Скачать или смотреть How to Fix the Hibernate and H2 Issue with JavaFX: No Tables Created

Discover how to resolve the Hibernate configuration issue where tables are not created in your H2 database when building a JavaFX application.
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This video is based on the question https://stackoverflow.com/q/77577095/ asked by the user 'Arzybek' ( https://stackoverflow.com/u/9560002/ ) and on the answer https://stackoverflow.com/a/77583246/ provided by the user 'Arzybek' ( https://stackoverflow.com/u/9560002/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Hibernate and H2 in JavaFX: No Tables Created

When developing a JavaFX application that incorporates a database, it's common to encounter issues with Hibernate not creating tables as expected. A user recently reported a problem where their H2 database was being created but their entity tables were missing. In this guide, we’ll explore the solution, help you understand the underlying causes, and ensure you can set up your Hibernate and H2 integration successfully.

The Problem

The user had set up their JavaFX application with Hibernate to work with an H2 database. Despite their configurations appearing correct, they found that the tables corresponding to the entity classes were not being created. Here's a summary of what was set up:

The dependencies included javax.persistence, h2, and hibernate-core.

A hibernate.cfg.xml configuration file defined the connection properties and specified hibernate.hbm2ddl.auto as update.

The entity class was annotated appropriately but failed to reflect in the database.

Here's the code breakdown for context:

Dependencies in Maven:

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

Hibernate Configuration (hibernate.cfg.xml):

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

Entity Class (TestEntity):

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

The Solution

After examining the issue, there were two main causes identified that can prevent the tables from being created in the database:

1. Incompatible Imports

The first thing to check is the import statements in your entity class. It turns out that instead of importing from javax.persistence, you need to import from jakarta.persistence. Here's the corrected import statement:

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

2. H2 Database Connection Issues

The second issue stemmed from how IntelliJ IDEA handles connections to the H2 database. As it turns out, a standard connection might not function properly for H2 files when not set up in certain ways. Here’s what was necessary to see the database content correctly:

Use H2 GUI: Instead of relying solely on the integrated database view in IntelliJ, download the H2 Database GUI interface.

Launch H2 with Server Mode: You need to start H2 with the AUTO_SERVER=TRUE parameter to allow other applications (like IntelliJ) to connect to the same database file concurrently. You can do this through the command line or by the GUI settings.

Conclusion

By following the steps outlined above, you should now be able to troubleshoot and resolve the issue of Hibernate not creating tables in your H2 database when working on a JavaFX application. Always ensure that the correct dependencies and import statements are used, and consider using the H2 GUI for better insight into your database.

If you encounter any more hurdles, double-check your configuration files and permissions! Happy coding!