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

Question

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.

Answer 1

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.

Answer 2

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

Answer 3

ProcessBuilder is the Java 5/6 way to run external processes.