Since it is not listed as an option at https://wiki.openjdk.java.net/display/zgc/Main I assume it is not supported. Some tests code made me wonder if it is supported?
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As of this moment, it looks like ZGC will support string deduplication as of Java 18 (from the pre-release notes):
Build 11
ZGC supports string deduplication (JDK-8267186) hotspot/gc
The Z Garbage Collector now supports string deduplication (JEP 192).
Paul Wagland
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Per Liden, the ZGC project lead, stated on 2020-04-02:
ZGC doesn't do String deduplication (yet).
Nick Russler
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Is there an issue anywhere for this to be implemented? That is, when I come back and look at this answer in a year, how will I know if this is still valid or not? – Paul Wagland Oct 15 '21 at 22:01
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Ah. I found the issue, and added an answer for that. – Paul Wagland Oct 15 '21 at 22:52