Users should not be using the -XX:+UseSharedSpace, -XX:+RequireSharedSpaces, and -XX:+DumpSharedSpaces options. Instead, they should use the options -Xshare:off, -Xshare:auto, -Xshare:on, and -Xshare:dump, which are documented in https://docs.oracle.com/en/java/javase/17/vm/class-data-sharing.html

The -XX:+DynamicDumpSharedSpaces is useless because it is always overridden by the command line processing in Arguments::finalize_vm_init_args(). The feature related to the DynamicDumpSharedSpaces should be accessed using the -XX:ArchiveClassesAtExit option.

https://github.com/openjdk/jdk/blob/44047f849fad157dac5df788aa5a2c1838e4aaf7/src/hotspot/share/runtime/arguments.cpp#L3134


  if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
    FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
  } else {
    FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, true);
  }

These flags should be deprecated and eventually removed.