FindBugs
NullAway
| FindBugs | NullAway | |
|---|---|---|
| - | 22 | |
| 764 | 3,712 | |
| 0.3% | 0.7% | |
| 2.0 | 9.1 | |
| about 1 month ago | 1 day ago | |
| Java | Java | |
| - | MIT License |
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FindBugs
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Tracking mentions began in Dec 2020.
NullAway
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JVM/Java: Null-Restricted and Nullable Types
Would be cool if Java got this feature, explicit optionality at a language level a la T? is an enormous developer QoL in Kotlin and Typescript in my experience. In Java there's tools like NullAway [1] but they're a hassle.
Language-level support is leagues better than Optional/Maybe in my experience too because it keeps the code focused on the actual logic instead of putting everything in a map/flatMap railway.
[1] https://github.com/uber/NullAway
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What if null was an Object in Java?
Fortunately, Uber made tooling for languages with broken type systems
* https://github.com/uber/NullAway
* https://github.com/uber-go/nilaway
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My Thoughts on “Bad Code”
Some patterns arise from language design
* You can't express `T` where `null` is forbidden in the type system so you get NullPointerException everywhere and defensive null checks.
* You express a sum type as a product type because your language does not have sum types .
* Your language doesn't have first class multiple return values (or tuples) so you return extra parameters via out parameters or thread local variables such as `errno`.
* Your language doesn't have exceptions (or algebraic effects) and can't do IO so you have monad transformers.
* Your language doesn't have set-theoretic types so you need hacks like `thiserror` .
* Your language doesn't have stackful coroutines or can't infer async IO for you so you have `async/await` spam or callback hell or "mono's".
* Your language doesn't have exhaustive checks (or pattern matching) so you need a fallthrough case check on switch statements .
* Your language doesn't have algebraic effects, so you need to pass context everywhere.
I know someone will reply about Java's null annotation checking options, so here is one of them: https://github.com/uber/NullAway .
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Will Project Valhalla bring Kotlin-like nulls to Java?
If you must use Java, use Uber's Nullaway which gives null safety via Errorprone.
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Retrofitting null-safety onto Java at Meta
Does anyone have experience using this at Meta who can compare to https://github.com/uber/NullAway ?
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How to use Java Records
A special kind of validation is enforcing that record fields are not null. (Un)fortunately, records do not have any special behavior regarding nullability. You can use tools like NullAway or Error Prone to prevent null in your code in general, or you can add checks to your records:
- Backend Java 19 vs Kotlin?
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What does the future hold for Project Amber?
What do you think of https://github.com/uber/NullAway
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Plans for Compile-time Null Pointer Safety?
Take a look at NullAway, a plugin for Error Prone.
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Ask HN: What is a modern Java environment?
PMD, Spotbugs, Nullaway: Java linting/static analysis (https://pmd.github.io, https://spotbugs.github.io, https://github.com/uber/NullAway)
What are some alternatives?
Spotbugs - SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.
Error Prone - Catch common Java mistakes as compile-time errors
SonarQube - Continuous Inspection
Checkstyle - Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.