CallableStatements with Boolean OUT parameter

We observed an inconsistent behaviour from MySQL Connector/J to MariaDB Connector/J.

Steps to reproduce:

1) Create a SP that always returns 0 (false)

create procedure FalseFunc (OUT o_duplicate BIT(1)) begin set o_duplicate = 0; end

2) Create a Test case that calls the stored procedure

@Test

public void test_sp() throws SQLException {

Connection con = DriverManager.getConnection("jdbc:mysql://localhost/mydb", "root", null);

CallableStatement cs = con.prepareCall("{call FalseFunc(?) }");

cs.registerOutParameter(1, Types.BOOLEAN);

cs.executeQuery();

boolean value = cs.getBoolean(1);

assertFalse(value);

con.close();

}

3) Calls the test case with the mariadb-java-client-2.2.5 and mysql-connector-java-5.1.47

4) The test case works with the MySQL JDBC Driver but fails with MariaDB JDBC Driver. It always returns true, even though it should return false.