You can download the old Java build system, Apache Ant, from 2003 and it still runs without issue: https://archive.apache.org/dist/ant/binaries/ https://archiv

You can download the old Java build system, Apache Ant, from 2003 and it still runs without issue: https://archive.apache.org/dist/ant/binaries/ https://archive.apache.org/dist/ant/binaries/ Download the bin.zip distribution, unzip it, then run this comand: java -cp "lib/*" org.apache.tools.ant.Main It runs on Java 21 without issues :D. Java is like Windows: it can run stuff written for it forever.