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A JAR ("Java archive") file is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution. [4] JAR files are archive files that include a Java-specific manifest file. They are built on the ZIP format and typically have a .jar file extension. [5]
Pack200, specified in JSR 200 [1] (J2SE 1.5), deprecated in JEP 336 [2] (Java SE 11) and removed in JEP 367 (Java SE 14), [3] is a compacting archive format developed by Sun, capable of reducing JAR file sizes by up to a factor of 9, [4] with a factor of 3 to 4 seen in practice.
The virtual machine will only load the class files required for executing the program. [2] The Java run time system does not need to know about files and file systems as this is delegated to the class loader. A software library is a collection of related object code. In the Java language, libraries are typically packaged in JAR files. Libraries ...
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A WAR file may be digitally signed in the same way as a JAR file in order to allow others to determine where the source code came from. There are special files and directories within a WAR file: The /WEB-INF directory in the WAR file contains a file named web.xml which defines the structure of the web application. If the web application is only ...
These files contain Enterprise JavaBeans (EJB) modules or utility classes. Each JAR file usually has its own META-INF directory with deployment descriptors specific to the JAR module. WAR Files: These files contain web modules, including servlets, JSP files, HTML files, and other web resources. Each WAR file typically has the following structure:
Configuration files can be written in XML, JSON, YAML, or properties file format. Three main components can be defined: Loggers, Appenders, and Layouts. Configuring logging via a file has the advantage that logging can be turned on or off without modifying the application that uses Log4j.
Some BlackBerry devices use JAD files for themes, while on some mobile phones without memory cards it is not possible to download any apps. Recent midlets contain a manifest file in the JAR archive. This file contains much of the information stored in the JAD file, rendering it unnecessary in most cases.