LinuxQuestions.org - Problems with installation of jstock

I am using LMDE 4 and I tried to install jstock as followed

Code:

cd ~

wget https://github.com/yccheok/jstock/releases/download/release_1-0-7-44/jstock-1.0.7.44-bin.zip

unzip jstock-1.0.7.44-bin.zip

cd jstock/

chmod 755 jstock.sh

./jstock.sh

that worked
then I checked if java is already installed

Code:

madmax@travelmate:~$ java -version

openjdk version "11.0.6" 2020-01-14

OpenJDK Runtime Environment (build 11.0.6+10-post-Debian-1deb10u1)

OpenJDK Server VM (build 11.0.6+10-post-Debian-1deb10u1, mixed mode, sharing)

madmax@travelmate:~$

seems that it s installed
But i only get jstock running via terminal

Code:

madmax@travelmate:~$ cd jstock/

madmax@travelmate:~/jstock$ 

madmax@travelmate:~/jstock$ ./jstock.sh

Warning: /bin/java does not exist

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by com.thoughtworks.xstream.core.util.Fields (file:/home/madmax/jstock/lib/xstream-1.4.11.1.jar) to field java.util.TreeMap.comparator

WARNING: Please consider reporting this to the maintainers of com.thoughtworks.xstream.core.util.Fields

WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations

WARNING: All illegal access operations will be denied in a future release

Security framework of XStream not initialized, XStream is probably vulnerable.

Security framework of XStream not initialized, XStream is probably vulnerable.

Security framework of XStream not initialized, XStream is probably vulnerable.

Security framework of XStream not initialized, XStream is probably vulnerable.

Security framework of XStream not initialized, XStream is probably vulnerable.

and I miss the entry in the menu. When I close the terminal, jstock will disappear.Any help will be appreciated