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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]
Manifests may contain additional information; for example, in JAR (a package format for delivering software written in Java programming language), they can specify a version number and an entry point for execution. The manifest may optionally contain a cryptographic hash or checksum of each file. By creating a cryptographic signature for such a ...
java -jar D:\myprogram\helloWorld.jar [app arguments] This automatically starts org.mypackage.HelloWorld specified in class Main-Class with the arguments. The user cannot replace this class name using the invocation java -jar. Class-Path describes the location of supportLib.jar relative to the location of the library helloWorld.jar.
The OSGi Alliance specified (starting as JSR 8 in 1998) a modularity framework that aims to solve JAR hell for current and future VMs in ME, SE, and EE that is widely adopted. Using metadata in the JAR manifest, JAR files (called bundles) are wired on a per-package basis. Bundles can export packages, import packages and keep packages private ...
JAR files are created with the jar command-line utility. The command jar cf myPackage.jar *.class compresses all .class files into the JAR file myPackage.jar. The 'c' option on the command line tells the jar command to "create new archive." The ' f ' option tells it to create a file. The file's name comes next before the contents of the JAR file.
Bundles are normal JAR components with extra manifest headers. Services The services layer connects bundles in a dynamic way by offering a publish-find-bind model for plain old Java interfaces or plain old Java objects (POJOs). Services Registry The application programming interface for management services. Life-Cycle
JAR – jar ZIP file with manifest for use with Java applications. JPG – Joint Photographic Experts Group – Image File; JPEG – Joint Photographic Experts Group – Image File; LAWRENCE – LBR Lawrence Compiler Type file; LBR – LBR Library file; LLSP3 – Lego Spike program file; LQR – LQR LBR Library file compressed by the SQ program.
POJO Java classes may be deployed in .jar files. An Enterprise Java Bean module has a .jar extension, and contains in its own META-INF directory descriptors describing the persistent classes deployed. Deployed entity beans become visible to other components and, if remotely exported, to remote clients.