Exposing a Java Application

Hello Snapcraft community:
im trying to create a snap which runs a java application.
The snap creation works, but unfortunately i cant launch the application.
Im very new into snaps, so help would be much appreciated

Here is my Snapcraft.yaml file:

name: java-app #
base: core18
version: ‘2021.1’
summary: java test app
description:
this is a java app
grade: devel
confinement: devmode

parts:
java-app:
plugin: nil
source: ./
override-build:
mv $SNAPCRAFT_PART_INSTALL/usr/lib/jvm/java-11-openjdk-* $SNAPCRAFT_PART_INSTALL/usr/lib/jvm/java-11-openjdk
stage-packages:
- openjdk-11-jre
- ca-certificates
- ca-certificates-java

apps:
java-app:
command: /project/src/bin/run.sh
environment:
JAVA_HOME: $SNAP/usr/bin/jvm/java-11-openjdk
PATH: $JAVA_HOME/jre/bin:$PATH

Output when generating snap:

Staging java-app
snapcraftctl stage
Priming java-app
snapcraftctl prime

A shell wrapper will be generated for command ‘/src/bin/run.sh’ as it does not conform with the command pattern expected by the runtime
Commands must be relative to the prime directory and can only consist of alphanumeric characters, spaces, and the following special characters: / . _ # : $ -
Snapping |
Snapped java-app_2021.1_amd64.snap

Output after installing snap and then launching java app:

java-app
/snap/java-appe/x1/command-java-app.wrapper: 2: exec: /project/src/bin/run.sh: not found

Im not sure how to expose the java-app appropriately.

More Information:
Im on a Mac and running a VM with Multipass.
For testing of the snap i mount the directory to a fresh VM
The Java application itself is on my mac desktop and unzipped.