I need to Ping an application before going to load

Hi All,
I need to ping an application to check whether it is working or not.
Basically my requirement is I am loading a Home page of application A which includes application B as a part of the page. Before going to load the application B in the Home page i need to ping the application to check whether it is working or not. If it is not working i need to disable that.
Is there any thing to ping the particular port or something else?
Please advise me on this.
Thanks in advance
Varma.

Well...
If aplication B is a Server, you can make a connection using java.net.Socket to verify if it is running before using it from aplication A.

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