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Option#orNull can't be used from java #10006

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scabug opened this issue Oct 24, 2016 · 4 comments
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Option#orNull can't be used from java #10006

scabug opened this issue Oct 24, 2016 · 4 comments
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@scabug
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scabug commented Oct 24, 2016

Scala options are a pain to use in java, but they would be much more pleasant if you could orNull them. As it is today, they blow up with things like:

error] class AllOf implements RoutePredicate {
                       [error] blahblaaablhablah.java:24: method orNull in class scala.Option<A> cannot be applied to given types;
                       [error]   required: scala.Predef.$less$colon$less<scala.runtime.Null$,A1>
                       [error]   found: no arguments
                       [error]   reason: cannot infer type-variable(s) A1
                       [error]     (actual and formal argument lists differ in length)
                       [error]     String sanitizedPath = opt.orNull();
                       [error] Compile failed at Oct 24, 2016 1:38:55 PM [0.221s]

               compile(blabhlahblahblahbl/predicates:predicates) failed: Zinc compile failed.
@scabug
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scabug commented Oct 24, 2016

Imported From: https://issues.scala-lang.org/browse/SI-10006?orig=1
Reporter: Moses Nakamura (mosesn)

@SethTisue
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it's not clear to me if this is even actionable (I suspect it is not, but I could easily be wrong)

I'm going to close the ticket, but we can reopen if someone can propose a solution plan. otherwise it's too open-ended for scala/bug

@Jasper-M
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Jasper-M commented Mar 1, 2018

scala-java8-compat contains a conversion between Option and Optional. That's really the best you can do here, I think...

@NthPortal
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The purpose of the signature for Option.orNull is to prevent you from attempting to make non-nullable types (e.g. Int) null (I believe). You can still use Option.getOrElse(null) from Java though.

@mosesn mosesn mentioned this issue Jul 11, 2019
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@SethTisue @Jasper-M @NthPortal @scabug