Jersey stopped working with InjectionManagerFactory not found

Understanding Dependencies and Version Alignment

In this wild world of Jersey, dependencies are key. If InjectionManagerFactory is missing from the troupe, you've got a halted application on your hands, as this class manages dependency injection. Keep the following in mind:

• Version Alignment: Keep all your pet Jersey-related dependencies on the same version to prevent runtime tantrums.
• Compatibility Assurance: Using Tomcat or another container? Ensure it's fully supportive of your current Jersey version.
• Dependency Injection (DI): From Jersey 2.26 onwards, HK2 got its own flat and became optional. If you stick with HK2, don't forget to include the "jersey-hk2".
• Runtime Homes: Deploying to Java SE instead of Java EE? Your InjectionManagerFactory might need a different setup (HK2 might want to move back in with you 😅).

Troubleshooting Essentials

Banish Version Discrepancies

To stop runtime tantrums from unmatched versions:

• Give your build script a double-check. Whether you're team Maven or team Gradle make sure those groupId and artifactId entries are bang on.
• Keep Jersey dependencies on a tight leash. When changing versions, update the whole lot at once to keep the peace.

Keeping Dependencies On Track

Here are some top tips for smooth Jersey integration:

• Going with Spring? Use jersey-spring3 or jersey-spring4 for buttery-smooth Spring DI integration.
• When deploying a WAR, check your WEB-INF/lib directory for all necessary JAR files, including jersey-common. Leave no JAR behind!

Outmaneuvering Environmental Roadblocks

• When at EE environments, consider other DI solutions more suited to these corporate spaces, and set up your Jersey accordingly.
• Never forget: your application server or servlet container needs to get along with your Jersey versions. A quick flick through the release notes should keep you in the clear.