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In Scala there are 2 representations of double-precision numbers, one is an AnyVal , the other AnyRef . On the JVM they are mapped to the primitive double and the class java.lang.Double respectively. Now what happens on platforms other than the JVM? I can use Scala.Double for the primitive, but how do I specify that I want a reference to the boxed Double without specifying java.lang.Double ? [Context - left to make sense of Thomasz' answer, but not the fundamental issue. I have a Double that I want to inject with Spring into a Wicket component: class MyPanel(id: String) extends Panel(id) { @SpringBean(name="rxAlarmLimitDb") var alarmLimitDb: Double = _ If I specify the type as scala.Double as above, the injector fails, as it can only inject Objects. If I specify java.lang.Double as the type of the field, all is well class MyPanel(id: String) extends Panel(id) { @SpringBean(name="rxAlarmLimitDb") var alarmLimitDb: java.lang.Double = _ But I'm trying to reduce my dependance on falling back on the Java API, so how do I represent the boxed Double without it? ]

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