Question

Is there any viable reason why serialVersionUID field is not named SERIAL_VERSION_UID?

According to the docs for java.io.Serializable:

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;

While referring Java Naming Conventions all static final (constants) fields should be capitilized having its fragments separated with an underscore.

Answer 1

Probably because serialVersionUID was defined in the Java serialization API before such conventions existed.

I found a document published by Sun in 1997 called Java Code Conventions that says in Section 9 on page 16 “The names of variables declared class constants and of ANSI
constants should be alluppercase with words separated by underscores (“”).”_

So my guess is that Sun just didn’t enforce their own standards on their own code.