I'm very new to Eclipse (I used to use InteliJ) and I've got much of it sorted out but this is an issue that I just can't wrap my head arounds. I'm not sure if this has been asked already and I'm simply not asking the correct question so please be merciful. I need to emphasize that this code worked as intended when I was running it in InteliJ so it's not an issue with the code as far as I can see.
The program uses JavaFX and the bi-directional hashmap from the commons.collections and JavaFX does run properly.
The issue occurs when I attempt to use the commons.collections in the eclipse project. I added the library in the same way that I added the JavaFX files but when it runs, I get this error message.
java.lang.ClassNotFoundException: org.apache.commons.collections4.BidiMap
I'm not sure what I'm doing wrong and my google searches just keep turning me towards Maven but I don't want to use Maven if I can avoid it. 
I've included a picture of the library setup from InteliJ as well and from what I can tell, I need to include the Javadocs folder but I can't seem to find out how. Nothing I've done thus far has given much of a hint.
I really appreciate any help at all!
UPDATE
I added the commons-collections4-4.4 to my class path and the same error is occurring.
Picture Included
In order to fix my issue, I needed to add the library to my class path. I had added it to my module path but that simply wasn't enough as it turns out.
This page can be accessed using
properties -> Java Build Path -> libraries.
One thing I learned is that it's best to click the "Add External JARS..." and not "Add External Class Folder".
Here's an example of my final configuration.