I am working with Eclipse and want to create a Blackboard Building Block war. I'm using code that has already been used to create these before, but I had to re-install Eclipse. Once I had Eclipse 4.17.0 (2020) installed, I was unable to find the export to war option. Now, keep in mind you can export to war using a build tool like maven or ant or just the Java JDK and the command line, but I was feeling bugged I didn't have the option in the IDE.
Install Eclipse for Enterprise Java Development, not the Java EE.