What are some common challenges Java 8 developers face when working on legacy systems?

Java 8 developers often encounter challenges when updating or maintaining legacy systems, such as dealing with outdated codebases that may not fully leverage Java 8 features like streams and lambda expressions. Integrating new functionalities while ensuring backward compatibility can be complex, especially if the existing code lacks proper documentation or testing. Collaborating with cross-functional teams to refactor and optimize legacy code, while minimizing disruptions to ongoing business operations, is a key part of the role.