Error in stored procedure or SQL statement with allowMultiQueries does not raise Exception when there is a result returned prior to erroneous statement

Scenario 1:
Stored procedure:

DELIMITER $$
CREATE PROCEDURE `TEST_SP1`()
BEGIN

SELECT @Something := 'Something'; – this statement triggers the issue

SIGNAL SQLSTATE '70100'
SET MESSAGE_TEXT = 'Test error from SP';
END

Java code:
Connection conn = null;
try{
conn =
DriverManager.getConnection("jdbc:mysql://<server>/<Database>?" +
"user=<user>&password=<pwd>");
CallableStatement cStmt = conn.prepareCall("

{call TEST_SP1()}

");
boolean success = cStmt.execute();
System.out.println("Successful");
} catch (Exception ex)

{ System.out.println("Exception caught: " + ex.toString()); throw ex; }

finally

{ conn.close(); }

Expected:
Exception is raised

Actual:
Call returns successfully, execute() method returns true


Scenario 2:
Connection conn = null;
try{ conn = DriverManager.getConnection("jdbc:mysql://<server>/<Database>?" + "user=<user>&password=<pwd>&allowMultiQueries=true"); PreparedStatement stmt = conn.prepareStatement("SELECT 1; INSERT INTO TEST_TBL ;"); stmt.execute(); System.out.println("Successful"); } catch (Exception ex) { System.out.println("Exception caught: " + ex.toString()); throw ex; } finally { conn.close(); }

Expected:
Syntax error in Insert statement.

Actual:
Successful. if I remove the "SELECT 1; " prior to Insert statement, it does throw java.sql.SQLSyntaxErrorException