It's not that hard to perform Java file uploads. The new Servlet and JSP API, along with HTML5 input form enhancements, make Java file uploads, both synchronously and asynchronously with Ajax, ...

Contents of a JAR file Java applications and libraries can contain hundreds of different files, including compiled Java source code, a manifest file, XML-based configuration data, JSON-based data ...

Java 23, now generally available, includes previews of module import declarations, stream gatherers, structured concurrency, scoped values, and a class-file API. And much more.