TL;DR Gradle and Android users are likely to be most impacted, since a lot of their tooling has directed users towards JCentral in the past.<p>While JCentral is a strict superset of Maven Central, it means that there are some libraries/tools that are present in JCentral which will disappear. Given the short notice period (end of April 2021) it's likely this will take people by surprise when it happens, and at that point, there will be no way of recovering the libraries that you depended on to build your Gradle and Android projects.