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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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But you should just throw an exemption, and let the caller handle it. There is so many variations where an object is null, you can't control, or you are deep inside your own code, it should be covered by a test.
The problem is that when an project is too big and a method is called from multiple contexts it's very easy to lose track of the context where the null check has been done and where it hasn't. This leads to a lot of duplicated null checks around the project and the constant paranoia of "can this be null here?".
A much better way of doing this is using the
Optionalwhen an Object can be "null" and a direct instance where it cannot. This way, at any given context you know for absolute sure if a null check is needed or not. However, even with annotations this does not throw a compile error...