Bug #25328 Resultset.getObject on a BIT(64) type returns java.lang.String
Submitted: 29 Dec 2006 11:15 Modified: 13 Apr 2007 8:37
Reporter: Neha Khaitan Email Updates:
Status: Closed Impact on me:
Category:Connector / J Severity:S3 (Non-critical)
Version:3.1.15SVN OS:Microsoft Windows (Windows XP Professional SP2)
Assigned to: CPU Architecture:Any

[29 Dec 2006 11:15] Neha Khaitan
I am using MySql 5.0.27.
Driver : mysql connector/j 3.1.12

ResultSet.getObject() returns a java.lang.String instead of a bytearray.

How to repeat:
I have a table with the following DDL:

create table Binary_Tab (BINARY_VAL BIT(64) NULL);

I do the following from a JSP.

Connection conn = getConnection();//code omitted for getConnection()

    String insertString = "insert into Binary_Tab values(null)";
    Statement statement = conn.createStatement();

    byte[] bytearr = new byte[8];
    String sbyteval = null;
    // to get the bytearray value
    for (int count = 0; count < 8; count++) {
        sbyteval = Integer.toString(count % 255);
        bytearr[count] = Byte.parseByte(sbyteval);

    String binTabUpdate = "update Binary_Tab set BINARY_VAL=?";
    PreparedStatement pstmt = conn.prepareStatement(binTabUpdate);
    String binTabQuery = "Select BINARY_VAL from Binary_Tab";
     ResultSet resultSet = statement.executeQuery(binTabQuery);
     Object object = resultSet.getObject(1);
    System.out.println("resultSet.getObject(1).getClass() = " + object.getClass().getName());
    byte[] oRetVal = (byte[]) object;

It throws a ClassCastException when tryin to cast object to byte array as it is a java.lang.String object.
[29 Dec 2006 13:34] Valeriy Kravchuk
Thank you for a problem report. Please, try to repeat with a newer version, 3.1.14, and inform about the results.
[2 Jan 2007 8:55] Neha Khaitan

I tried the same with mysql connector/j 3.1.14. It still throws ClassCastException.
[26 Mar 2007 13:17] Tonci Grgin
Hi Neha and thanks for your report.
According to http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-type-conversions.html we have a bug.

Verified as described with attached test case on
 - MySQL server 5.0.38BK on WinXP Pro SP2 localhost
 - c/J 3.1.15SVN and JDK 1.5.0_10
[26 Mar 2007 13:18] Tonci Grgin
Test case

Attachment: TestBug25328.java (text/x-java), 1.94 KiB.

[26 Mar 2007 15:06] Bugs System
A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

[26 Mar 2007 15:13] Mark Matthews
This is fixed in the 5.0 branch. It is not the class of bug that would make it into the "legacy" release of 3.1.
[13 Apr 2007 8:37] MC Brown
A note has been added to the 5.0.6 changelog.