Creating Some(object) from Java

Question

I need to call from Java a Scala API that has a parameter with signature Option[Activity].

I want to pass Some(this), whose class is a derived class from Activity.

I have tried many things:

new Some<Activity>.apply(this)
Some.apply((Activity)this)
Option.apply((Activity)this)

but I get a compilation error like this:

actual argument Some<Activity> cannot be converted 
to Option<Class<? extends Activity>> by method invocation conversion

What is the right way of passing this?

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It talks about Option[Double], and doesn't have inheritance issues: How to call scala's Option constructors from Java

lmm · Accepted Answer · 2015-01-22 14:55:47Z

1

Are you quite sure your method takes an Option[Activity]? Because that message suggests it's taking an Option[Class[_ <: Activity]]. Please post the Scala code and how you're calling it.

answered Jan 22, 2015 at 14:55

lmm

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1 Comment

david.perez Over a year ago

A stupid error!. The exact Scala signature was: Option[Class[_ <: Activity]]. That explains everything.

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