Java-Arduino-使用IDE（禁用了GUI）上传草图时出错，但可从命令行运行

Question

I'm trying to run this command:

"C:\arduino\arduino --upload --board arduino:avr:nano --port COM3 -v ..\config\config.ino"

It works from my command line. It takes just a few seconds to run & finish.

The problem comes when I try to execute it from Java with:

String cmd = "C:\arduino\arduino --upload --board arduino:avr:nano --port COM3 -v ..\config\config.ino"
Process p = Runtime.getRuntime().exec(cmd);

It takes a minute to execute and ends with:

Launch 4j: an error occurred while starting the application

I've tried with ProcessBuilder too. I've also tried saving the command to a batch file and then running the batch file from Java...but I just got the same result.

EDIT:

If I run the batch file from command line it works too. As I said if I run it from Java, it doesn't.

I've realized that if I run the batch file from another batch file it doesn't work neither.

Maybe there is not a problem at all with Java, but with Arduino IDE.

EDIT 2: Adding "start" parameter before the command and saving it to a batch file seems to work. Then you just run the batch from java.

Something like this:

arduino.bat

"start C:\arduino\arduino --upload --board arduino:avr:nano --port COM3 -v ..\config\config.ino"

Java code

String s = "PATH TO ARDUINO.BAT"
Process p = null;
ProcessBuilder pb = new ProcessBuilder(s + "arduino.bat");
pb.directory(new File(s));
p = pb.start();

Answer 1

I think the issue is with the relative path at -v argument. Use full path or set actual working directory with ProcessBuilder .