[debian install java failure]

i am try to get tekkit to work and after like 4 days fore pain i didt get it work how can i get it to work like i am using the newest version of java what was a issue ...

\ uhg idk anymore its hitting me hard

 

java version "16.0.1" 2021-04-20
Java(TM) SE Runtime Environment (build 16.0.1+9-24)

what i tryed to fix but idk any more if any one knows a fix ore so please help me.

 

[i am having a issue with minecarft tekkit]

it doesnt work cause of java i am having the newst version installed but how do i install the a older one

~$ java -version

openjdk version "11.0.9.1" 2020-11-04
OpenJDK Runtime Environment (build 11.0.9.1+1-post-Debian-1deb10u2)
OpenJDK 64-Bit Server VM (build 11.0.9.1+1-post-Debian-1deb10u2, mixed mode)

how can i install a older one ore a other one ???