How do I make my jar file open a terminal window to run other class?

Question

I'm trying to make a Jar file which runs a main class that opens a new terminal window and run other class from inside that Jar.

I saw this discussion " How do I make my java application open a console/terminal window? " and Brandon Barajas' answer was exactly what I was looking for, but only for windows. I know how to make the system detection but I can't make the program do the same for mac and linux. Can somebody (maybe Brandon) help me?

EDIT:

I was able to make it work in linux using this command Runtime.getRuntime().exec(new String[]{"/usr/bin/xterm","-e","java -Dfile.encoding=UTF8 -jar \\"" + "/" + filename + "\\""+"; bash"}); to open xterm and issue the command, but I still don't know how to make it work for mac terminal.

EDIT 2:

Now I can open mac terminal using Runtime.getRuntime().exec("/usr/bin/open -a Terminal /usr/bin/java"); but it still won't accept arguments to run my program. It only opens terminal, run java and exit. If i try using Runtime.getRuntime().exec("/usr/bin/open -a Terminal /usr/bin/java -jar" + filename); it does nothing.

Answer 1

You simple need to change the command that you need to start the java executable on the various platforms. For Linux this has already been answered here How to open a command terminal in Linux? For mac it's going to be similar.

EDIT 1

The linked answer uses the following arguments

String[] cmdArray = {"xterm", "-e", myScript + " ; le_exec"};
r.exec(cmdArray).waitFor();

The -e argument is important. It tells xterm to execute another command. Please read the answer carefully and adjust for your needs, also regarding "; le_exec." If xterm doesn't open, then check if the path and the permissions are correct.

EDIT 2/3 For mac, the question has already been answered here Open a new prompt/terminal window from Java

Runtime.getRuntime().exec("/usr/bin/open", "-a", "Terminal", "/usr/bin/java", "-jar", filename);

where executable is java in your case. Open a new prompt/terminal window from Java

If your filename (including the path) contains spaces, you might be running into a different problem, which has been dealt with here Why does Runtime.exec(String) work for some but not all commands? . I edited the command line for mac to use separate strings for the arguments. Can you try to see if that's working?

EDIT 4:

Alternatively, you could write the command "/usr/bin/java - jar 'your.jar'" to a script file, make it executable and execute it.

import java.io.IOException;
import java.io.PrintWriter;

public class TestClass {
    public static void main(String[] args) throws IOException {
        String jarFileName = "someJar.jar";
        String scriptFileName = "/tmp/script.sh";

        PrintWriter writer = new PrintWriter(scriptFileName, "UTF-8");
        writer.println("#!/usr/bin/env bash");
        writer.println("/usr/bin/java - jar '" + jarFileName + "'");
        writer.close();
        Runtime.getRuntime().exec("chmod u+x " + scriptFileName);
        Runtime.getRuntime().exec(new String[] {"/usr/bin/open", "-a", "Terminal", scriptFileName});
    }
}