JDK-8218997 : Xusage text, man help, etc doesn't mention -Xlog option.
  • Type: Bug
  • Component: tools
  • Sub-Component: launcher
  • Affected Version: 9,10,11,12,13
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-02-14
  • Updated: 2019-05-28
  • Resolved: 2019-05-22
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JDK 13
13 b22Fixed
Related Reports
Relates :  
JDK-8046148 - JEP 158: Unified JVM Logging
Description
Running "java -X" does not list the -Xlog option. The source files Xusage.txt, java.1, and launcher.properties are all missing this major option.

Describing -Xlog succinctly is tricky, but leaving a trail of breadcrumbs to -Xlog:help would be a huge clue.
Comments
The "man" page I'm referring to is still missing -Xlog: src/java.base/share/man/java.1 e.g. http://hg.openjdk.java.net/jdk/jdk/file/181986c54764/src/java.base/share/man/java.1 I think this is the basis of the man pages installed on linux? Sorry about false alarm on Xusage.txt, either was looking at old version or just missed it.
22-05-2019
The online man page also have documented -Xlog option, https://docs.oracle.com/en/java/javase/12/tools/java.html#GUID-3B1CE181-CD30-4178-9602-230B800D4FAE
22-05-2019
Xusage.txt does document Xlog: -Xlog:<opts> control JVM logging, use -Xlog:help for details
22-05-2019