How do I run a batch file from my Java Application?

Amara_37804 0
Viewed 318515

In my Java application, I want to run a batch file that calls "scons -Q implicit-deps-changed build\file_load_type export\file_load_type"

It seems that I can't even get my batch file to execute. I'm out of ideas.

This is what I have in Java:

Runtime.
   getRuntime().
   exec("build.bat", null, new File("."));

Previously, I had a Python Sconscript file that I wanted to run but since that didn't work I decided I would call the script via a batch file but that method has not been successful as of yet.

runtime.exec batch-file java
12 Answers

Batch files are not an executable. They need an application to run them (i.e. cmd).

On UNIX, the script file has shebang (#!) at the start of a file to specify the program that executes it. Double-clicking in Windows is performed by Windows Explorer. CreateProcess does not know anything about that.

Runtime.
   getRuntime().
   exec("cmd /c start \"\" build.bat");

Note: With the start \"\" command, a separate command window will be opened with a blank title and any output from the batch file will be displayed there. It should also work with just `cmd /c build.bat", in which case the output can be read from the sub-process in Java if desired.

user_338570
user_2870

The executable used to run batch scripts is cmd.exe which uses the /c flag to specify the name of the batch file to run:

Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c", "build.bat"});

Theoretically you should also be able to run Scons in this manner, though I haven't tested this:

Runtime.getRuntime().exec(new String[]{"scons", "-Q", "implicit-deps-changed", "build\file_load_type", "export\file_load_type"});

EDIT: Amara, you say that this isn't working. The error you listed is the error you'd get when running Java from a Cygwin terminal on a Windows box; is this what you're doing? The problem with that is that Windows and Cygwin have different paths, so the Windows version of Java won't find the scons executable on your Cygwin path. I can explain further if this turns out to be your problem.

user_16940

This code will execute two commands.bat that exist in the path C:/folders/folder.

Runtime.getRuntime().exec("cd C:/folders/folder & call commands.bat");
user_75005930 
import java.io.IOException;

public class TestBatch {

    public static void main(String[] args) {
        {
            try {
                String[] command = {"cmd.exe", "/C", "Start", "C:\\temp\\runtest.bat"};
                Process p =  Runtime.getRuntime().exec(command);           
            } catch (IOException ex) {
            }
        }

    }

}
user_146715180
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