Expand my Community achievements bar.

Nomination window for the Adobe Community Advisor Program, Class of 2025, is now open!
SOLVED

Usage of serialVersionUID in custom servlets which extends SlingSafeMethodsServlet

Avatar

Level 8

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.

1 Accepted Solution

Avatar

Correct answer by
Level 4

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.

View solution in original post

5 Replies

Avatar

Level 4

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.

Avatar

Level 10

Avatar

Correct answer by
Level 4

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.

Avatar

Level 10

Avatar

Level 8

Thanks a lot Scott and Daniel for your replies.