Re: help with weak references

scala>  System.gc()

scala> val x = wr.wr.get
x: Option[List[Int]] = Some(List(0, 1, 2, 3, 4))  // <<------ should have 
been None


Have you been able to observe the behaviour you're expecting with 
equivalent Java code? I'm asking because, from what I can see, the 
System.gc documentation [1] doesn't make any guarantees that weak 
references will be collected - or, at least, that they will have been 
collected when the call returns.

If you wait a while longer or add a loop to create "more garbage", does the 
behaviour change?

Regards

ap

[1] https://docs.oracle.com/javase/8/docs/api/java/lang/System.html#gc--

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