Scala compiler throws annotation argument needs to be a constant error on constant argument -

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i'm using following annotation parameter shipped spark-sql:

@sqluserdefinedtype(udt = actionudt.clazz) trait action extends actionlike { ...implementation }

where actionudt.clazz defined constant val:

object actionudt extends actionudt {   final val clazz: class[_ <: actionudt] = this.getclass }

but got following compiler error:

error:(25, 37) annotation argument needs constant; found: actionudt.clazz @sqluserdefinedtype(udt = actionudt.clazz)                                     ^

why produce such false alarm? bug? i'm using scala 2.10.5

a class not constant object defined here. constant .. .. constant in numeric or string literal.


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