change runtime platform does not hold

I am running Netbeans 28 on Linux Mint 22.3 with Open JDK 21. I am 
working on a project that has to run on Java 8. In Project Properties -> 
Run, it shows "Project Platform". When I click Manage Platforms, it 
shows I have Java 8, 11 and 21 installed. I select Java 8 and get out 
but it still show Project Platform. Clicking Manage again, shows Java 21 
still selected. Am I doing something wrong? This is critical that I make 
this work. The program locks on Java 8 but runs on 21. I suspect I have 
used some code that does not work in 8 but have no idea what is was or 
how to find it. If I can set the platform right I'm sure the compiler 
will find it for me.



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