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cquser1
cquser1
New Participant
April 5, 2017
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Usage of serialVersionUID in custom servlets which extends SlingSafeMethodsServlet

  • April 5, 2017
  • 5 replies
  • 3760 views

Hi All,

I have seen in multiple instances wherein serialVersionUID is assigned some random Long value in custom servlet. I am not sure as to why exactly is this used. Don't see this variable getting used anywhere.

Can someone please let me know as to what purpose does it serve.

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    Best answer by daniel_henriqu1

    Hi,

    serialVersionUID is a Java "thing" for Serializable classes: Stream Unique Identifiers.
    It's used by the regular Java serialization mechanism: Serializable Objects.

    Regarding the "random" long value it has probably been generated/assigned by an IDE (Eclipse, IntelliJ), based on the characteristics of the corresponding class.

    Some additional references about Servlets and serialization:

    1. Why does HttpServlet implement Serializable?
    2. Why do GenericServlet and HttpServlet implement the Serializable interface?

    Best regards,

    Daniel.

    5 replies

    cquser1
    cquser1Author
    New Participant
    April 6, 2017

    Thanks a lot Scott and Daniel for your replies.

    smacdonald2008
    smacdonald2008
    New Participant
    April 5, 2017

    See this thread -- http://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it

    daniel_henriqu1
    daniel_henriqu1Accepted solution
    New Participant
    April 5, 2017

    Hi,

    serialVersionUID is a Java "thing" for Serializable classes: Stream Unique Identifiers.
    It's used by the regular Java serialization mechanism: Serializable Objects.

    Regarding the "random" long value it has probably been generated/assigned by an IDE (Eclipse, IntelliJ), based on the characteristics of the corresponding class.

    Some additional references about Servlets and serialization:

    1. Why does HttpServlet implement Serializable?
    2. Why do GenericServlet and HttpServlet implement the Serializable interface?

    Best regards,

    Daniel.

    daniel_henriqu1
    daniel_henriqu1
    New Participant
    April 5, 2017

    Hi.

    serialVersionUID is a Java "thing" for Serializable classes: Stream Unique Identifiers.
    It's used by the regular Java serialization mechanism: Serializable Objects.

    Regarding the "random" long value, it has probably been generated/assigned by an IDE (Eclipse, IntelliJ), based on the characteristics of the corresponding class.

    Some additional references about Servlets and serialization:

    Best regards,

    Daniel.

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