8 Installed Directory Structure of JDK

The modular runtime image of JDK 11 contains the following folders:


In macOS, the JDK installation path is/Library/Java/JavaVirtualMachines/jdk-interim.update.patch.jdk/Contents/Home.

The root directory of the JDK software installation. This directory also contains Copyright, README, and Release files.


The root directory of the JDK software installation on macOS.


The executable and command-line launchers that are defined by the modules linked to the image.


The .properties, .policy, and other configuration files intended to be edited by developers, deployers, and end users.


The private implementation details of the runtime system. These files are not intended for external use and must not be modified.

The lib directory on macOS or the lib/$ARCH directory on Linux and Solaris contains the runtime system's dynamically linked native libraries.


The compiled module definitions.


The copyright and license files for each module.


The archive that contains the source code for the Java platform.


The C-language header files that support native-code programming with the Java Native Interface and the Java Virtual Machine (JVM) Debugger Interface.


You can install two versions of JDK simultaneously. Update version of JDK does not replace the previous version, however, a new directory is created. For example, you can install JDK 11 and JDK 11.0.1 simultaneously. In the JDK installation location, jdk-11 and jdk-11.0.1 directories get created.