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what is serialVersionUID , why it different for each bean? serialVersionUID = 42L;

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This id is used to identify the type of the class. This is required when you serialize and de serialize the object. If you have given a value to this id, this will be common for all the objects created out of this class. Please note this id is a static field.
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The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the...
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The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException. A serializable class can declare its own serialVersionUID explicitly by declaring a field named "serialVersionUID" that must be static, final, and of type long: ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; If a serializable class does not explicitly declare a serialVersionUID, then the serialization runtime will calculate a default serialVersionUID value for that class based on various aspects of the class, as described in the Java(TM) Object Serialization Specification. However, it is strongly recommended that all serializable classes explicitly declare serialVersionUID values, since 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. Therefore, to guarantee a consistent serialVersionUID value across different java compiler implementations, a serializable class must declare an explicit serialVersionUID value. It is also strongly advised that explicit serialVersionUID declarations use the private modifier where possible, since such declarations apply only to the immediately declaring class--serialVersionUID fields are not useful as inherited members. read less
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It represents the version number of the class. It mainly used during serialization and deserialization.
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IT Professional Trainer with 15 years of experience in IT Industry

The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the...
read more
The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException. A serializable class can declare its own serialVersionUID explicitly by declaring a field named "serialVersionUID" that must be static, final, and of type long: ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; If a serializable class does not explicitly declare a serialVersionUID, then the serialization runtime will calculate a default serialVersionUID value for that class based on various aspects of the class, as described in the Java(TM) Object Serialization Specification. However, it is strongly recommended that all serializable classes explicitly declare serialVersionUID values, since 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. Therefore, to guarantee a consistent serialVersionUID value across different java compiler implementations, a serializable class must declare an explicit serialVersionUID value. It is also strongly advised that explicit serialVersionUID declarations use the private modifier where possible, since such declarations apply only to the immediately declaring class--serialVersionUID fields are not useful as inherited members. read less
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Java J2EE

The serialVersionUID have to match during the serialization and deserialization process. The serialVersionUID is used as a version control in a Serializable class. If you do not explicitly declare a serialVersionUID, JVM will do it for you automatically, based on various aspects of your Serializable...
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ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; serialVersionUID is a static final field. You can assign any number of your choice to it. serialVersionUID is a must in serialization process. But it is optional for the developer to add it in java source file. If you are not going to...
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ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; serialVersionUID is a static final field. You can assign any number of your choice to it. serialVersionUID is a must in serialization process. But it is optional for the developer to add it in java source file. If you are not going to add it in java source file, serialization runtime will generate a serialVersionUID and associate it with the class. The serialized object will contain this serialVersionUID along with other data. Even though serialVersionUID is a static field, it gets serialized along with the object. This is one exception to the general serialization rule that, “static fields are not serialized”. serialVersionUID is a 64-bit hash of the class name, interface class names, methods and fields. Serialization runtime generates a serialVersionUID if you do not add one in source. Refer this link for the algorithm to generate serialVersionUID. It is advised to have serialVersionUID as unique as possible. Thats why the java runtime chose to have such a complex algorithm to generate it. read less
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Bean is a container of java classes. some java classes are not updated in the serial version UID ...This is a kind of ID to tell about the latest version and the java classes contained in the bean.
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Serialization UID is a 64 bit key which is unique, static with respect to an object. It has to be match during the serialization and deserialization process.
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The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the...
read more
The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException. A serializable class can declare its own serialVersionUID explicitly by declaring a field named "serialVersionUID" that must be static, final, and of type long: ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; A serializable class with a serialVersionUID of 1L. import java.io.Serializable; public class Address implements Serializable{ private static final long serialVersionUID = 1L; String street; String country; public void setStreet(String street){ this.street = street; } public void setCountry(String country){ this.country = country; } public String getStreet(){ return this.street; } public String getCountry(){ return this.country; } @Override public String toString() { return new StringBuffer(" Street : ") .append(this.street) .append(" Country : ") .append(this.country).toString(); } } read less
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IT professional trainer with experience of 7+ years in IT industry

The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the...
read more
The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException. A serializable class can declare its own serialVersionUID explicitly by declaring a field named "serialVersionUID" that must be static, final, and of type long: ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; read less
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