ADDITIONAL SYSTEM INFORMATION :
macOS: 11.2.3
java: adoptopenjdk16+36, open jdk-17-ea

A DESCRIPTION OF THE PROBLEM :
Launching an application with a '.' character in the app name results in an error message. E.g using the name "hello.world" results in the following line when running the app ./hello.world.app/Contents/MacOS/hello.world:

    Error opening ".../hello.world.app/Contents/app/hello.cfg" file: No such file or directory

Snooping around in the source code, the "createJvmLauncher" method in AppLauncher.cpp suggests that the cfg path is composed by _replacing_ any suffix in the launcher path with ".cfg", when just appending it seems more appropriate.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use a name with a '.' in the --name parameter when calling jpackage:

    jpackage --type app-image --name hello.world ...

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Launching the resulting application should not result in error messages.
ACTUAL -
Launching the resulting application results in an error message:

    Error opening ".../hello.world.app/Contents/app/hello.cfg" file: No such file or directory

CUSTOMER SUBMITTED WORKAROUND :
Refrain from using '.' characters in app names.

FREQUENCY : always