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graalvmgraalvm-native-imagegluonfx

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