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cquser1
cquser1
Level 7
Apr 5, 2017 12:00 PM UTC
Solved

Usage of serialVersionUID in custom servlets which extends SlingSafeMethodsServlet

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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    daniel_henriqu1
    daniel_henriqu1Accepted solution
    Level 4
    Apr 5, 2017 2:52 PM UTC

    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.

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    5 replies

    daniel_henriqu1
    daniel_henriqu1
    Level 4
    Apr 5, 2017 1:39 PM UTC

    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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      daniel_henriqu1
      daniel_henriqu1Accepted solution
      Level 4
      Apr 5, 2017 2:52 PM UTC

      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.

      Translate
      smacdonald2008
      smacdonald2008
      Level 10
      Apr 5, 2017 3:19 PM UTC

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

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      cquser1
      cquser1Author
      Level 7
      Apr 6, 2017 10:08 AM UTC

      Thanks a lot Scott and Daniel for your replies.

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