Java's popularity on Repl.it is reinforced by the platform's integration of packaging support via the Universal Package Manager, which now allows users to add, remove, and search for Java packages using Maven. This advancement streamlines the process of coding collaboratively and building new applications from existing ones, as demonstrated by a project that utilized the crawler4j library to collect Twitter threads and then parsed and served them using Jonathan Hedley's jsoup and Blade framework. The ease of adding, testing, and swapping packages makes Java on Repl.it feel as agile as a scripting language, and the platform invites user feedback to further enhance JVM packaging support.