Although the promising Java value types are not imminent, I still enjoy nosing around occasionally in the OpenJDK Valhalla-dev mailing list to see how things are progressing and to get an idea of what is to come. Admittedly, there are some discussions that are beyond my understanding, given my limited exposure to the terms used and the low-level specifics of some messages. However, occasionally, there are messages and threads that I understand and find interesting. A recent example of this is the "Empty value type ?" thread.
Rémi Forax starts the thread by asking "Is empty value type targeted for LW1?" The example error message included with that question shows as a LinkageError and a ClassFormatError with the message "Value Types do not support zero instance size yet." The response to this question from Tobias Hartmann says, "No, empty value types are not planned to be supported for LW1."
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