d or -describe-module Prints the module descriptor or automatic module name. x or -extract Extracts the named (or all) files from the archive. u or -update Updates an existing JAR file. t or -list Lists the table of contents for the archive. i= FILE or -generate-index= FILE Generates index information for the specified JAR file.

Generally the operation argument is the first argument specified on the command line. You can mix an operation argument with other one-letter options. You specify the operation mode for the jar command by including the appropriate operation arguments described in this section. When using the jar command, you must specify the operation for it to perform. The following operations described in Operation Modifiers Valid Only in Create and Update Modes are valid only when creating or updating a modular jar or updating an existing non-modular jar:Īll mandatory or optional arguments for long options are also mandatory or optional for any corresponding short options. A JAR file can be used as a class path entry, whether or not it's compressed.Īn archive becomes a modular JAR when you include a module descriptor, module-info.class, in the root of the given directories or in the root of the. The jar command also enables individual entries in a file to be signed so that their origin can be authenticated. The jar command also compresses files, which further improves download time. This dramatically improves download times. When modules or the components of an application (files, images and sounds) are combined into a single archive, they can be downloaded by a Java agent (such as a browser) in a single HTTP transaction, rather than requiring a new connection for each piece. Other arguments are either options that modify the behavior of the operation or are required to perform the operation. It has several main operation modes, defined by one of the mandatory operation arguments. The syntax for the jar command resembles the syntax for the tar command. For transportation and deployment, it's usually more convenient to package modules as modular JARs.

Initially, the jar command was designed to package Java applets (not supported since JDK 11) or applications however, beginning with JDK 9, users can use the jar command to create modular JARs. The jar command is a general-purpose archiving and compression tool, based on the ZIP and ZLIB compression formats. Jar - create an archive for classes and resources, and manipulate or restore individual classes or resources from an archive Synopsis Operation Modifiers Valid Only in Create, Update, and Generate-index Modes.Operation Modifiers Valid Only in Create and Update Modes.

Long path tool .jar java