我正在遵循{9}中的Java 9 Jigsaw早期访问版本快速入门指南中的步骤
➜ tmp java --version
java 9-ea
Java(TM) SE Runtime Environment (build 9-ea+172)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+172, mixed mode)
从正确的Java 9目录中选取jar命令。
➜ tmp which jar
/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/bin/jar
快速入门指南中的一个步骤是使用--print-module-descriptor选项运行jar命令但是当我尝试时，我收到以下错误消息。
➜ tmp jar --print-module-descriptor --file=mlib/org.astro@1.0.jar
unrecognized option : --print-module-descriptor
Try `jar --help' for more information.
看起来这个选项在最新的早期访问版本中不存在它是删除还是移动到其他地方？下面输出jar --help以供参考
➜ tmp jar --help
Usage: jar [OPTION...] [ [--release VERSION] [-C dir] files] ...
jar creates an archive for classes and resources, and can manipulate or
restore individual classes or resources from an archive.
Examples:
# Create an archive called classes.jar with two class files:
jar --create --file classes.jar Foo.class Bar.class
# Create an archive using an existing manifest, with all the files in foo/:
jar --create --file classes.jar --manifest mymanifest -C foo/ .
# Create a modular jar archive, where the module descriptor is located in
# classes/module-info.class:
jar --create --file foo.jar --main-class com.foo.Main --module-version 1.0
-C foo/ classes resources
# Update an existing non-modular jar to a modular jar:
jar --update --file foo.jar --main-class com.foo.Main --module-version 1.0
-C foo/ module-info.class
# Create a multi-release jar, placing some files in the META-INF/versions/9 directory:
jar --create --file mr.jar -C foo classes --release 9 -C foo9 classes
To shorten or simplify the jar command, you can specify arguments in a separate
text file and pass it to the jar command with the at sign (@) as a prefix.
Examples:
# Read additional options and list of class files from the file classes.list
jar --create --file my.jar @classes.list
Main operation mode:
-c, --create Create the archive
-i, --generate-index=FILE Generate index information for the specified jar
archives
-t, --list List the table of contents for the archive
-u, --update Update an existing jar archive
-x, --extract Extract named (or all) files from the archive
-d, --describe-module Print the module descriptor, or automatic module name
Operation modifiers valid in any mode:
-C DIR Change to the specified directory and include the
following file
-f, --file=FILE The archive file name. When omitted, either stdin or
stdout is used based on the operation
--release VERSION Places all following files in a versioned directory
of the jar (i.e. META-INF/versions/VERSION/)
-v, --verbose Generate verbose output on standard output
Operation modifiers valid only in create and update mode:
-e, --main-class=CLASSNAME The application entry point for stand-alone
applications bundled into a modular, or executable,
jar archive
-m, --manifest=FILE Include the manifest information from the given
manifest file
-M, --no-manifest Do not create a manifest file for the entries
--module-version=VERSION The module version, when creating a modular
jar, or updating a non-modular jar
--hash-modules=PATTERN Compute and record the hashes of modules
matched by the given pattern and that depend upon
directly or indirectly on a modular jar being
created or a non-modular jar being updated
-p, --module-path Location of module dependence for generating
the hash
Operation modifiers valid only in create, update, and generate-index mode:
-0, --no-compress Store only; use no ZIP compression
Other options:
-h, --help[:compat] Give this, or optionally the compatibility, help
--help-extra Give help on extra options
--version Print program version
An archive is a modular jar if a module descriptor, 'module-info.class', is
located in the root of the given directories, or the root of the jar archive
itself. The following operations are only valid when creating a modular jar,
or updating an existing non-modular jar: '--module-version',
'--hash-modules', and '--module-path'.
Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.