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Make Your Java Code Null-Safe Without Rewriting
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this post was submitted on 06 Nov 2025
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Programming
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Nulls are useful, but you can't work with them in Java. Anything can be null at any time without warning, even when you have absolutely no reason to ever allow a null. Null safety as a language feature gives you the choice to allow nulls when they make sense or guarantee a value when needed. It saves you checking for nulls in the core of your logic when you already ruled them out at the boundary and enforced it at compile time.
If you check for them in your boundary, you shouldn't check for them everywhere, only where you possibly introduce them ...
But you can't look at a method signature and instantly know who handles the null check. You need to inspect code and calls to know for sure. This will lead to paranoia, sooner or later