How to know whether tomcat server is up or not..?

I have developed a java webstart application.In that,I need to include a component in a frame that shows whether the appplication is connected to the server(tomcat) or not.If it is connected to server,then a green light is up,if not red light is up.It should show the connection status althrough the application.I browsed through the apache documentation of Catalina class, http://tomcat.apache.org/tomcat-4.1-oc/catalina/docs/api/org/apache/catalina/startup/Catalina.html ,thinking that it could help me out.But I couldn't find it useful.So,I need a way to know whether the application is connected to server or not.Is there anyway to do it?Thanks in advance..!

hell2heaven wrote:
Yes I need both first and second case,there exists some server listening on a particular port and he can send some request and get some response from it.Well, the second implies the first, so unless you're interested in "The port is active, but the server isn't running properly," testing the second is sufficient--the first won't provide any additional information.
Here my server is apache tomcat and it is running on port 8085.Actually,what happens in the application is when user inputs data via text field,a connection is opened to the appropriate servlet and object is passed to the servlet through that established connection.then servlet returns another object reporting the result,what happened on the server side.I want user to feel sure that he can send data to the servlet running on tomcat successfully.Am I clear enough now..?
Not really.
And if you're saying, "I want to see if the server is running before the user sends a request," that's pointless. Just send the request. If it succeeds, the server is running. If it fails, the server is not running or is unreachable or had some error. If you test first and it comes back good, the server can still go down between your test and the "real" request.

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How to know whether tomcat server is up or not..?

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