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a5sk4s
 Post subject: Defensive Copies in Persistent Classes
PostPosted: Fri Jan 07, 2005 6:07 pm 
Newbie

Joined: Fri Jan 07, 2005 5:46 pm
Posts: 19
I don't seem to be able to do

Code:
public Date getDate() {
    return (Date) date.clone();
}

without causing an exception.

Is this expected behavior?

Is there any documentation that explains why this is not possible?

Is there a technique to allow defensive copies in persistent classes?

Thanks for your help.

Andreas[/code]
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a5sk4s
 Post subject:
PostPosted: Sat Jan 08, 2005 9:37 pm 
Newbie

Joined: Fri Jan 07, 2005 5:46 pm
Posts: 19
I found the issue. I hadn't taken care of possible null values.

The correct way to implement a defensive copy would have been

Code:
    public Date getDate() {
        if ( date == null ) return null;

        return (Date) date.clone();
    }
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