andi-huber commented on code in PR #1019:
URL: https://github.com/apache/isis/pull/1019#discussion_r921043096


##########
persistence/jpa/integration/src/main/java/org/apache/isis/persistence/jpa/integration/typeconverters/applib/IsisBookmarkConverter.java:
##########
@@ -0,0 +1,47 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.isis.persistence.jpa.integration.typeconverters.applib;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+import org.apache.isis.applib.services.bookmark.Bookmark;
+
+/**
+ * @since 2.0 {@index}
+ */
+@Converter(autoApply = true)
+public class IsisBookmarkConverter implements AttributeConverter<Bookmark, 
String> {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public String convertToDatabaseColumn(Bookmark bookmark) {
+        return bookmark != null
+                ? bookmark.toString()
+                        : null;
+    }
+
+    @Override
+    public Bookmark convertToEntityAttribute(String datastoreValue) {

Review Comment:
   we probably should fail if the bookmark cannot be parsed from non-empty 
_datastoreValue_:
   ```java
       public Bookmark convertToEntityAttribute(String datastoreValue) {
           return _Strings.isNotEmpty(datastoreValue)
                   ? Bookmark.parseElseFail(datastoreValue)
                   : null;
       }
   ```



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