Java Runtime.getRuntime().exec not returning any value
Hi,
i written class like this but it is not returning any results and infact p.waitFor() is returning value 1. This is very basic program that i am planning to run in unix. This is really killing my time and unable to find correct reason.
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Code:
import java.io.*;
public class myExecute {
public static void main(String[] args) throws IOException{
Process p=null;
String filename;
String cmd="/bin/touch -t 201412101053 /tmp/first && /bin/touch -t 201412101055 /tmp/last && /bin/find /opt/strms/NETEZZA_LOGS/mdo -type f -name retry.*.csv -newer /tmp/first ! -newer /tmp/last";
int i;
p = Runtime.getRuntime().exec(cmd);
System.out.println("Executed:"+cmd);
try {
if(p.waitFor()==0){
System.out.println("waitfor is over");
i=p.exitValue();
System.out.println(i);
InputStream is = p.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
while((filename=br.readLine())!=null){
System.out.println(filename);
}
}
else{
System.out.println(p.waitFor());
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
System.out.println(e.toString());
e.printStackTrace();
}
}
}
---------------------------------------------------------------
Appreciate for your help
Last edited by Franklin52; 12-12-2014 at 08:47 AM..
Reason: Please use code tags
First, you need to read both stdout and stderr streams from the process before you call waitFor(). If you don't, your child process could block/hang or even fail to run at all as it's output can't go anywhere. How do you read two streams and then call waitFor()? Multiple threads is the way I've seen it done most often.
Second, typing a command in an interactive shell isn't necessarily the same as running it as a subprocess. You may need to escape your "!" character in your Java string.
I kept it simple and was able to run this code without error after I substituted CMD for something simpler like ls so it could very well be that you may need to quote special characters. The first thing that stood out to me in your program is the complexity of what you are shelling.
I kept it simple and was able to run this code without error after I substituted CMD for something simpler like ls so it could very well be that you may need to quote special characters. The first thing that stood out to me in your program is the complexity of what you are shelling.
And that does not address why the original code failed.
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Java Runtime.getRuntime().exec not returning any value