Getting path of java bundler on Mac

Question

I have made an Mac application MyApp.app with Jar Bundler. Because I have an external jar, lib/AutoUpdate.jar that is in the same folder path as the MyApp.app, I need the current path of the MyApp.app to be able to run auto-updates. Apparently:

System.getProperty("user.dir");

Dose not work. I also tried:

String path = System.getProperty("user.dir");
if(path.contains("/MyApp.app")){
   int i = path.indexOf("/MyApp.app");
   path = path.substring(0,i);
}

But this also seems to be incorrect path of the MyApp.app. Any ideas how to get the correct path or if I at least can debug the the MyApp.app to get a view of System.out.println() commands?

Answer 1

Try Applications/MyApp.app for the location if it is in the given area, or you could use a Unix command to launch the jar at the desired directory (and not hardcode it into the .jar file).

-x is used for executables, but apps usually also work with -d and all work with -e commands.

To implement, place your AutoUpdater.jar with the other .jar files in MyApp.app/contents/resources/java. The AutoUpdater.jar should look something like this:

main()
{
    if [ -x Applications/MyApp.app];then
        cd Applications/MyApp.app/contents/resources/java
        java AutoUpdater.jar
        wait 86400
        main
    else
        wait 3600
    fi
}
main

The next bit of code will attempt to see if the app exists every hour and update daily if left running.

download()
{
    cd Applications/MyApp.app/contents/resources/java
    if ! curl -LO http://your.url.that.it.is.updating.from;then
        echo "Failed to download"
        wait 3600
    else
        wait 86400
    fi
}

You can completely remove AutoUpdate.jar by adding this to the code before the last line. Replace this:

java AutoUpdater.jar
wait 86400

... with this:

download

This is designed only for JarBundler apps. You should use this to replace the current .jar file.

if ! curl -LO http://cbukk.it/craftbukkit-dev.jar;

As a side note, the command user.dir usually gets /Users/yourName as the path. You could change this to use a global identifier in JarBundler like so:

String path = com.mycommpany.myapp;