Prepare Statement doesn't remove { } characters

This is issue shows up when MariaDB connector is used with EclipseLink.
EclipseLink is a JPA 2.0 implementation and allows calling a stored procedure. It works fine with MySQL connector, where it creates correctly sp call based on provided class. However, when MariaDB connector is used all calls to SP fails, this happens due to the fact that EclipseLink (platform->MySQLPlatform) sends a prepare request with a text like

{ CALL sp() }. prepareCall method correctly removes {} brackets from a provided text and produces a correct query, however, and prepareStatement method doesn't call escape on a text provided and as the result call DB with a text { CALL sp() }

.
The request fails with an error:
Internal Exception: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '

{ CALL sp_list() }' at line 1
Query is : { CALL sp_list() }

Error Code: 1064
Call:

{ CALL sp_list() }