Question 1

Guice or Spring: which dependency injection framework should I use?

Accepted Answer

Guice is better for lightweight, type-safe DI with minimal overhead, while Spring offers a more comprehensive ecosystem with built-in features like web MVC and auto-configuration. Choose Guice if you prefer a focused tool for dependency management, but Spring if you need an all-in-one framework.

Question 2

How to configure Guice modules for a web application?

Accepted Answer

Use Guice's Servlet extension to bind servlets and filters, and set up modules that define your dependencies. You'll need to integrate with a web server like Jetty or Tomcat, and the user guide provides examples for common web scenarios.

Question 3

What are Guice assisted injection and when to use it?

Accepted Answer

Assisted injection is an extension that helps inject dependencies where some parameters are provided at runtime, such as in factory methods. It's useful for cases where object creation requires both injected and caller-supplied values, reducing boilerplate code.

Question 4

How does Guice handle error reporting in complex dependency graphs?

Accepted Answer

Guice generates clear, actionable error messages that trace dependency issues, making it easier to debug missing bindings or circular dependencies. This is part of its design philosophy to avoid surprises and speed up development.

Question 5

Guice vs Dagger: what are the key differences?

Accepted Answer

Guice is a runtime DI framework with reflection-based injection, while Dagger uses compile-time code generation for better performance. Guice is more flexible with dynamic features, but Dagger is often preferred for Android or performance-critical applications due to its efficiency.

Question 6

Migrating from javax.inject to jakarta.inject with Guice: steps and pitfalls?

Accepted Answer

Switch from Guice 6.0.0 (javax) to 7.0.0 (jakarta) by updating dependencies and ensuring your code uses the correct annotations. Watch for compatibility issues with libraries that haven't migrated, and refer to the Guice wiki for transition guidance.

Guice

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