The attachment must have been stripped by something ...
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
/**
* @author Hannes Schmidt.
*/
public class UrlWatchdog {
private static int sleepSeconds = 60;
private final static String watchedURL = "http://put.your.url/here";;
private final static String expectedContent = "your text too look for in
the response";
private final static String restartCommand = "your restart command";
public static void main( String[] args ) {
try {
URL url = new URL( watchedURL );
for(;;) {
boolean success = false;
try {
URLConnection con = url.openConnection();
con.setUseCaches( false );
try {
con.connect();
if( parseResponse( con ) ) {
success = true;
}
} catch( IOException e ) {
e.printStackTrace();
}
} catch( IOException e ) {
e.printStackTrace();
}
if( ! success ) {
restart();
}
try {
Thread.sleep( sleepSeconds * 1000 );
} catch( InterruptedException e ) {
e.printStackTrace();
}
}
} catch( MalformedURLException e ) {
e.printStackTrace();
}
}
private static boolean parseResponse( URLConnection con ) {
InputStream is = null;
InputStreamReader isr = null;
BufferedReader br = null;
boolean success = false;
try {
try {
is = con.getInputStream();
isr = new InputStreamReader( is );
br = new BufferedReader( isr );
String line;
while( null != ( line = br.readLine() ) ) {
if( -1 != line.indexOf( expectedContent ) ) {
success = true;
}
}
} finally {
if( br != null ) br.close();
if( isr != null ) isr.close();
if( is != null ) is.close();
}
} catch( Exception e ) {
e.printStackTrace();
}
return success;
}
private static void restart() {
try {
Runtime.getRuntime().exec( restartCommand );
} catch( IOException e ) {
e.printStackTrace();
}
}
}
----- Original Message -----
From: "Ron Day" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <[EMAIL PROTECTED]>
Sent: Wednesday, February 26, 2003 3:59 AM
Subject: RE: crontab problems
> No Code attached ???????
>
> -----Original Message-----
> From: Hannes Schmidt [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, February 25, 2003 8:02 PM
> To: Tomcat Users List
> Subject: Re: crontab problems
>
>
> I attached a version of my sample code that actually works (JDK used
1.4.1).
>
> Regarding your problem: I don't understand why bouncing Tomcat would
resolve
> a DNS problem. The UnknownHostException is a indication that something is
> wrong with DNS or the resolver library.
>
> ----- Original Message -----
> From: "Ron Day" <[EMAIL PROTECTED]>
> To: "Tomcat Users List" <[EMAIL PROTECTED]>
> Sent: Wednesday, February 26, 2003 1:37 AM
> Subject: RE: crontab problems
>
>
> > I have code very similar to this that does work............... except
> > whenever I get an unknowHostException, it seems to be cached somewhere
> until
> > I bounce Tomcat. My code actually pulses another website (in a thread
> every
> > 3 minutes)that is on the network, rather than check Tomcat. In place of
> your
> > streams, I actually set the request method to "HEAD", and interrogate
the
> > Response Code. This is easy to do in HTTPURLConnection.
> >
> > I instantiate the URL outside the loop (and hence only once), and I am
> > wondering if this is the source of my problem. I plan to test it ASAP.
> >
> > ron
> >
>
>
>
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>
>
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