Examples of using Serialversionuid in English and their translations into Bengali
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Colloquial
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Ecclesiastic
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Computer
This number is called serialVersionUID.
SerialVersionUID facilitates versioning of serialized data.
This version number is known as SerialVersionUID in Java.
This serialVersionUID calculation algorithm varies from one JRE to another.
Since most of the time the default serialVersionUID is sufficient.
In such cases serialVersionUID associated with serialized object will be different than the serialVersionUID of class calculated at deserialzation environment.
Eclipse issues warnings when a serialVersionUID is missing.
The serialVersionUID represents your class version, and you should increment it if the current version of your class is not backwards compatible with its previous version.
You can tell Eclipse to ignore these serialVersionUID warnings:.
It's recommended to declare SerialVersionUID as private static final long variable to avoid default mechanism.
Changing any of these in any way will change the serialVersionUID.
NOTE: Now change the serialVersionUID of the Employee class and save:.
The serializable class Foodoes not declare a static final serialVersionUID field of type long.
This custom code can then check the serialVersionUID in order to know which version the data is in and decide how to de-serialize it.
So to help this usecase, the Java platform offers you a choice of not setting the serialVersionUID manually.
Therefore, you must declare serialVersionUID because it give us more control.
Class implements the Serializable interface, so eclipse automatically offered to declare the serialVersionUID field.
Please show an example where missing serialVersionUID will cause a problem.
One case where the warning(or the serialVersionUID) is unavoidable is when you extend from AbstractAction, normally in a anonymous class, only adding the actionPerformed-method.
Lst includes the list of java files to add the serialVersionUID in the following format:.
Furthermore, sometimes you just want for some reason to forbiddeserialization of old serialized objects[backward incompatibility], and in this case you just have to change the serialVersionUID.
A serializable class can declare its own serialVersionUID explicitly by declaring a field named"serialVersionUID" that must be static, final, and of type long:.
So to avoid suchsituations/issues programmer must always specify serialVersionUID of Serializable class.
The default serialVersionUID computation is highly sensitive to class details that may vary depending on compiler implementations, and can thus result in unexpected InvalidClassExceptions during deserialization.
When a Serializable class object is serialized JavaRuntime associates a serial version no.(called as serialVersionUID) with this serialized object.
SerialVersionUID is a unique identifier for each class, JVM uses it to compare the versions of the class ensuring that the same class was used during Serialization is loaded during Deserialization.
I come up the following bash script(I'm sorry for Windows users, consider buy a Mac or convert to Linux)to make amending serialVersionUID issue with ease:.
If you want to version your data, you normally start with a serialVersionUID of 0, and bump it with every structural change to your class which alters the serialized data(adding or removing non-transient fields).
If you ignore them for now, and find later that you need to change the class in some way but maintain compatibility w/ old version of the class,you can use the JDK tool serialver to generate the serialVersionUID on the old class, and explicitly set that on the new class.
In case if programmer specifies the serialVersionUID value explicitly in the program then the same value will be associated with the serialized object and the class, irrespective of the serialization and deserialzation platform(for ex. serialization might be done on platform like windows by using sun or MS JVM and Deserialization might be on different platform Linux using Zing JVM).