我在MapReduce中创建了一个wordcount示例,并尝试使用以下命令制作jar文件:
hduseros@MT2012018:/usr/local/hadoop$ jar -cvf playground/wordcount.jar -C playground/classes
但是它根本没有运行,并且给我以下结果:
hduseros@MT2012018:/usr/local/hadoop$ jar -cvf playground/wordcount.jar -C playground/classes
Usage: jar {ctxui}[vfm0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ...
Options:
-c create new archive
-t list table of contents for archive
-x extract named (or all) files from archive
-u update existing archive
-v generate verbose output on standard output
-f specify archive file name
-m include manifest information from specified manifest file
-e specify application entry point for stand-alone application
bundled into an executable jar file
-0 store only; use no ZIP compression
-M do not create a manifest file for the entries
-i generate index information for the specified jar files
-C change to the specified directory and include the following file
If any file is a directory then it is processed recursively.
The manifest file name, the archive file name and the entry point name are
specified in the same order as the 'm', 'f' and 'e' flags.
Example 1: to archive two class files into an archive called classes.jar:
jar cvf classes.jar Foo.class Bar.class
Example 2: use an existing manifest file 'mymanifest' and archive all the
files in the foo/ directory into 'classes.jar':
jar cvfm classes.jar mymanifest -C foo/ .
请纠正我错了的地方。我已经设置了类(class)路径。我可以运行已经存在的示例,但无法创建jar文件。
最佳答案
那可能是因为您没有给它提供从中选择文件的位置。试试这个:
jar -cvf playground/wordcount.jar -C playground/classes .
并包含最后一个点(.)
关于java - jar-cvf命令未运行?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/14639869/