Java ProcessBuilder calling another java with arguments

Question

I want to use ProgressBuilder to run another jar with arguments inserted.

Example: es.jar file with Main class, and an arg sl. I know I can use Runtime.getRuntime().exec() like this:

String arg = "sl";
Process p = Runtime.getRuntime().exec("java -cp \"es.jar " + arg + "\" Main");

If I use ProgressBuilder, without the arg sl, it would be like this:

processBuilder.command("java","-cp","es.jar", "Main").start();

However, arg sl is needed, how can I insert it? I have tried the following codes but obviously none of them work:

processBuilder.command("java","-cp","es.jar sl", "Main").start(); // failed
processBuilder.command("java","-cp","\"es.jar sl\"", "Main").start(); // failed also

@MadProgrammer It would not work as intended, since it would try to find sl class to run main function, which do not exist. — Nin
– Nin, Commented Sep 14, 2017 at 2:37
Have you tried flipping them? processBuilder.command("java","-cp","es.jar", "Main", arg).start(); - But I'm left thinking, can you send parameters to a class this way... — MadProgrammer
– MadProgrammer, Commented Sep 14, 2017 at 2:39
@MadProgrammer Flipping them does work! Thanks, that is the answer. — Nin
– Nin, Commented Sep 14, 2017 at 2:42

MadProgrammer · Accepted Answer · 2017-09-14 02:45:14Z

2

java -cp "es.jar sl" Main makes no sense, and I'm pretty sure it would otherwise fail

java states java [-options] class [args...], so the first parameter after the options is the class to be executed, so based on your question, that would mean it needs to be

java -cp es.jar Main sl, or in more specifically, in regards to your question, processBuilder.command("java","-cp","es.jar", "Main", arg).start();

answered Sep 14, 2017 at 2:45

MadProgrammer

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Grimthorr · Accepted Answer · 2017-11-30 14:10:16Z

0

Please use the following command instead:

java -cp es.jar Main

edited Nov 30, 2017 at 14:10

Grimthorr

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answered Sep 14, 2017 at 2:47

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