Fix illegal state exception when closing application, fixes #97

webcam-capture/src/main/java/com/github/sarxos/webcam/Webcam.java

@@ -247,7 +247,7 @@ public boolean close() {
 
 			// remove shutdown hook (it's not more necessary)
 
-			Runtime.getRuntime().removeShutdownHook(hook);
+			removeShutdownHook();
 
 			// notify listeners
 
@@ -317,17 +317,23 @@ protected void dispose() {
 			}
 		}
 
+		removeShutdownHook();
+
+		LOG.debug("Webcam disposed {}", getName());
+	}
+
+	private void removeShutdownHook() {
+
 		// hook can be null because there is a possibility that webcam has never
 		// been open and therefore hook was not created
+
 		if (hook != null) {
 			try {
 				Runtime.getRuntime().removeShutdownHook(hook);
 			} catch (IllegalStateException e) {
 				LOG.trace("Shutdown in progress, cannot remove hook");
 			}
 		}
-
-		LOG.debug("Webcam disposed {}", getName());
 	}
 
 	/**