ADDITIONAL SYSTEM INFORMATION :
Ubuntu 19.04 (via VirtualBox)
jdk 16.0.1
GraalVM 11 (21.1.0)

A DESCRIPTION OF THE PROBLEM :
GraalVM places it's jli lib where the jpackage app launcher does not find it and the application launch fails.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a jpackage application using the GraalVM using --runtime-image
--runtime-image '/home/mjh/Downloads/graalvm-ce-java11-21.1.0

Try to launch the application and it fails.

Looking at the application log shows...
Failed to find JVM in "/opt/halfpipe-graal11/lib/runtime" directory.

The jpackage source for AppLauncher.cpp includes...

    if (jvmLibNameEntry == jvmLibNames.end()) {
        JP_THROW(tstrings::any() << "Failed to find JVM in \""
            << runtimePath
            << "\" directory.");
    }

Comparing a successful jdk application and the Graal one shows the location for libjli.so is different like...
jdk
/opt/halfpipe/lib/runtime/lib/libjli.so
graal
/opt/halfpipe-graal11/lib/runtime/lib/jli/libjli.so

For Graal it is in a nested directory.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The application launches
ACTUAL -
The application fails to launch

---------- BEGIN SOURCE ----------
Simply download the GraalVM JDK and verify the different layout. Build an application and verify it doesn't launch if you want.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Creating a symlink for libjli.so in the usual place for the downloaded JDK works. A .deb created with that installs a launch-able application. From the lib directory I did...

ln -s jli/libjli.so

FREQUENCY : always