Runtime.getRuntime() restart mac Java IM

Question

My os is MAC OS 10.11.3.

I using Spark as our IM（Instant messaging），but when the IM log out，IM give an error，said：

java.io.IOException: Cannot run program "open": error=2, No such file or directory .

But when Eclipse runs it， it worked well，and when I wrapped it a mac package and installed it and run it, click "log out" button, it throws errors.

In program, when I log out，I launch a new IM，meanwhile，I killed the old IM application.

Furthermore，in terminal，no matter what I run how many times “open -a Spark”，it just open the same IM，

The source as follows：

public boolean restartApplicationWithScript() {
    String command = null;
    try {
        if (Spark.isMac()) {
            command = "open -a " + Default.getString(Default.SHORT_NAME);
        }

        String commands[] = {"open", "/Applications/Spark.app"}; 
        Runtime.getRuntime().exec(commands);

        System.exit(0);
        return true;
    } catch (IOException e) {
        Log.error("Error trying to restart application with script", e);
        return false;
    }
}

Answer 1

The exception seems to be saying that it cannot find the open command. That seems a bit odd, since it is a standard MacOS command. So I suspect that the reason that it cannot be found is that it is not on the PATH.

• Try giving the absolute pathname for the open command. Running which open should tell you what it is.
• If open is a shell builtin on MacOS, then you will need to create a subshell to run the command.

Answer 2

Thanks for all， i solved it by 2 step ： 1， cmdline = { "open", "-na", "Microsoft Excel" }; this add a "n" ,otherwise，it will open the same app 。 2，chmod -R 777 youAppPath，if not do this ，the app can't issue the command