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@SerialVersionUID is silently ignored if not provided as long literal #6988

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scabug opened this issue Jan 18, 2013 · 3 comments

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commented Jan 18, 2013

It seems that if you provide serial version UID to the annotation as anything else rather than long literal scala compiler just silently ignores its value.

It should either accept the value or raise an error, failing the compilation.

case class User()

@SerialVersionUID(13.asInstanceOf[Long]) case class IdentifyMessage1(userName: String, user: User, code: Int)
@SerialVersionUID(13l) case class IdentifyMessage2(userName: String, user: User, code: Int)
val SerialUID = "13".toLong
@SerialVersionUID(SerialUID) case class IdentifyMessage3(userName: String, user: User, code: Int)

println("#1 " + java.io.ObjectStreamClass.lookup(IdentifyMessage1("hei", User(), 8).getClass).getSerialVersionUID)
println("#2 " + java.io.ObjectStreamClass.lookup(IdentifyMessage2("hei", User(), 8).getClass).getSerialVersionUID)
println("#3 " + java.io.ObjectStreamClass.lookup(IdentifyMessage3("hei", User(), 8).getClass).getSerialVersionUID)

Running this code should print out 13 for all classes, but only #2 is correct.

#1 -7748233784455101520
#2 13
#3 1213360818062299825
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commented Jan 18, 2013

Imported From: https://issues.scala-lang.org/browse/SI-6988?orig=1
Reporter: Artūras Šlajus (arturaz)
Affected Versions: 2.9.2, 2.10.0
See #8549

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commented Jan 18, 2013

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commented May 5, 2014

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