Should implement serializable

Raedwald Raedwald I think it's the best answer! The answer we need! What about this Sonar rule rules. Sounds outdated to me, but does someone know more? The only way so far that I know for your app to survive Tomcat restart is to implement serialization on all items stored in session scope beans.

I can guess there is another way but way back some years ago that was legal way to go. Show 1 more comment. Steve Emmerson Steve Emmerson 7, 5 5 gold badges 32 32 silver badges 58 58 bronze badges. Sign up or log in Sign up using Google.

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Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Visit chat. Any attempt to serialize or deserialize our object will now always result in the exception being thrown.

And since those methods are declared as private , nobody can override your methods and change them. However, this is a violation of the Liskov Substitution Principle. And writeReplace and readResolve methods can be used to achieve singleton-like behaviours.

These methods are used to allow an object to provide an alternative representation for itself within an ObjectStream. In simple words, readResolve can be used to change the data that is deserialized through the readObject method, and writeReplace can be used to change the data that is serialized through writeObject.

Java serialization can also be used to deep clone an object. Java cloning is the most debatable topic in Java community and it surely does have its drawbacks but it is still the most popular and easy way of creating a copy of an object until that object is full filling mandatory conditions of Java cloning. You can find the complete source code for this article on this GitHub repository , and please feel free to provide your valuable feedback.

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Here's everything you need to know about serialization in Java. Like Join the DZone community and get the full member experience. Join For Free. Generally, the complete process is called serialization, but I think it is better to classify both as separate for more clarity: The serialization process is platform independent, an object serialized on one platform can be deserialized on a different platform.

When a class implements the Serializable interface, all its sub-classes are serializable as well. But when an object has a reference to another object, these objects must implement the Serializable interface separately. The Transient and Static Fields Do Not Get Serialized If we want to serialize one object but do not want to serialize specific fields, then we can mark those fields as transient.

In the above example, Student class implements Serializable interface. Now its objects can be converted into stream. The main class implementation of is showed in the next code. Only objects that support the java. Serializable interface can be written to streams. In this example, we are going to serialize the object of Student class from above code.

The writeObject method of ObjectOutputStream class provides the functionality to serialize the object. We are saving the state of the object in the file named f. Deserialization is the process of reconstructing the object from the serialized state. It is the reverse operation of serialization. Let's see an example where we are reading the data from a deserialized object.

If a class implements Serializable interface then all its sub classes will also be serializable. Let's see the example given below:. Parent class properties are inherited to subclasses so if parent class is Serializable, subclass would also be. If a class has a reference to another class, all the references must be Serializable otherwise serialization process will not be performed. In such case, NotSerializableException is thrown at runtime.

If there is any static data member in a class, it will not be serialized because static is the part of class not object. Rule: In case of array or collection, all the objects of array or collection must be serializable. If any object is not serialiizable, serialization will be failed.

On a side note, in general, blindly deserializing data is dangerous and could lead to security issues. As previously stated, these are sometimes also considered as serialization systems.

It often leads to a common misconception that implies the need for serialization of data transfer objects. In contrast, cross-platform structured-data representations and Java Serialization are independent of each other.

Using JSON, for instance, is enough for browser-server communication. As usual, the full source code of this article is available over on Github. Coding tutorials and news. The developer homepage gitconnected. Sign in.