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Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.
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The Java specifications with PhantomReference was recently improved according to the following link :
https://jcp.org/aboutJava/communityprocess/maintenance/jsr337/jsr337-mr4-changes.html
We have recently improved our implementation of Phantom Reference in Java 8.0.7.20. Memory reclamation of Phantom References is more aggressive, aligned with Weak References.
We have discussed with Kevin Grigorenko, and have agreed an option similar to -Xsoftrefthreshold is not required anymore.