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8273853: Update the Java manpage for automatic CDS archive updating

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Reviewed-by: ccheung, dholmes
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Ioi Lam 2022-06-07 16:57:32 +00:00
parent 41d5809caf
commit c41a283f52
1 changed files with 39 additions and 3 deletions
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42
src/java.base/share/man/java.1
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@ -5374,9 +5374,9 @@ Therefore, you can omit the \f[CB]<static_archive>\f[R] by saying only:
.PP
\f[CB]\-XX:SharedArchiveFile=<dynamic_archive>\f[R]
.RE
.SS Creating CDS Archives
.SS Manually Creating CDS Archives
.PP
CDS archives can be created with several methods:
CDS archives can be created manually using several methods:
.IP \[bu] 2
\f[CB]\-Xshare:dump\f[R]
.IP \[bu] 2
@ -5438,7 +5438,7 @@ The output of this command should contain the following text:
\f[CB][info][class,load]\ test.Hello\ source:\ shared\ objects\ file\f[R]
.RE
.RE
.SS Creating a Dynamic CDS Archive File with \-XX:SharedArchiveFile
.SS Creating a Dynamic CDS Archive File with \-XX:ArchiveClassesAtExit
.PP
Advantages of dynamic CDS archives are:
.IP \[bu] 2
@ -5533,6 +5533,42 @@ application start\-up script with the same technique:
.PP
\f[CB]env\ JAVA_TOOL_OPTIONS=\-XX:+RecordDynamicDumpInfo\ bash\ app_start.sh\f[R]
.RE
.SS Creating Dynamic CDS Archive File with \-XX:+AutoCreateSharedArchive
.PP
\f[CB]\-XX:+AutoCreateSharedArchive\f[R] is a more convenient way of
creating/using CDS archives.
Unlike the methods of manual CDS archive creation described in the
previous section, with \f[CB]\-XX:+AutoCreateSharedArchive\f[R], it\[aq]s
no longer necessary to have a separate trial run.
Instead, you can always run the application with the same command\-line
and enjoy the benefits of CDS automatically.
.RS
.PP
\f[CB]java\ \-XX:+AutoCreateSharedArchive\ \-XX:SharedArchiveFile=hello.jsa\ \-cp\ hello.jar\ Hello\f[R]
.RE
.PP
If the specified archive file exists and was created by the same version
of the JDK, then it will be loaded as a dynamic archive; otherwise it is
ignored at VM startup.
.PP
At VM exit, if the specified archive file does not exist, it will be
created.
If it exists but was created with a different (but post JDK 19) version
of the JDK, then it will be replaced.
In both cases the archive will be ready to be loaded the next time the
JVM is launched with the same command line.
.PP
If the specified archive file exists but was created by a JDK version
prior to JDK 19, then it will be ignored: neither loaded at startup, nor
replaced at exit.
.PP
Developers should note that the contents of the CDS archive file are
specific to each build of the JDK.
Therefore, if you switch to a different JDK build,
\f[CB]\-XX:+AutoCreateSharedArchive\f[R] will automatically recreate the
archive to match the JDK.
If you intend to use this feature with an existing archive, you should
make sure that the archive is created by at least version 19 of the JDK.
.SS Restrictions on Class Path and Module Path
.IP \[bu] 2
Neither the class path (\f[CB]\-classpath\f[R] and