How to create PERTHREAD_SCOPE object?

[Donyee]

I want to create a new  object per request, and my code is like:

@Scope(IOCConstants.PERTHREAD_SCOPE)
    public Encoder buildEncoder() {
        System.out.println("new Encoder()...*****************************");
       return new Encoder();
       }

when i request my page with IE and FireFox,
the output is "new Encoder()...*****************************", only print
once!
is there anything wrong with my code?