I have two questions about this.
- How do I find the minimum amount of spec's needed to run my game?
- Does writing your code (such as autoboxing) reduce the amount of spec's you need?
1. How do I find the minimum amount of spec's needed to run my game?
You have to find out which OpenGL version is required for the features you are using. Another way is to look for which OpenGL extensions are required for each feature you are using.
2. Does writing your code (such as autoboxing) reduce the amount of spec's you need?
The more code you write, the more features you use. When you use more features you need more specs. Therefore, every single line of code amounts to more amount of spec's.
Even if you don't use autoboxing, you still need Java 1.5. Because jME is only compatible with Java 1.5 and up.