A DESCRIPTION OF THE REQUEST :
EventType throws an exception if an event of the requested name already exists, however there is no alternative mechanism to get a reference to an existing event.

JUSTIFICATION :
ControlsFX uses the JavaFX event system. Due to the above limitation, the ControlsFX library can only be initialized in the JVM once. This reduces its ability to work in plugin-based systems.

For more information, see this ControlsFX support ticket:
https://bitbucket.org/controlsfx/controlsfx/issues/737/unsafe-eventtype-creation

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Provide a getter for existing events, or pass back a singleton reference of an event on the second one being requested.
ACTUAL -
IllegalArgumentException is thrown. No access to existing event instance is possible.

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* Use a URLClassLoader to load two jar file libraries - each of which come packaged with a ControlsFX dependency.

* Attempt to create an event of the same name twice.
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CUSTOMER SUBMITTED WORKAROUND :
None, other than to avoid it by providing the "JavaFX event using" library as a root-level, shared dependency.