JEP 411 (Hidden Classes)

JEP 411, or JDK Enhancement Proposal 411, introduces "Hidden Classes" in Java, allowing developers to define classes that are not accessible through the normal class-loading mechanism. These hidden classes are primarily used in dynamic languages running on the Java Virtual Machine (JVM) for improved performance and security. They enable features like better management of classes that are generated at runtime, making them more efficient. This is particularly useful for frameworks and libraries that require high flexibility, like certain types of scripting or runtime code generation tools, while keeping the internal structures hidden from the main application to reduce clutter.