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Is it necessary to implement Serializable?
Implement the Serializable interface when you want to be able to convert an instance of a class into a series of bytes or when you think that a Serializable object might reference an instance of your class. Serializable classes are useful when you want to persist instances of them or send them over a wire.
Does hibernate require persistent classes to implement Serializable?
Hibernate does not require serializable at all.
Can we serialize class without implementing Serializable interface?
No. If you want to serialise an object it must implement the tagging Serializable interface. Cloning gives you another copy of an objcet so you can play with it without altering the original fields.
What is composite ID class?
A composite Id consists of multiple database columns mapped to a id class. There are two options to map a composite Id: @IdClass. @EmbeddedId.
What happens if I don’t implement Serializable?
If our class does not implement Serializable interface, or if it is having a reference to a non- Serializable class, then the JVM will throw NotSerializableException . All transient and static fields do not get serialized.
What happens if we don’t implement serialization?
What happens if you try to send non-serialized Object over network? When traversing a graph, an object may be encountered that does not support the Serializable interface. In this case the NotSerializableException will be thrown and will identify the class of the non-serializable object.
Should POJO implements Serializable?
Mostly JPA implementations do run in Distributed manner and Use caching, thus this POJO is required to implement Serializable. Show activity on this post. The term “POJO” was invented to seperate between lightweight and heavyweight EJB concepts. POJOs do not require you to implement anything.
Should DTO implement Serializable?
An Object needs to be serialized before being stored in a database because you do not and cannot wish to replicate the dynamically changing arrangement of system memory.
How can we avoid serialization?
To avoid Java serialization you need to implement writeObject() and readObject() method in your Class and need to throw NotSerializableException from those method.
How do you serialize a non Serializable class?
You can’t serialise a class that doesn’t implement Serializable , but you can wrap it in a class that does. To do this, you should implement readObject and writeObject on your wrapper class so you can serialise its objects in a custom way. First, make your non-serialisable field transient .
What will happen if a class is Serializable but its superclass does not?
Case 2(a): What happens when a class is serializable, but its superclass is not? Serialization: At the time of serialization, if any instance variable inherits from the non-serializable superclass, then JVM ignores the original value of that instance variable and saves the default value to the file.
Why do we need serialization ID in Java?
The SerialVersionUID must be declared as a private static final long variable in Java. This number is calculated by the compiler based on the state of the class and the class attributes. This is the number that will help the JVM to identify the state of an object when it reads the state of the object from a file.
What is composite id in hibernate?
A composite primary key is mapped using an Embeddable type in hibernate. We’ll first create an Embeddable type called EmployeeIdentity containing the employeeId and companyId fields, and then create the Employee entity which will embed the EmployeeIdentity type.
How do I create a composite key in JPA?
In JPA, we have two options to define the composite keys: the @IdClass and @EmbeddedId annotations. In order to define the composite primary keys, we should follow some rules: The composite primary key class must be public. It must have a no-arg constructor.
How do you achieve composite key in JPA with Hibernate?
- The composite key class should be public.
- The composite key class must implement the Serializable interface.
- The class must have a constructor.
- The class should have equals() and hashCode() methods.
Why is serialization needed?
Serialization allows the developer to save the state of an object and re-create it as needed, providing storage of objects as well as data exchange. Through serialization, a developer can perform actions such as: Sending the object to a remote application by using a web service.
When should we use serialization?
Here are some examples of using serialization: – Storing data in an object-oriented way to files on disk, e.g. storing a list of Student objects. – Saving program’s states on disk, e.g. saving state of a game. – Sending data over the network in form objects, e.g. sending messages as objects in chat application.
Why should we use Serializable in Java?
Serialization in Java is the concept of representing an object’s state as a byte stream. The byte stream has all the information about the object. Usually used in Hibernate, JMS, JPA, and EJB, serialization in Java helps transport the code from one JVM to another and then de-serialize it there.
Why do we need SerialVersionUID in Java?
The SerialVersionUID must be declared as a private static final long variable in Java. This number is calculated by the compiler based on the state of the class and the class attributes. This is the number that will help the JVM to identify the state of an object when it reads the state of the object from a file.
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Serializing an object with out implementing Serializable (Java in General forum at Coderanch)
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Tại sao lớp composite-id phải triển khai Serializable?
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Tại sao lớp composite-id phải triển khai Serializable?
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The Ultimate Guide on Composite IDs in JPA Entities
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Do We Need Composite keys at All
Two Ways to Implement a Composite Key
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References in composite keys
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When should we implement Serializable interface?
The answer to this question is, perhaps surprisingly, never, or more realistically, only when you are forced to for interoperability with legacy code. This is the recommendation in Effective Java, 3rd Edition by Joshua Bloch:
There is no reason to use Java serialization in any new system you write
Oracle’s chief architect, Mark Reinhold, is on record as saying removing the current Java serialization mechanism is a long-term goal.
