Runtime().exec() -- launching an application

Hello again,
I've got a hopefully simple question.
I would like to launch a program, yEd Graph Editor to be exact, from my java application.
I'm working on unix.
I have read most of the much sited guide here http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html however I'm not quite to that point yet, and his discussion most closly related to my inquiry is with respect to Windows.
From that guide I ran a piece of his code:
        try
            Runtime rt = Runtime.getRuntime();
            Process proc = rt.exec("javac");
            int exitVal = proc.waitFor();
            System.out.println("Process exitValue: " + exitVal);
        } catch (Throwable t)
            t.printStackTrace();
          }This ran, no problems.
So I thought why can't I just change the name of the file to be executed?
I tried switching the "javac" to "yed", which is the name of the file were I to run it from the command console.
However, I get the error:
java.io.IOException: java.io.IOException: No such file or directory
   at java.lang.ConcreteProcess.<init>(libgcj.so.7)
   at java.lang.Runtime.execInternal(libgcj.so.7)
   at java.lang.Runtime.exec(libgcj.so.7)
   at java.lang.Runtime.exec(libgcj.so.7)
   at java.lang.Runtime.exec(libgcj.so.7)
   at CreateGML.main(CreateGML.java:10)
Caused by: java.io.IOException: No such file or directory
   at java.lang.ConcreteProcess.nativeSpawn(libgcj.so.7)
   at java.lang.ConcreteProcess.spawn(libgcj.so.7)
   at java.lang.ConcreteProcess$ProcessManager.run(libgcj.so.7)If anyone has any suggestions on how to fix this, or if I'm doing something blatently wrong(likely T_T) please let me know.
Also, once I've got this application open is it possible to load a file into it?
Like opening Adobe Acrobat and then opening a pdf into it?
I've seen, to use the pdf example, people just opening pdfs, which automatically open Acrobat. Unfortunatly, I do not have that option in this case as far as I know.
Thanks again!

Hello,
javac is either in /usr/bin or /usr/sbin and in your searchpath, yed is not:
// ln -s /usr/....bin/yed /usr/bin/yedIf this does not help, try to use the absolute path to its binary.
You can tell the applications you want to execute, to open a file only if these application support command line arguments. e.g. Firefox does support them, and so does Gimp, OpenOffice.org and so on.
just try it in the console (xterm, or similar).
Regards,
Florian
Edit: btw: if you open a pdf file in windows, the entered application gets started automatically. Maybe, but only "maybe" it is possible to chmod +x and then start other files on linux likewise, but I am not that sure if it works.
Edited by: fbrunner on Jul 2, 2008 6:11 PM
Edited by: fbrunner on Jul 2, 2008 6:13 PM

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I wonder why?

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Edited by: apachemaven on 2010-3-5 ??5:38

Problem in Runtime.exec()

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Convoluted at best. You don't need that loop, just useexitCode = process.exitValue();and it will block until notepad exits.
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System version : Red Hat Enterprise Linux 2.4.21-47.ELsmp AS release 3 (Taroon Update 8)
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Richard.

Don't interrupt those threads. Close the output stream first, then wait for the process to exit, then both threads reading the stdout and stderr of the process should get EOFs, so they should exit naturally, and incidentally close the streams themselves.

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