Скачать или смотреть Resolving the HHH000183 Hibernate Error in Quarkus with Panache

Discover how to fix the common Hibernate error `HHH000183` when using Quarkus with Panache by adjusting your datasource configuration.
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This video is based on the question https://stackoverflow.com/q/69092301/ asked by the user 'Chavjoh' ( https://stackoverflow.com/u/4306356/ ) and on the answer https://stackoverflow.com/a/69092302/ provided by the user 'Chavjoh' ( https://stackoverflow.com/u/4306356/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the HHH000183 Hibernate Error in Quarkus with Panache

If you're developing an application with Quarkus and using Hibernate alongside Panache, you might encounter a frustrating error: HHH000183: no persistent classes found for query class. This can occur when attempting to retrieve data from your entities but receiving an empty list instead. Let's dive deep into understanding this issue and how to resolve it effectively.

Understanding the Problem

The error message you see in the console indicates that Hibernate could not find any persistent classes for the specified query, specifically related to your entity class. In the case you've presented, the relevant entity is TeamEntity, which you defined using the -Entity annotation. This is a fundamental requirement for Hibernate to recognize the class as a persistent entity; however, the error suggests that something is not quite right with the configuration.

Key Points of the Setup

From your description of the application, here’s a brief overview of the configuration:

You have defined your entity (TeamEntity) correctly using the -Entity and -Table annotations.

Your database properties are configured in application.properties correctly for an Oracle database.

Notably, you do not have a persistence.xml file, which is normal for Quarkus applications that leverage Hibernate.

The Solution: Adjusting the Datasource Configuration

Upon investigation, it turned out that the root cause of the error lies within the configuration of your Quarkus datasource in the application.properties file. Specifically, the way the default schema was being set was leading to Hibernate not detecting your entities.

Original Configuration

The problematic line you had was:

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

This configuration might not have been properly setting the default schema for Hibernate to recognize your entity classes.

Updated Configuration

To resolve the issue, you should replace the above line with:

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

By setting the quarkus.hibernate-orm.database.default-schema, you're explicitly telling Hibernate which schema to use when looking for the defined entities. This is crucial for Hibernate's internal workings, especially in environments where multiple schemas might exist.

Summary of Steps to Fix the Error

Open the application.properties file in your Quarkus project.

Locate the line related to the default schema setting (the one using new-connection-sql).

Replace it with the correct property to set the default schema for Hibernate, as illustrated above.

Restart your application and attempt to list the entities again using the Panache .listAll() method.

Conclusion

This common HHH000183 error stems from how Hibernate interacts with the database's schema configuration. By ensuring your schema is correctly specified for Hibernate, you can effectively resolve this issue and have Hibernate detect your entities without any further complications. If anyone has more insights into Hibernate's entity detection mechanisms, it would be great to share them in the comments below!

Let’s continue to build robust applications with Quarkus, leveraging the power of Hibernate and Panache!