Why Java serialization is flawed
Java provides as part of the language a serialization scheme you can opt in to, by using the Serializable interface. This scheme however has several intractable flaws and should be treated as a failed experiment by the Java language designers.
It fundamentally pretends that one can talk about the serialized form of an object. But there are infinitely many serialization schemes, resulting in infinitely many serialized forms. By imposing one scheme, without any way of changing the scheme, applications can not use a scheme most appropriate for them.
It is implemented as an additional means of constructing objects, which bypasses any precondition checks your constructors or factory methods perform. Unless tricky, error prone, and difficult to test extra deserialization code is written, your code probably has a gaping security weakness.
Testing interoperability of different versions of the serialized form is very difficult.
Handling of immutable objects is troublesome.
What to do instead
Instead, use a serialization scheme that you can explicitly control. Such as Protocol Buffers, JSON, XML, or your own custom scheme.
Do Hibernate table classes need to be Serializable?
I have inherited a Websphere Portal project that uses Hibernate 3.0 to connect to a SQL Server database.
There are about 130 Hibernate table classes in this project. They all implement Serializable. None of them declare a serialVersionUID field, so the Eclipse IDE shows a warning for all of these classes.
Is there any actual need for these classes to implement Serializable?
If so, is there any tool to add a generated serialVersionUID field to a large number of classes at once (just to make the warnings go away) ?
Composite Id
Composite Id
A composite Id consists of multiple database columns mapped to a id class. There are two options to map a composite Id:
@IdClass
@EmbeddedId
Important: You must overwrite equals and hashCode for composite id classes. If not Hibernate will think that the following id classes are different.
BoxTurtleId b1 = new BoxTurtleId(“Bad Vilbel”, “Roman salad”); BoxTurtleId b2 = new BoxTurtleId(“Bad Vilbel”, “Roman salad”); b1.equals(b2);
Eclipse and probably most IDEs provides a generator function for this. In Eclipse it is right click on the source → source → Generate hashCode, equals. You will find a detailed explanation about equals and hashCode in the next chapter.
Let’s have a look at an example: The famous box turtle for example can be clearly identified by its locations and the favourite salad. We will map it with an @EmbeddedId.
BoxTurtle class.
import java.io.Serializable; import javax.persistence.EmbeddedId; import javax.persistence.Entity; @Entity public class BoxTurtle implements Serializable { @EmbeddedId private BoxTurtleId id;
Id class.
import java.io.Serializable; public class BoxTurtleId implements Serializable { private String location; private String favoriteSalad;
The primary key fields are included in the Id class. The BoxTurtle class only references the Id class.
Same as XML mapping:
BoxTurtle.hbm.xml.
……… snip ……… Usage examples.
/* save/create a box turtle */ BoxTurtleId boxTurtleId = new BoxTurtleId(“Bad Vilbel”, “Roman salad”); BoxTurtle boxTurtle = new BoxTurtle(); boxTurtle.setId(boxTurtleId); session.save(boxTurtle); /* get a box turtle from db */ BoxTurtleId boxTurtleId = new BoxTurtleId(“Bad Vilbel”, “Roman salad”); BoxTurtle boxTurtleReloaded = (BoxTurtle) session.get( BoxTurtle.class, boxTurtleId); /* find a box turtle */ List
turtles = session.createQuery( “from BoxTurtle b where b.id.favouriteSalad = :salad”) .setString(“salad”, “Roman salad”).list(); The SpottetTurtle is totally different from its outlook but can identified by its location and its favourite salad as well. We will map it as @IdClass. The main difference is that the fields location and favoriteSalad are included in the Turtle class and the Id class. I recommend the first approach, as it provides less redundancy and is clearer in the class model.
Classes Tables
SpottedTurtle class.
import java.io.Serializable; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.IdClass; @Entity @IdClass(SpottedTurtleId.class) public class SpottedTurtle implements Serializable { @Id private String location; @Id private String favoriteSalad;
SpottedTurtleId.
import java.io.Serializable; import de.laliluna.utils.ClassUtils; public class SpottedTurtleId implements Serializable { private String location; private String favoriteSalad;
The same as XML mapping:
…….. snip ………. Usage examples.
/* create or save a turtle */ SpottedTurtle spottedTurtle = new SpottedTurtle(“Leipzig”, “Greek salad”, “Daniel”); session.save(spottedTurtle); /* get a box turtle from db */ SpottedTurtleId spottedTurtleId = new SpottedTurtleId(“Leipzig”, “Greek salad”); SpottedTurtle spottedTurtleReloaded = (SpottedTurtle) session.get( SpottedTurtle.class, spottedTurtleId); /* find a box turtle */ List
turtles = session.createQuery( “from SpottedTurtle b where b.favouriteSalad = :salad”) .setString(“salad”, “Roman salad”).list();
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