using ODMG as a singleton

[Will Jaynes]

Is it proper to use ODMG as a singleton in my web application? I have 
the following class (brief version) that gets the ODMG Implementation 
object once, and opens the database once. From then on I simply call 
OjbDAOFactory.getODMG().

Is this a safe and proper way to do things? If not, what would be a 
better usage?  Thanks.

public class OjbDAOFactory
{
    static Implementation odmg;
    static Database db;
    static {
        try {
            odmg = OJB.getInstance();
            db = odmg.newDatabase();
            db.open("default", Database.OPEN_READ_WRITE);
        } catch (ODMGException ex) {
            LOGGER.error("", ex);
        }
    }
    public static Implementation getODMG()
    {
        return odmg;
    }
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