[SOLVED] Get directory of compiled native image by GraalVM at runtime

Get directory of compiled native image by GraalVM at runtime

I compiled my Java application with (GluonFX which itself uses) GraalVM. How can I get the directory where my application binary resides at runtime? (not the users working directory)

Before using GraalVMs native-image tool, I used to read System.getProperty("java.home") and deduced it from there. But this system property does not exist anymore.
I tried to find another system property, but the directory of my application was in none.
I tried to read environment variables and found System.getenv("_"), but as "_ contains the last program run", this does not feel stable.
I tried to resolve Paths.get(".").toAbsolutePath() but this only returned the current working directory.

My end goal is to package this small application binary in a bigger application and this small application should call other applications which will get packaged next to it.

Solution

You can get the running path from java code like below

Path path = Path.of(
        Main.class.getProtectionDomain()
                .getCodeSource()
                .getLocation()
                .toURI()
).getParent();
System.out.println(path);

Please change the Main class to the class you use in your code.

There is another way too but that requires nativeimage dependency.

<dependency>
    <groupId>org.graalvm.nativeimage</groupId>
    <artifactId>library-support</artifactId>
    <version>23.0.1</version>
    <scope>provided</scope>
</dependency>

then call it like below

System.out.println("exe path:"+ProcessProperties.getExecutableName());

example output

oz-mint@ozmint-MACH-WX9:~/Downloads/my-gluon-application$ ./target/gluonfx/x86_64-linux/My\ Gluon\ Application 
exe path:/home/oz-mint/Downloads/my-gluon-application/target/gluonfx/x86_64-linux/My Gluon Application
Dec 30, 2023 3:22:52 PM com.sun.javafx.application.PlatformImpl startup
WARNING: Unsupported JavaFX configuration: classes were loaded from 'unnamed module @71c7db30'
Dec 30, 2023 3:22:53 PM com.gluonhq.attach.util.Platform <clinit>
INFO: [Gluon Attach] System Property javafx.platform is not defined. Platform will be set to Platform.DESKTOP

working example

References