Why Does My Spring JPA App with MySQL5Dialect Throw 'No Dialect mapping for JDBC type: 1111'?

'No Dialect mapping for JDBC type: 1111' in MySQL5Dialect

Encountering the 'No Dialect mapping for JDBC type: 1111' error in a Spring JPA application using MySQL can be frustrating. Despite ensuring that essential libraries are loaded and specific properties are set, the issue may persist.

The error message indicates a discrepancy between the JDBC data type in MySQL and the mapping configured in the Hibernate dialect. In this case, it appears that the MySQL version in use is 5 and the specified dialect is MySQL5Dialect.

The solution lies in addressing the specific data type that triggers the error. In the provided case, the UUID column returned by the query was causing the issue. To resolve this, the query was modified to cast the UUID column as a VARCHAR type using the 'cast' function.

By specifying the data type explicitly in the query, the resulting JSON data could be mapped correctly by the Hibernate dialect. The modified query and corresponding Java interface are provided for reference:

@Query(value = "SELECT Cast(stuid as varchar) id, SUM(marks) as marks FROM studs where group by stuid", nativeQuery = true)

public interface Student(){
    private String getId();
    private String getMarks();
}

This approach ensures that the JDBC data type returned by the query matches the mapping supported by the specified Hibernate dialect, resolving the 'No Dialect mapping for JDBC type: 1111' error.

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