If you’re working with Hibernate, you may have encountered the error message “Access to DialectResolutionInfo cannot be null when ‘hibernate.dialect’ not set.” This error message occurs when Hibernate is unable to determine the database dialect to use for your application. In this blog post, we will discuss the causes of this error and how to fix it.



Root Cause

The cause of this error is that the ‘hibernate.dialect’ property is not set in your application’s configuration. Hibernate uses the dialect to determine how to interact with the database, such as the syntax of SQL statements. If the dialect is not set, Hibernate will not know how to communicate with the database, causing the error to be thrown.



Solution 1

To fix this error, you need to set the ‘hibernate.dialect’ property in your application’s configuration. The value of this property should be the fully-qualified class name of the dialect you want to use. For example, if you’re using MySQL, the value should be ‘org.hibernate.dialect.MySQLDialect’.

You can set this property in your hibernate configuration file (e.g. hibernate.cfg.xml) or in your application.properties file if you’re using spring boot

# hibernate.cfg.xml
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

# application.properties
hibernate.dialect=org.hibernate.dialect.MySQLDialect

If you’re using other database, you can find the corresponding dialect in the Hibernate documentation.



Solution 2

In addition to setting the ‘hibernate.dialect’ property, it’s also important to ensure that your database connection properties are correctly configured. This includes properties such as ‘hibernate.connection.url’, ‘hibernate.connection.username’, and ‘hibernate.connection.password’. These properties are used by Hibernate to connect to the database, and if they are not set correctly, Hibernate will not be able to establish a connection, causing further errors.



Solution 3

Another possible cause of this error could be that you have an incompatible version of Hibernate or the database driver. Make sure that you are using a version of Hibernate that is compatible with the version of the database you are using. If you are using a newer version of Hibernate with an older version of the database, the dialect may not be recognized, resulting in this error.



Solution 4

It’s also worth to check your classpath and make sure that the dialect class is correctly included, if you are using a custom dialect, the class should be in the classpath.



Summary

In summary, the “Access to DialectResolutionInfo cannot be null when ‘hibernate.dialect’ not set” error occurs when Hibernate is unable to determine the database dialect to use for your application. To fix this error, you need to set the ‘hibernate.dialect’ property in your application’s configuration, with the fully-qualified class name of the dialect you want to use. In addition, it’s also important to ensure that your database connection properties are correctly configured, check for version compatibility and the classpath. By following these steps, you can ensure that Hibernate can communicate with the database and your application will run without errors.



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