If you are seeing warning icons indicating you cannot place Java onto the disk because a newer version of the package is already installed, such as: Some users have also experienced their previously existing legacy Java libraries have been moved or quarantined. Attempts to reinstall legacy Java libraries upon upgrade of the OS may result in errors restricting installation. Java 6 cannot currently be installed on macOS 10.15 Catalina because there is a newer version of Java installed on the system. 元Harris Geospatial Development is working to move off this legacy Java 6 dependency, but for now you will require this version to be installed on your MacOS.

Java 6 is used by the IDL Development Environment, by ENVI, bridge processes, as well as some newer graphics routines. This article addresses ENVI/IDL's current dependency on legacy Java 6 libraries.