Process Builder java.io.IOException error=2

Question

I want to run a shell command from my Java application. I have compiled a software called "SRILM" and when I run it from shell everything is OK:

ngram-count -text /home/istanbul/Desktop/snlp_hmm/model.txt -order 3 -lm hoho.lm

However when I run it from my Java application:

ProcessBuilder lmBuilder = new ProcessBuilder("ngram-count", "-text", modelPath, "-order", "3", "-lm", "hohom.lm");
lmBuilder.directory(new File("/home/istanbul/srilm/bin/i686-m64"));

try {
    final Process lmProcess = lmBuilder.start();
    InputStream is = lmProcess.getInputStream();
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br = new BufferedReader(isr);
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
   }
} catch (IOException e) {
    e.printStackTrace();
}

I get that error:

java.io.IOException: Cannot run program "ngram-count" (in directory "/home/istanbul/srilm/bin/i686-m64"): error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041)
    at org.itu.hmm.AlgorithmRunner.evaluate(AlgorithmRunner.java:127)
    at org.itu.hmm.ApplicationRunner.main(ApplicationRunner.java:26)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.io.IOException: error=2, No such file or directory
    at java.lang.UNIXProcess.forkAndExec(Native Method)
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:186)
    at java.lang.ProcessImpl.start(ProcessImpl.java:130)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1022)
    ... 7 more

Any ideas?

So, the full path to your executable is /home/istanbul/srilm/bin/i686-m64/ngram-count/ngram-count? I assume you should use lmBuilder.directory(new File("/home/istanbul/srilm/bin/i686-m64/")); instead. — Tom
– Tom, Commented Apr 5, 2015 at 14:38
@Tom I've changed it, now I get error=2. Actually that program is under path and I can run it (ngram-count) from any directory at shell. — kamaci
– kamaci, Commented Apr 5, 2015 at 15:02
Well, you said the processbuilder, that you provide a working directory, so it expects one, but /home/istanbul/srilm/bin/i686-m64/ngram-count is a file, hence the first exception. Can you update your question with the new exception? Oh, already done, ok :). — Tom
– Tom, Commented Apr 5, 2015 at 15:08
Are you still using the same code? Btw No such file or directory is pretty clear. Check that the provided directory/file really exists. — Tom
– Tom, Commented Apr 5, 2015 at 15:12
Yes, still same code. Also I've tried this one: ProcessBuilder lmBuilder = new ProcessBuilder("/bin/sh" ,"ngram-count -text " + modelPath + "-order 3 -lm /home/furkan/Desktop/snlp_hmm/hohom.lm"); but it does not work... — kamaci
– kamaci, Commented Apr 5, 2015 at 15:14

kamaci · Accepted Answer · 2015-04-05 15:39:51Z

3

When I run it like that it worked:

ProcessBuilder lmBuilder = new ProcessBuilder("/home/istanbul/srilm/bin/i686-m64/ngram-count", "-text", modelPath, "-order", "3", "-lm", "/home/istanbul/Desktop/snlp_hmm/j.lm");

answered Apr 5, 2015 at 15:39

kamaci

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