print existing fonts.

src/main/java/de/kreth/invoice/Application.java

@@ -1,5 +1,6 @@
 package de.kreth.invoice;
 
+import java.awt.GraphicsEnvironment;
 import java.util.PropertyResourceBundle;
 import java.util.ResourceBundle;
 
@@ -30,6 +31,13 @@ public class Application extends SpringBootServletInitializer implements AppShel
     private static ResourceBundle bundle = null;
 
     public static void main(String[] args) {
+	String[] names = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
+
+	System.out.println("Found " + names.length + " fonts:");
+
+	for (String name : names) {
+	    System.out.println(name);
+	}
 	SpringApplication.run(Application.class, args);
     }