Some point-of-sale (POS) systems, industrial controllers, and set-top boxes run embedded Java that was never upgraded past 1.4.0. Maintenance requires the exact matching JRE/JDK.
You cannot install Java 1.4.0 directly on modern OSs like Windows 11, macOS Sequoia, or recent Linux distributions. You will need virtualization. How to Install and Run Java 1.4.0 in 2026 java 1.4 0 download
Because Java 1.4.0 has for over 15 years, follow these rules strictly: Some point-of-sale (POS) systems
Depending on your target operating system, the installation steps for these archived packages vary. Windows Installation java 1.4 0 download