Why a session object cannot extends from HashMap?

[pickerel <pi...@gmail.com>]

it's very strange, when the session extends from HashMap, the session will take
no effect,so i have to implements my session object as below:
public class SessionObject /*extends HashMap*/ implements java.io.Serializable
{
    private Map data;

    synchronized Map getMap()
    {
        if (data == null)
            data = new HashMap();
        return data;
    }

    public Object get(Object key)
    {
        return data.get(key);
    }

    public void put(Object key, Object obj)
    {
        data.put(key, obj);
    }

}

there's no problem. I don't know why a session object cannot extends from
HashMap, do i miss something?


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