NullAway
kotlinx-kover | NullAway | |
---|---|---|
4 | 21 | |
1,235 | 3,530 | |
3.6% | 1.2% | |
8.1 | 8.9 | |
6 days ago | 8 days ago | |
Kotlin | Java | |
Apache License 2.0 | MIT License |
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kotlinx-kover
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Apache Maven JaCoCo Configuration
The tool to measure code coverage in Java is JaCoCo, but that is not the only one. There are existing things like OpenClover or in Kotlin things like Kover and so on (just to mention some).
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Kover is a Gradle plugin for Kotlin code coverage tools (by Jetbrains IntelliJ). Does anyone try it? Is it ready for production in Android development?
Kover is still lacking basic Android support and in our Android projects we were not able to replace Jacoco yet (due to errors): https://github.com/Kotlin/kotlinx-kover/issues/18
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Did anyone find a way to exclude compose previews from Jacoco code coverage?
Kover 0.6.1 now supports this: https://github.com/Kotlin/kotlinx-kover/issues/121
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Ask HN: What is a modern Java environment?
- Language: Java 17 or Kotlin
- API Layer: For tiny projects, Vert.x API directly, for larger projects Quarkus
- DB: Postgres, in-memory H2 for simple stuff
- Testing: JUnit 5, Testcontainers to automatically start + stop DB Docker containers with tests, Mockito or Mockk (Kotlin) for mocks
- Dependency Injection: CDI (built into Quarkus, for Vert.x you can initalize Weld when the app starts)
- Build tool: Gradle with Kotlin DSL
- Other tools:
Kover: automatic code-coverage reports from JaCoCo/IntelliJ (https://github.com/Kotlin/kotlinx-kover)
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)
- Nullaway fully supports switch expressions without issues now in 0.9.5
What are some alternatives?
ktlint - An anti-bikeshedding Kotlin linter with built-in formatter
SonarQube - Continuous Inspection
kotlin - The Kotlin Programming Language.
Error Prone - Catch common Java mistakes as compile-time errors
SDKMan - The SDKMAN! Command Line Interface
infer - A static analyzer for Java, C, C++, and Objective-C
example-jacoco - Example Project to setup JaCoCo
Spotbugs - SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.
Quarkus - Quarkus: Supersonic Subatomic Java.
FindBugs - The new home of the FindBugs project
Micronaut - Micronaut Application Framework
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.