Скачать или смотреть Resolving the Cannot resolve method 'type' Error in Spring Boot 3 with PostgreSQL

Learn how to fix the frequently encountered error "Cannot resolve method 'type'" when upgrading your Spring Boot application that utilizes PostgreSQL. This guide provides step-by-step solutions and tips for handling avatar storage in your database.
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This video is based on the question https://stackoverflow.com/q/75794270/ asked by the user 'Patrick Lange' ( https://stackoverflow.com/u/21441680/ ) and on the answer https://stackoverflow.com/a/75799837/ provided by the user 'Deon Slabbert' ( https://stackoverflow.com/u/2858940/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Cannot resolve method 'type' Error in Spring Boot 3 with PostgreSQL

Upgrading projects from Spring Boot 2.7 to Spring Boot 3 can lead to unexpected issues, especially when it comes to how data is handled in databases. One common problem developers face is the "Cannot resolve method 'type'" error when dealing with entity mappings. This guide aims to provide an in-depth solution to this issue through a focused example of storing avatars in a PostgreSQL database.

Understanding the Problem

As developers move from Spring Boot 2.7 to Spring Boot 3, they might encounter errors due to changes in underlying libraries or deprecated features. The error in question arises when trying to define the type of a database column using annotations that were valid in the older version but are no longer recognized in Spring Boot 3.

Example Scenario

In your Java project, you might have a code snippet like the following in an entity class for storing avatar images:

[[See Video to Reveal this Text or Code Snippet]]

During the upgrade, this coding style leads to the error:

[[See Video to Reveal this Text or Code Snippet]]

How to Solve the Problem

Step 1: Updating Your Code Annotations

The main fix for the issue lies in switching the use of the @ Type annotation to a more compatible alternative. Specifically, you need to use @ JdbcTypeCode to specify the correct type for large objects stored in your PostgreSQL database.

Revised Code

Change your code from:

[[See Video to Reveal this Text or Code Snippet]]

to:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Understanding @ JdbcTypeCode

The @ JdbcTypeCode annotation allows you to specify the SQL type of the underlying column, making it more compatible with Spring Boot 3.

In this case, Types.LONGVARCHAR is used to accommodate large data, which is suitable for handling image files.

Step 3: Testing After Migration

After making these changes, ensure you:

Clean and rebuild your project to clear any previous compile-time errors.

Run your application to check if the error persists.

Monitor the behavior for any potential issues during runtime, especially when retrieving and displaying avatars.

Conclusion

Upgrading your Spring Boot project can introduce several challenges, but understanding how to adapt to changes can alleviate many problems. By switching from the deprecated @ Type annotation to the more modern @ JdbcTypeCode, you should be able to fix the "Cannot resolve method 'type'" error effectively.

In summary, remember these key points for a seamless transition to Spring Boot 3:

Update your entity annotations to reflect the new standards.

Verify your application after every change to catch new issues early on.

Following this guide should help you get your project back on track and ensure your database operations continue to run smoothly. If you encounter further issues, don't hesitate to reach out to the community or consult additional resources.