Transforms a packed file produced by
pack200(1) into a JAR file for web deployment.
unpack200 [ options ] input-file JAR-file
The command-line options. See Options.
Name of the input file, which can be a pack200 gzip file or a pack200 file. The input can also be JAR file produced by
pack200(1) with an effort of
0, in which case the contents of the input file are copied to the output JAR file with the Pack200 marker.
Name of the output JAR file.
unpack200 command is a native implementation that transforms a packed file produced by
(1) into a JAR file. A typical usage follows. In the following example, the
myarchive.jar file is produced from
myarchive.pack.gz with the default
unpack200 command settings.
unpack200 myarchive.pack.gz myarchive.jar
Sets the deflation to be
keep on all entries within a JAR file. The default mode is
keep. If the value is
false, then the
--deflate=hint option overrides the default behavior and sets the deflation mode on all entries within the output JAR file.
Removes the input pack file.
Displays minimal messages. Multiple specifications of this option displays more verbose messages.
Specifies quiet operation with no messages.
Specifies a log file where output messages are logged.
Prints help information about the
Prints version information about the
Passes option to the Java Virtual Machine, where
option is one of the options described on the reference page for the Java application launcher. For example,
-J-Xms48m sets the startup memory to 48 MB. See
This command should not be confused with the
unpack command. They are distinctly separate products.
The Java SE API Specification provided with the JDK is the superseding authority in case of discrepancies.
The following exit values are returned: 0 for successful completion, and a value that is greater than 0 when an error occurred.
Compression Formats for Network Deployment at
The Java SE Technical Documentation page at