Скачать или смотреть Why Your JPA Delete Might Not Execute: A Guide to Handling Exceptions in Spring Boot

Learn why a delete operation in JPA might not execute when an exception is thrown, and how to utilize Spring Boot's -Transactional annotation effectively.
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This video is based on the question https://stackoverflow.com/q/69106383/ asked by the user '256' ( https://stackoverflow.com/u/9655117/ ) and on the answer https://stackoverflow.com/a/69106620/ provided by the user 'Gaurav Jeswani' ( https://stackoverflow.com/u/4762502/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: JPA Delete Not Executed

You might encounter a situation where a delete operation using Java Persistence API (JPA) does not work as expected. This issue often arises when an exception is thrown directly after the delete call. If you've found yourself puzzled by this behavior in your Spring Boot application, you’re not alone. Let's break down the issue and identify the solution to ensure your delete operations run smoothly even when exceptions occur.

The Scenario

Consider the following code snippet which illustrates a common pattern where an attempt is made to delete a refresh token if it is expired:

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In this case, if the token has expired, the method delete() is called to remove it, and immediately after, a TokenException is thrown. The expectation might be that the delete operation completes successfully, but often this is not the case.

The Solution: Utilizing -Transactional with noRollbackFor

The core of this issue lies within transaction management in Spring Boot. By default, if a method annotated with -Transactional throws a runtime exception, Spring handles this by rolling back the transaction. Thus, if you're trying to delete something and then throw an exception, the delete operation will not take effect because the transaction is rolled back.

Applying the noRollbackFor Annotation

To address this, you can adjust your transaction behavior by using the noRollbackFor attribute on the -Transactional annotation. Here’s how you can implement it:

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Step-by-Step Breakdown

Declare Your Transaction: Use the -Transactional annotation at the beginning of your method to indicate that the method will involve database operations.

Configuring noRollbackFor: Specify that you do not want to rollback transactions if a TokenException is thrown. This allows your delete operation to succeed even if the exception is encountered afterward.

Execute Your Logic: Within your method, you can safely perform the delete operation. If the token is indeed expired, it gets deleted, and the exception can be thrown without affecting that outcome.

Conclusion

By utilizing the noRollbackFor attribute in your -Transactional annotations, you can ensure that your delete operations can complete even when exceptions are thrown shortly after. This is crucial for maintaining the integrity of your application's data manipulation operations.

Keep this pattern in mind when working with JPA in Spring Boot; it can be a lifesaver in managing transactions effectively!