↗️ This README only covers one section of the demo. The master branch contains more information.

Reflection Over Internals

Main uses reflection to create an instance of DisconnectedServiceObserver:

private static Object createDisconnected() throws Exception {
	Constructor<?> constructor = Class
		.forName("monitor.observer.DisconnectedServiceObserver")
		.getDeclaredConstructor();
	constructor.setAccessible(true);
	return constructor.newInstance();
}

The thing is, while DisconnectedServiceObserver is in an exported package it is not public and hence inaccessible. Accordingly, this results in an exception at run time:

Exception in thread "main" java.lang.reflect.InaccessibleObjectException:
Unable to make monitor.observer.DisconnectedServiceObserver() accessible:
module monitor.observer does not "opens monitor.observer" to module monitor
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:337)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:281)
    at java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:192)
    at java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:185)
    at monitor/monitor.Main.createDisconnected(Main.java:50)
    at monitor/monitor.Main.main(Main.java:25)