How do I find which application is using up my port?

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I am unable to start GlassFish, because it keeps showing this error message:

SEVERE: Shutting down v3 due to startup exception : No free port within range: 8080=com.sun.enterprise.v3.services.impl.monitor.MonitorableSelectorHandler@ed7d1

How can I find what applications are using what ports on Windows Vista? I have tried using nmap zenmap using the following target:

http://127.0.0.1:8080

But all I get is this:

Starting Nmap 5.51 ( http://nmap.org ) at 2011-08-05 12:05 Central Daylight Time

NSE: Loaded 57 scripts for scanning.

Read data files from: C:\Program Files\Nmap
Nmap done: 0 IP addresses (0 hosts up) scanned in 4.55 seconds
           Raw packets sent: 0 (0B) | Rcvd: 0 (0B)
WARNING: No targets were specified, so 0 hosts scanned.
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