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I want to know how can I run a another java console application (jar1) inside another java application (jar2) also I want to be able to see jar1 outputs and insert my own inputs from jar2.

Let me explain more. there is a program called spigot (see more in www.spigotmc.org): Spigot is CLI java program for running a minecraft server and you have to run it with launch flags in a bat file in windows server like: java -Xmx 1024m -Xms 1024Xms spigot.jar1. Now I want to make a program which let me to running this on my own graphical design not in a console.

How can I pass arguments to an existing command window?

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    stackoverflow.com/questions/15218892/… Commented Mar 29, 2017 at 21:30
  • but i need lunch flags too inside my program. i cant see any lunch flag in this Commented Mar 29, 2017 at 21:34

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Run a new program with ProcessBuilder. You cannot modify arguments in any already running program, so terminate them first.

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Could you give an example? Also, can you pass commands/arguments after you ran the builder? Because you enter your commands in the constructor, and that's the only time the show up :/
ProcessBuilder is used to run a new program, I'm not sure what's ambiguous about it. An example is already in the documentation within it and any I give would be less accurate than the official demo.

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