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It also contains META-INF, a subdirectory of the content root that stores metadata about the JAR file. This vicious circle impedes adoption of these versions, which is problematic for everyone, and which led to JEP 238 and multi-release JAR files.Ī JAR file contains a content root that stores class and/or resource files in package hierarchies, and which is like a file system's root directory. The aforementioned difficulties create a disincentive for libraries and frameworks to use new features, which in turn creates a disincentive for users to upgrade to new JDK versions.
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However, it can autodetect and automatically activate many Java 8 API features. For example, Spring 4.x doesn't use any Java 8 language features in its own code. Java frameworks and libraries often don't leverage the language or API features that are available in newer Java releases because of the difficulty in expressing conditional platform dependencies (which generally involves using reflection) or in distributing different library artifacts for different platform versions. For example, as of version 4.0, the Spring Framework supports Java 6, 7, and 8. Many third-party Java frameworks and libraries support several versions of the Java platform. This post introduces you to multi-release JAR files. This upgrade makes it easier for third-party libraries and frameworks to use language and API features introduced in newer Java releases. JEP 238: Multi-Release JAR Files extends the JAR file format to allow multiple, Java-release-specific versions of class/resource files to coexist in the same archive.
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