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Modular runtime images

Java's modular system, introduced in Java 9, required changes to the runtime images for compatibility. The benefits of these changes include enhancements in the following areas:

Maintainability
Performance
Security

Core to these changes was a new URI schema used for resource naming. These resources include modules and classes.

A Uniform Resource Identifier ( URI ) is similar to a URL ( Uniform Resource Locator) in that it identifies the name and location of something. For a URL, that something is a web page; for a URI, it is a resource.

There were five primary goals for JEP-220, and these are detailed in the following sections.