Fixed instant handling in the nested object

subprojects/micronaut-aws-sdk-dynamodb/src/main/groovy/com/agorapulse/micronaut/aws/dynamodb/DefaultDynamoDBService.groovy

@@ -119,6 +119,27 @@ class DefaultDynamoDBService<TItemClass> implements DynamoDBService<TItemClass>
 
             }
         )
+        .addFirstType(Instant,
+            new ArgumentMarshaller() {
+
+                @Override
+                AttributeValue marshall(Object obj) {
+                    return obj == null ? null : new AttributeValue().withS(serializeDate((Instant) obj))
+                }
+
+            },
+            new ArgumentUnmarshaller() {
+
+                @Override
+                void typeCheck(AttributeValue value, Method setter) { }
+
+                @Override
+                Object unmarshall(AttributeValue value) throws ParseException {
+                    return value.s == null ? null : Instant.from(Instant.parse(value.s))
+                }
+
+            }
+        )
         .build()
 
     // Specific ranges ending with 'Index' are String concatenated indexes,

subprojects/micronaut-aws-sdk-dynamodb/src/main/groovy/com/agorapulse/micronaut/aws/dynamodb/convert/InstantConverter.java

@@ -0,0 +1,34 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright 2018-2024 Agorapulse.
+ *
+ * Licensed 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
+ *
+ *     https://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 com.agorapulse.micronaut.aws.dynamodb.convert;
+
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBTypeConverter;
+
+import java.time.Instant;
+
+public class InstantConverter implements DynamoDBTypeConverter<String, Instant> {
+
+    public String convert(Instant instant) {
+        return instant.toString();
+    }
+
+    public Instant unconvert(String date) {
+        return Instant.parse(date);
+    }
+
+}

subprojects/micronaut-aws-sdk-dynamodb/src/test/groovy/com/agorapulse/micronaut/aws/dynamodb/DynamoDBEntity.java

@@ -19,7 +19,9 @@
 
 import com.amazonaws.services.dynamodbv2.datamodeling.*;
 
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.List;
 import java.util.Objects;
 
 @DynamoDBTable(tableName = "entity")
@@ -46,6 +48,8 @@ public class DynamoDBEntity {
     @DynamoDBTypeConvertedEnum
     State state = State.UNKNOWN;
 
+    private List<LogEntry> logs = new ArrayList<>();
+
     public String getParentId() {
         return parentId;
     }
@@ -103,6 +107,14 @@ public void setState(State state) {
         this.state = state;
     }
 
+    public List<LogEntry> getLogs() {
+        return logs;
+    }
+
+    public void setLogs(List<LogEntry> logs) {
+        this.logs = logs;
+    }
+
     //CHECKSTYLE:OFF
     @Override
     public boolean equals(Object o) {

subprojects/micronaut-aws-sdk-dynamodb/src/test/groovy/com/agorapulse/micronaut/aws/dynamodb/DynamoDBServiceTest.java

@@ -27,6 +27,7 @@
 import java.time.temporal.ChronoUnit;
 import java.util.Arrays;
 import java.util.Date;
+import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -161,6 +162,7 @@ private DynamoDBEntity createEntity(String parentId, String id, String rangeInde
         entity.setId(id);
         entity.setRangeIndex(rangeIndex);
         entity.setDate(date);
+        entity.setLogs(List.of(LogEntry.create("test")));
         return entity;
     }
 }

subprojects/micronaut-aws-sdk-dynamodb/src/test/groovy/com/agorapulse/micronaut/aws/dynamodb/LogEntry.java

@@ -0,0 +1,56 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright 2018-2024 Agorapulse.
+ *
+ * Licensed 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
+ *
+ *     https://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 com.agorapulse.micronaut.aws.dynamodb;
+
+import com.agorapulse.micronaut.aws.dynamodb.convert.InstantConverter;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBDocument;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBTypeConverted;
+
+import java.time.Instant;
+
+@DynamoDBDocument
+public class LogEntry {
+
+    public static LogEntry create(String message) {
+        LogEntry entry = new LogEntry();
+        entry.timestamp = Instant.now();
+        entry.message = message;
+        return entry;
+    }
+
+    @DynamoDBTypeConverted(converter = InstantConverter.class)
+    private Instant timestamp;
+    private String message;
+
+    public Instant getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(Instant timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+}