JDK 11 Update & JMockit Issue Fix

I am currently running a Java REST project built on Maven. I recently updated the project to JDK 11 to enhance performance. However, I'm now facing build failures with JMockit for JUnit 4. I require a skilled Java developer to assist in successfully building the project and resolving any issues that may arise during this process.

Key requirements:
- Expertise in Java development
- Solid understanding of JUnit 4 and JMockit
- Proficiency in Maven build tool
- Experience in upgrading Java projects to JDK 11
- Troubleshooting skills to identify and resolve build issues
- Clear communication to explain any necessary changes or updates to me.

Your assistance will be greatly appreciated, and I look forward to working with a professional who can help resolve these challenges efficiently.