unpack200 Man page

unpack200 Java Deployment Tools unpack200


unpack200 – Transforms a packed file produced by pack200 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 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.


The unpack200 command is a native implementation that transforms a
packed file produced by pack200 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


-Hvalue –deflate-hint=value
Sets the deflation to be true, false, or keep on all entries
within a JAR file. The default mode is keep. If the value is
true or false, then the –deflate=hint option overrides the
default behavior and sets the deflation mode on all entries
within the output JAR file.

-r –remove-pack-file
Removes the input pack file.

-v –verbose
Displays minimal messages. Multiple specifications of this
option displays more verbose messages.

-q –quiet
Specifies quiet operation with no messages.

-lfilename –log-file=filename
Specifies a log file where output messages are logged.

-? -h –help
Prints help information about the unpack200 command.

-V –version
Prints version information about the unpack200 command.

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 java.

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.


· pack200

· jar

· jarsigner

· Pack200 and Compression at

· The Java SE Technical Documentation page at

JDK 8 21 November 2013 unpack200