Allow Kryo serializer registration

build.gradle

@@ -65,7 +65,7 @@ subprojects {
     implementation 'com.google.guava:guava:31.1-jre'
 
     implementation "org.reflections:reflections:${reflectionsVersion}"
-    implementation 'com.esotericsoftware.kryo:kryo5:5.3.0'
+    api 'com.esotericsoftware.kryo:kryo5:5.3.0'
 
     implementation('commons-io:commons-io:2.11.0'){
       exclude group: 'commons-logging', module: 'commons-logging'

utils/src/main/java/com/nedap/archie/util/KryoUtil.java

@@ -1,25 +1,34 @@
 package com.nedap.archie.util;
 
 import com.esotericsoftware.kryo.kryo5.Kryo;
+import com.esotericsoftware.kryo.kryo5.Serializer;
 import com.esotericsoftware.kryo.kryo5.util.Pool;
 
+import java.util.HashMap;
 
 /**
  * Created by pieter.bos on 03/11/15.
  */
 public class KryoUtil {
 
     // Build pool with SoftReferences enabled (optional)
-    private static Pool<Kryo> pool;
+    private static final Pool<Kryo> pool;
+
+    @SuppressWarnings("rawtypes")
+    private static final HashMap<Class, Serializer> serializers = new HashMap<>();
 
     static {
         // Pool constructor arguments: thread safe, soft references, maximum capacity
         pool = new Pool<Kryo>(true, false) {
-            protected Kryo create () {
+            protected Kryo create() {
                 Kryo kryo = new Kryo();
+
                 kryo.setRegistrationRequired(false);
                 kryo.setReferences(true);
                 kryo.setCopyReferences(true);
+
+                serializers.forEach(kryo::register);
+
                 return kryo;
             }
         };
@@ -29,4 +38,9 @@ protected Kryo create () {
     public static Pool<Kryo> getPool() {
         return pool;
     }
+
+    @SuppressWarnings("rawtypes")
+    public static void addSerializer(Class clazz, Serializer serializer) {
+        serializers.put(clazz, serializer);
+    }
 }