If to use OpenJDK before 19 - log messages of non-ASCII symbols are OK.
But if to use 19:
WARNING: package com.sun.javafx.embed.swing.oldimpl not in javafx.swing
Waiting for debugger to connect...
Program started.
BlueCove version 2.1.1-SNAPSHOT on winsock
Call B4XPages.GetManager.LogEvents = True to enable logging B4XPages events.
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At this point the officially supported Java versions are OpenJDK 14, 11 or Oracle Java 8. I don't think that you will gain anything (right now) from using a different version.