Bug #91157 NullPointerException when calling zero-argument function with alternate definer.

• Submitted: 6 Jun 2018 11:44
• Modified: 6 Jun 2018 16:53
• Reporter: Simon Greatrix
• Status: Can't repeat
• Category: Connector / J
• Severity: S3 (Non-critical)
• Version: 5.1.46
• OS: Any
• CPU Architecture: Any

[6 Jun 2018 11:44] Simon Greatrix

Description:
See "How to repeat". The following exception is raised:

java.lang.NullPointerException
	at com.mysql.jdbc.CallableStatement$CallableStatementParamInfo.iterator(CallableStatement.java:364)
	at com.mysql.jdbc.CallableStatement.setInOutParamsOnServer(CallableStatement.java:2008)
	at com.mysql.jdbc.CallableStatement.execute(CallableStatement.java:834)
	at MySqlFunctionTest.main(MySqlFunctionTest.java:30)

How to repeat:
SQL to create test case:

-------------------------------------------------------------------------------
CREATE DATABASE IF NOT EXISTS `test`;
CREATE USER IF NOT EXISTS `tester`@`localhost` IDENTIFIED BY 'tester';
CREATE USER IF NOT EXISTS `test_owner`@`localhost` IDENTIFIED BY 'tester';
GRANT ALL ON test.* TO `tester`@`localhost`;

USE `test`;

DROP FUNCTION IF EXISTS `hiFive`;

DELIMITER $$
CREATE DEFINER=`test_owner`@`localhost` FUNCTION `hiFive`() RETURNS INTEGER
BEGIN
   RETURN 5;
END;
$$
DELIMITER ;

GRANT EXECUTE ON FUNCTION hiFive TO `tester`@`localhost`;
GRANT EXECUTE ON FUNCTION hiFive TO `test_owner`@`localhost`;
-------------------------------------------------------------------------------

Then access with Java program:

import java.sql.*;
public class MySqlFunctionTest {
  public static void main(String[] args) throws Exception {
    Connection conn = DriverManager.getConnection("jdbc:mysql://address=(host=localhost)(protocol=tcp)(useSSL=false)(noAccessToProcedureBodies=true)"
        + "(port=3306)/test", "tester", "tester");
    CallableStatement callableStatement = conn.prepareCall("{? = CALL hiFive()}");
    callableStatement.registerOutParameter(1, Types.INTEGER);
    callableStatement.execute();
    System.out.println("Function returned: " + callableStatement.getInt(1));
  }
}

Suggested fix:
Adding a dummy parameter to the function avoids the NullPointerException. This is a work-around, not a fix.

[6 Jun 2018 13:53] Chiranjeevi Battula

Hello Simon Greatrix,

Thank you for the bug report and testcase.
I could not repeat the issue at our end using with Connector / J  5.1.46, MySQL 5.7.22 version.
Please use "useInformationSchema=true" in connection string.

Thanks,
Chiranjeevi.

[6 Jun 2018 13:54] Chiranjeevi Battula

Screenshot

Attachment: Bug_91157.PNG (image/png, text), 67.63 KiB.

[6 Jun 2018 16:53] Simon Greatrix

I can confirm that if I add "(useInformationSchem=true)" to the connection string, then I do not have NullPointerException. However the issue does replicate on multiple machines for me using Connector / J version 5.1.46 and MySQL version 5.7.22