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The Spring container provides a consistent mechanism to configure applications [4]: 122 and integrates with almost all Java environments, from small-scale applications to large enterprise applications. The programmer does not directly create an object, but describes how it should be created, by defining it in the Spring configuration file.
A JAR file allows Java runtimes to efficiently deploy an entire application, including its classes and their associated resources, in a single request. JAR file elements may be compressed, shortening download times. A JAR file may contain a manifest file, that is located at META-INF/MANIFEST.MF. The entries in the manifest file describe how to ...
Modules are a new way of grouping code. Contrary to Jar files, modules explicitly declare which modules they depend on, and what packages they export. [12] Explicit dependency declarations improve the integrity of the code, by making it easier to reason about large applications and the dependencies between software components.
By default, Spring boot provides embedded web servers (such as Tomcat) out-of-the-box. [21] However, Spring Boot can also be deployed as a WAR file on a standalone WildFly application server. [22] If Maven is used as the build tool, there is a wildfly-maven-plugin Maven plugin that allows for automatic deployment of the generated WAR file. [22]
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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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: