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
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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