diff --git a/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/Customer.java b/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/Customer.java
index 6bd1c24869..3e214d58f9 100644
--- a/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/Customer.java
+++ b/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/Customer.java
@@ -9,6 +9,7 @@ import javax.persistence.Id;
 import javax.persistence.Table;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 @Entity
@@ -74,7 +75,7 @@ public class Customer {
     }
 
     public void deserializeCustomerAttributes() throws IOException {
-        this.customerAttributes = objectMapper.readValue(customerAttributeJSON, Map.class);
+        this.customerAttributes = objectMapper.readValue(customerAttributeJSON,  new TypeReference<Map<String, Object>>() {});
     }
 
 }
diff --git a/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/HashMapConverter.java b/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/HashMapConverter.java
index b1c2d50480..5f3482b36f 100644
--- a/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/HashMapConverter.java
+++ b/persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/persistjson/HashMapConverter.java
@@ -1,6 +1,7 @@
 package com.baeldung.hibernate.persistjson;
 
 import java.io.IOException;
+import java.util.HashMap;
 import java.util.Map;
 
 import javax.persistence.AttributeConverter;
@@ -10,6 +11,7 @@ import org.slf4j.LoggerFactory;
 
 import com.baeldung.hibernate.interceptors.CustomInterceptor;
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 public class HashMapConverter implements AttributeConverter<Map<String, Object>, String> {
@@ -36,7 +38,7 @@ public class HashMapConverter implements AttributeConverter<Map<String, Object>,
 
         Map<String, Object> customerInfo = null;
         try {
-            customerInfo = objectMapper.readValue(customerInfoJSON, Map.class);
+            customerInfo = objectMapper.readValue(customerInfoJSON, new TypeReference<HashMap<String, Object>>() {});
         } catch (final IOException e) {
             logger.error("JSON reading error", e);
         }