Comments on: Dealing with NULLs in ScalaQuery http://szeiger.de/blog/2009/06/20/dealing-with-nulls-in-scalaquery/ Stefan Zeiger's Software Development Weblog Fri, 16 Dec 2011 10:09:44 +0100 http://wordpress.org/?v=2.8.4 hourly 1 By: Stefan Zeiger http://szeiger.de/blog/2009/06/20/dealing-with-nulls-in-scalaquery/comment-page-1/#comment-48 Stefan Zeiger Sun, 21 Jun 2009 15:03:44 +0000 http://szeiger.de/?p=27#comment-48 Ah, that's unfortunate. I knew about casting null values to boxed Any values but not about this AnyVal initializer. It's mentioned in this bug report along with similar situations: https://lampsvn.epfl.ch/trac/scala/ticket/1470 Ah, that’s unfortunate. I knew about casting null values to boxed Any values but not about this AnyVal initializer. It’s mentioned in this bug report along with similar situations: https://lampsvn.epfl.ch/trac/scala/ticket/1470

]]> By: Paul Phillips http://szeiger.de/blog/2009/06/20/dealing-with-nulls-in-scalaquery/comment-page-1/#comment-47 Paul Phillips Sun, 21 Jun 2009 03:47:44 +0000 http://szeiger.de/?p=27#comment-47 "Except there is one thing you cannot do with Scala’s value types: They may never be null." scala> class X { var a: AnyVal = _ } defined class X scala> def foo(v: AnyVal) = v.toString foo: (v: AnyVal)java.lang.String scala> foo((new X).a) java.lang.NullPointerException “Except there is one thing you cannot do with Scala’s value types: They may never be null.”

scala> class X { var a: AnyVal = _ }
defined class X

scala> def foo(v: AnyVal) = v.toString
foo: (v: AnyVal)java.lang.String

scala> foo((new X).a)
java.lang.NullPointerException

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