Finished work on the JPackage call, placed it inside separate profile Image.

src/main/java/de/kneitzel/JavaFXApp.java

@@ -1,24 +1,17 @@
 package de.kneitzel;
 
 import javafx.application.Application;
-import javafx.application.Platform;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
-import javafx.scene.control.Button;
-import javafx.scene.layout.AnchorPane;
-import javafx.scene.layout.StackPane;
 import javafx.stage.Stage;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 
 import java.io.IOException;
 
 public class JavaFXApp extends Application {
-	static final Logger logger = LogManager.getLogger(JavaFXApp.class);
 
 	@Override
-	public void start(Stage primaryStage) throws IOException {
+	public void start(Stage primaryStage) {
 		try {
 			primaryStage.setTitle("Hello World!");
 			FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("MainWindow.fxml"));
@@ -26,16 +19,12 @@ public class JavaFXApp extends Application {
 			primaryStage.setScene(new Scene(root));
 			primaryStage.show();
 		} catch (Exception ex) {
-			logger.error("Exception!", ex);
+			System.out.println("Exception: " + ex.getMessage());
+			ex.printStackTrace();
 		}
 	}
 
 	public static void main(String[] args) {
-		logger.warn("Starting ...");
-		try {
 			launch(args);
-		} catch (Exception ex) {
-			logger.error("Exception!", ex);
-		}
 	}
 }

src/main/java/de/kneitzel/Main.java

@@ -0,0 +1,15 @@
+package de.kneitzel;
+
+/**
+ * Another Main class as workaround when the JavaFX Application ist started without
+ * taking care os Classloader Requirements of JavaFX. (Important when starting from inside NetBeans!)
+ */
+public class Main {
+    /**
+     * Additional main methode to start Application.
+     * @param args Commandline Arguments.
+     */
+    public static void main(String[] args) {
+        JavaFXApp.main(args);
+    }
+}

src/main/resources/log4j2.xml

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Configuration status="INFO">
-    <Appenders>
-        <Console name="Console" target="SYSTEM_OUT">
-            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
-        </Console>
-        <File name="MyFile" fileName="all.log" immediateFlush="false" append="false">
-            <PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
-        </File>
-    </Appenders>
-    <Loggers>
-        <Root level="debug">
-            <AppenderRef ref="Console" />
-            <AppenderRef ref="MyFile"/>
-        </Root>
-    </Loggers>
-</Configuration>