Done Category, Product Catalogue, Customer, Vendor, Purchase Invoice Module

kifi-api/test_flux.java

@@ -0,0 +1,11 @@
+import reactor.core.publisher.Flux;
+public class test_flux {
+    public static void main(String[] args) {
+        try {
+            Flux.fromIterable(null).subscribe();
+            System.out.println("Did not throw");
+        } catch(Exception e) {
+            System.out.println("Threw: " + e.getClass().getName());
+        }
+    }
+}