public void setListeners(Collection<String> listeners) {
        this.listeners = listeners;
    }
Sets the classnames of all listener classes within the extension.
These classnames are defined within the manifest by the "listeners"
property as an array of strings, where each string is a listener
class name.

@param listeners
     A collection of classnames for all listeners within the extension.
guacamole/src/main/java/org/apache/guacamole/extension/ExtensionManifest.java