bean, you enable your Spring Boot application to handle JSON data effectively, overcoming the exceptions encountered when trying to save a JSON array to PostgreSQL. This approach not only enhances data handling but also ensures that your application adheres to best practices in terms of data management.

If you follow these steps, you can seamlessly store JSON data in your PostgreSQL database and take full advantage of the capabilities provided by Spring Boot and R2DBC!

Feel free to reach out if you have any questions or run into any issues!