Installed extensions are JAR files in the lib/ext directory of the Java Runtime Environment (JRE™) software. As its name implies, the JRE is the runtime portion of the Java Development Kit containing the platform’s core API but without development tools such as compilers and debuggers.

Where is the JRE lib ext folder?

For Windows, the JDK extension directory is located at ” <JAVA_HOME>\jre\lib\ext “ (e.g., ” c:\Program Files\Java\jdk1. 8.0_xx\jre\lib\ext “). For Mac, the JDK extension directories are ” /Library/Java/Extensions ” and ” /System/Library/Java/Extensions “.

What is a JRE file?

The Java Runtime Environment, or JRE, is a software layer that runs on top of a computer’s operating system software and provides the class libraries and other resources that a specific Java program needs to run. The JRE is one of three interrelated components for developing and running Java programs.