From bd78082c44950032130fb7a1831f1fa6bde37cab Mon Sep 17 00:00:00 2001
From: "Dr Heinz M. Kabutz" <heinz@javaspecialists.eu>
Date: Mon, 27 Mar 2023 17:10:46 +0300
Subject: [PATCH] Fixed dispatching to correct method and removed
 StackOverflowError

---
 src/io/github/mboegers/dop/invoice/MwStRechner.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/io/github/mboegers/dop/invoice/MwStRechner.java b/src/io/github/mboegers/dop/invoice/MwStRechner.java
index d9be839..5ad9444 100644
--- a/src/io/github/mboegers/dop/invoice/MwStRechner.java
+++ b/src/io/github/mboegers/dop/invoice/MwStRechner.java
@@ -18,7 +18,9 @@ private PlainOOP() {
          * ermöglicht einen einheitlichen Zugriff
          */
         public static double calculateMwSt(Kunde kunde, double wert) {
-            return calculateMwSt(kunde, wert);
+            if (kunde instanceof Privatkunde p) return calculateMwSt(p, wert);
+            else if (kunde instanceof Businesskunde b) return calculateMwSt(b, wert);
+            else throw new IllegalArgumentException("Unsupported type: " + kunde.getClass());
         }
 
         /**