Execute shell command from java in specific folder

Question

I have a C code which I have compiled and added to path in order to be able to execute it form anywhere (I've double checked that I can do that)

Now I want to do a GUI to work with it in an easier way. I ask the user to input a file and an output directory.

In a click button I put the code to execute the command from the GUI:

String command = "myprogram -e " + file;
new ExecuteShellInstruction().main(command,jTextOutputDirectory.getText());

I execute the code in other class:

p = Runtime.getRuntime().exec(command, null, new File(directory));

But I always get this error:

java.io.IOException: Cannot run program "myprogram" (in directory "/Users/user_name/Documents/folder/example"): error=2, No such file or directory

I've checked that if I write exactly the same from the same folder there is no problem.

Any idea of what I'm doing worng?, If obtained this way of doing it from a question which was marked as correct, maybe I'm missing something, but I've already been 1 hour trying things and nothing seems to work.

Thank you!

its clearly stating its not able to locate the file in the present working directory — Shreyas Sarvothama
– Shreyas Sarvothama, Commented Oct 27, 2016 at 0:41
@ShreyasSarvothama yes, it says so. But as I've mentioned when I do it directly in that directory from the shell it works perfectly.. — nck
– nck, Commented Oct 27, 2016 at 0:52
but where are you working your java code from.. set the directory first and then run it.. shell default directory is different and java working directory is different — Shreyas Sarvothama
– Shreyas Sarvothama, Commented Oct 27, 2016 at 0:58
@ShreyasSarvothama Sorry, I don't understand what you mean. As I understand with getRuntime().exec method, I specify as parameters the shell instruction, null, and in which folder do I want it to be executed: docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html — nck
– nck, Commented Oct 27, 2016 at 1:28

nck · Accepted Answer · 2016-10-27 01:56:14Z

1

Finally I found a solution. It seems like you have to tell that your application can be executed by adding "./" at the beginning. Something like this:

String command = "./myprogram -e " + file;

answered Oct 27, 2016 at 1:56

nck

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5 Comments

that other guy Over a year ago

Use the overload that accepts a String[], otherwise you will be unable to process filenames with spaces.

nck Over a year ago

Thank you, could you specify where exactly? String [] command?

trashgod Over a year ago

@nck: See Runtime; also consider ProcessBuilder, shown here.

nck Over a year ago

@trashgod I've tried to do it in the way its in your link but it seems like I'm now in more trouble ':/ problem

trashgod Over a year ago

@nck: Sadly, without a complete example, there are too many ways for this to go awry.

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