At first glance, it’s just a JDK installer. But for those of us who lived through the "Dark Ages" of Java on the Mac, this specific filename is a milestone—the end of an era.
But, if you are spinning up an isolated, air-gapped VM to run a legacy ERP system from 2014, or you need to compile a time-traveling proof-of-concept... jdk-7u80-macosx-x64.dmg is your golden ticket. jdk-7u80-macosx-x64.dmg
Let’s crack open this DMG (figuratively, and maybe literally) and see what makes it special. Before Oracle took the reins, Java on macOS (then OS X) was a mess. Apple maintained its own proprietary port, which often lagged years behind the Windows/Linux versions. With Java 7, Oracle finally took over, and jdk-7u80 represents the last public update of the Java 7 lifecycle. At first glance, it’s just a JDK installer