MisterBrums

Had the same problem. Running macOS Catalina 10.15.6. Installed Java 8 from Oracle's website, as suggested in this post. However, it's true that even after installing java 8, the "java" command still links to the built-in installed java. This can be checked by typing java -version Which outputs : java version "14.0.2" 2020-07-14 You can also see where the binary is by typing whereis java Result: /usr/bin/java After a bit of searching, the Java 8 binary, on the Mac, when installed from Oracle, is at: /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java This is the correct binary, as shown by checking the version: "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/./java" -version Result: java version "1.8.0_261" Here is my working startup script: #!/bin/bash cd "$(dirname "$0")" "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/./java" -Xms4G -Xmx4G -jar forge-1.12.2-14.23.5.2854.jar Note that you need to either quote the path or escape the space. Hope it helps