Java / JDK, JRE, JVM, JIT
Difference between EAR, JAR and WAR file in J2EE.
J2EE defines three types of archives.
- Java Archive (JAR) A JAR file encapsulates one or more Java classes, a manifest, and a descriptor. JAR files are the lowest level of archive. JAR files are used in J2EE for packaging EJBs and client-side Java Applications.
- Web Archive (WAR) A WAR files are similar to JAR files, except that they are specifically for web applications made from Servlets, JSPs, and supporting classes. Struts and Spring based Web applications may be archived to a WAR.
- Enterprise Archive (EAR) An EAR file contains all of the components that make up a particular J2EE application. A EAR may contain one or more WAR files. EAR files can also contain connector modules packaged as RAR files and Client modules packaged as JAR files.
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