Why Does My Spring JPA App Throw 'No Dialect Mapping for JDBC Type: 1111' with MySQL and How Can I Fix It?

Troubleshooting "No Dialect Mapping for JDBC Type: 1111" in Spring JPA with MySQL

In your Spring JPA application, you encountered the "No Dialect mapping for JDBC type: 1111" exception while creating the Hibernate SessionFactory. Despite configuring the correct MySQL5Dialect, this error persists.

Examining the Problem

The exception suggests that the database is returning a type that the configured dialect (MySQL5Dialect) does not recognize. This is likely related to the JDBC type of 1111, which typically represents a UUID data type.

Solution

The issue can be resolved by modifying your query to cast the UUID column as a varchar type. This can be achieved using the following syntax in your JPQL query:

SELECT Cast(columnName as varchar) id, ...

In your specific case, the updated query would look like this:

@Query(value = "SELECT Cast(stuid as varchar) id, SUM(marks) as marks FROM studs GROUP BY stuid", nativeQuery = true)
List<Student> findMarkGroupByStuid();

Additional Considerations

• Ensure that the query returns the data as a String or character type, not as a UUID data type.
• Consider using a different dialect explicitly tailored for MySQL 5.6 or later, such as MySQLDialect. However, this is generally not necessary with Hibernate 5.2 and later.

By casting the UUID column, your query will return the data in a format that is compatible with the configured dialect. This should resolve the "No Dialect mapping for JDBC type: 1111" error and allow your application to start successfully.

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