Determine when a process has ended?

[news.amnet.net.au]

Hi

I am running a process with the runtime command:

Process p = Runtime.getRuntime ().exec (command);

It is very important to me that I know when the process has completed, as
then immediately afterwards I have to do somethign else.
I have tried to get the exitValue() i.e.

int complete = p.exitValue();

But I get an exitvalue of 0 back even before the process completes.
Is there a foolproof way to find out when a process has completed?

My full code of the java program I call from a jsp to start the process is
like this:

package geoinformex.process;
import java.io.*;
import java.net.*;
import java.util.*;

public class RunProcess {

Process p;

public Process RunProcess (String command , boolean wait) {

try
{
p = Runtime.getRuntime ().exec (command);
}
catch ( IOException e )
{
return null;
}
if ( wait )
{
try
{
p.waitFor();
}
catch ( InterruptedException e )
{
Thread.currentThread().interrupt();
}
}
return p;
}
}

Then in my jsp I do this:

String command = "some command here";
boolean wait = false;

RunProcess proc = new RunProcess();
proc.RunProcess(command,wait);

int exitvalue = proc.exitValue();

But, as I said, this exitValue() immediately returns 0, even before the
process completes.

Any help with determining when a process has completed will be very welcome.

Thanks very much

Hugo

 

[David Roden]

String command = "some command here";
boolean wait = false;

If you want to wait for the end of the process, why don't you say so?

 

[Chris Smith]

I am running a process with the runtime command:

Process p = Runtime.getRuntime ().exec (command);

It is very important to me that I know when the process has completed, as
then immediately afterwards I have to do somethign else.
I have tried to get the exitValue() i.e.

int complete = p.exitValue();

But I get an exitvalue of 0 back even before the process completes.
Is there a foolproof way to find out when a process has completed?

You'll have to use the waitFor method. If you need to find this out
without waiting for the process to complete, you may need to create a
new Thread to wait for the process to complete, and then set a boolean
flag somewhere and Object.notify() or some such thing.

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