Invoke external program using ProcessBuilder

[seongjoo]

Hello,

I am trying to invoke an external program using ProcessBuilder. It seems pretty straight forward so I implemented some code to perform the task. But somehow the program is terminated without performing the specified task. The ProcessBuilder supposedly throws an exception if something is wrong but it didn't throw any exception and is just finished.

List<String> command=new ArrayList<String>();
	
command.add(ExecPath);		

try {
	ProcessBuilder pb = new ProcessBuilder(command);
	Map<String, String> env = pb.environment();
		
	pb.directory(new File(workdir));			
			
} catch (IOException e) {
[INDENT]e.printStackTrace();
return false;[/INDENT]
}

[masijade]

Because you haven't actually started the process.

[seongjoo]

I accidentally delete those part when posting the thread. But it's there.

try {
			ProcessBuilder pb = new ProcessBuilder(command);
			Map<String, String> env = pb.environment();			
			
			pb.directory(new File(workdir));
			final Process process =pb.start();

} ...

[masijade]

You haven't told the program to wait for the process to finish. See the API docs for Process.

[seongjoo]

You haven't told the program to wait for the process to finish. See the API docs for Process.

Ah, that makes very much sense. I will try that and get back with the result. Thank you :)

[seongjoo]

You haven't told the program to wait for the process to finish. See the API docs for Process.

Well, process.waitFor() returns 1 so there is some problem executing the external program... Hmm...

[masijade]

So read the output and error streams and find out what happened.