A lightweight analysis tool for detecting mutability in Java classes through unit tests, runtime checks, and FindBugs integration.
Mutability Detector is a lightweight analysis tool that examines Java classes to detect mutability, helping developers ensure objects are immutable. It solves the problem of subtle, hard-to-detect bugs in concurrent programs by automating the verification of immutability rules. The tool can be used in unit tests, as a FindBugs plugin, at runtime, or from the command line.
Java developers building concurrent systems or libraries that require immutable objects for thread safety. It's also useful for teams enforcing code quality standards around immutability.
Developers choose Mutability Detector for its strict, automated analysis that reduces the complexity of writing immutable classes and integrates seamlessly into existing workflows like unit testing and static analysis.
Lightweight analysis tool for detecting mutability in Java classes
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Provides straightforward assertions like `assertImmutable(MyClass.class)` for easy integration into JUnit tests, as demonstrated in the README with minimal setup.
Supports unit testing, FindBugs plugin, runtime analysis, and command-line scanning, offering flexibility across different development stages and workflows.
Applies rigorous immutability rules to minimize false negatives, aiming for high precision as highlighted in the philosophy section, even flagging classes like Integer for primitive array fields.
Includes a blog, JavaDoc, and Gitter chat for support, as shown in the badges and links, aiding in troubleshooting and adoption.
The library is not yet at version 1.0, and the README admits that core Java classes like String fail its strict criteria, which can lead to false positives in real-world use.
Requires manual tweaking to handle false positives, as noted in the unit testing section where users must configure assertions, adding complexity to setup.
Relies on the older FindBugs ecosystem for static analysis, limiting compatibility with newer tools like SpotBugs and potentially hindering integration into modern CI/CD pipelines.