Java Serialization

Serialize Object to String in Java

In Java, we can serialize an object to String in different ways such as converting to byte[] and thenBase64 encoded string, XML or JSON. Learn with examples.

Jackson – Custom Serializer and Deserializer

Learn to create custom Jackson serializers and deserializers, register using the SimpleModule as well as @JsonSerialize and @JsonDeserialize.

Jackson – Serialize and Deserialize Dates

By default, Jackson serializes the Dates in numeric format. Learn to customize the serialization and deserialization of date and time types in Java using Jackson.

Jackson – Custom Serialization and Deserialization of Booleans

Learn Jackson’s default serialization and deserialization of boolean values, and how to customize it to support other possible values.

Lombok Serialize and Deserialize @Builder Class

Learn to serialize and deserialize Lombok @Builder annotated class with Jackson library. For demo purpose, we are using Article class have few field members. We have created this class during the Lombok @Builder tutorial. 1. Serializing @Builder Class The serialization process is very simple and we do not do anything …

Python JSON – Custom Class Serialization

Learn to serialize a complex python class (e.g. User) and write serialized JSON data in file by extending JSONEncoder and custom serialization method. In Python serialize complex object to JSON example, we have following User class. Here, birthdate of type datetime. If we don’t use the custom serialization, we will …

Gson – Custom Serialization and Deserialization

Learn to use custom serialization and deserialization using two interfaces Gson JsonSerializer and JsonDeserializer to convert between json and java object.

Gson – Serialize and Deserialize a Map

Learn to serialize HashMap using Google Gson library. Also, learn to deserialize JSON string to HashMap containing custom Objects using Gson such that field values are copied into appropriate generic types. These conversions can be used to create deep cloning of the HashMap. 1. Maven Include the latest version of …

Serialize and Deserialize an ArrayList in Java

Learn to serialize and/or deserialize an ArrayList in Java with easy-to-follow examples. Note that the list items must also be Serializable.

JAXB Marshaller Example: Converting POJO to XML

The JAXB Marshaller interface is responsible for governing the process of serializing Java content trees i.e. Java objects to XML data. This marshalling from POJO to XML can be done to a variety of output targets. 1. Maven Start with adding the latest ‘jakarta‘ dependencies for adding the JAXB support …

Eclipse MOXy: Marshal Java Object to JSON

This Java tutorial uses JAXB and MOXy to marshal Java objects to JSON string or write JSON to file using simple examples.

Java Custom Serialization using readObject() and writeObject()

We may need custom serialization in java in many cases. For example, we have legacy java classes that we are not willing to modify for any reason. There can be some design constraints as well. Or even simply, the class is expected to be changed in future releases which could …

Serialize Java Object to XML using XMLEncoder

In this example, we will learn to serialize the java objects into XML files and then de-serialize them back to the original java objects.

Difference between Externalizable and Serializable in Java

Knowing the difference between Externalizable vs Serializable is important in two aspects, one – if could be asked as an interview question, two – you can use the knowledge to make better informed decision for performance improvement for applying serialization into your application.

Java Externalizable Example – More Efficient Serialization

You can achieve more efficient serialization by implementing Externalizable interface and overriding it’s methods writeExternal() and readExternal().

Java transient keyword example

The Java transient keyword is used on class attributes/variables to indicate that serialization process of such class should ignore such variables while creating a persistent byte stream for any instance of that class. A transient variable is a variable that can not be serialized. According to Java Language Specification [jls-8.3.1.3] …

Jackson – Marshal and Unmarshal Java Maps

Learn to convert JSON to Map and convert a Map to JSON string using Jackson 2. Given example uses Jackson ObjectMapper for conversions.

Guide to Java SerialVersionUID

Java SerialVersionUID example. Learn to create generate serialVersionUID for classes to be serialized. Learn to change serialversionuid correctly.

JAXB: Marshal / Unmarshal a Map in Java

We know that JAXB(Java Architecture for XML Binding) allows Java developers to map Java classes to XML representations. JAXB provides two main features: the ability to marshal Java objects into XML and the inverse, i.e. to unmarshal XML back into Java objects. JAXB mostly is used while implementing webservices or …

JAXB: Marshal / Unmarshal a List or Set

Java examples to marshal and unmarshal the collection of objects of type List and Set implementations such as ArrayList or HashSet into XML.

Java Deep Copy using In-memory Serialization

We all know that the easiest way of deep cloning (with some performance overhead) or deep copy is serialization. Java serialization involves serializing the object into bytes and from bytes to the object again. We suggest using in-memory deep cloning whenever it is the only need and we don’t need …