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POTest when server is up or down
 

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    <p>I am trying to test for a server if its reachable or not. I am tailing log files from different servers using ssh and connecting to server using java Ganymed from the following web <a href="http://www.ganymed.ethz.ch/ssh2/" rel="nofollow">http://www.ganymed.ethz.ch/ssh2/</a>. So I am trying to find a simple way of pinging a server because I want to show the user a list of up and down servers so they know their status when they try to tail log files on the servers.</p> <p>Any shed of light would is highly appreciated. I also tried using JPingy but I am not sure if it does what I want as I am getting long messages an exception. Is there something I can use to test if some server is reachable so I can update user with its status ? The following is the code I use from JPingy example which shows me some odd messages which I don't understand. </p> <pre><code>public class Main { public static void main(String[] args) { PingArguments arguments = new PingArguments.Builder().url("google.com") .timeout(5000).bytes(32).build(); PingResult results = Ping.ping(arguments, Backend.UNIX); System.out.println(results.ttl()); System.out.println(results.rtt_min()); System.out.println(results.received()); } </code></pre> <p>}</p> <p>The exception that I am getting is the following</p> <pre><code> java.lang.ArrayIndexOutOfBoundsException: 1 at com.googlecode.jpingy.UnixPingResult.matchReceived(UnixPingResult.java:52) at com.googlecode.jpingy.PingResult.&lt;init&gt;(PingResult.java:79) at com.googlecode.jpingy.UnixPingResult.&lt;init&gt;(UnixPingResult.java:29) at com.googlecode.jpingy.Ping$Backend$1.getResult(Ping.java:31) at com.googlecode.jpingy.Ping.ping(Ping.java:59) at Main.main(Main.java:13) Exception in thread "main" java.lang.NullPointerException at Main.main(Main.java:15) </code></pre> <p>Any kind of help is really appreciated, is it possible to have a true or false returned for connection using some other library ?</p>
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    1. USRaymond Nakampe
    1. USRaymond Nakampe
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    1. COPlease add the messages you are getting from JPingy to your question.
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      1. USlreeder
    2. COHi Ireeder, thanx for the quickly reply, I updated with the exception.
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      1. USRaymond Nakampe
    3. CO[JPingy only supports Linux and Android](https://code.google.com/p/jpingy/downloads/detail?name=jpingy0_1-alpha.jar). I suspect you're using it on Windows - I get the same error as you when I run your code on Windows.
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      1. USLuke Woodward
 

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