Without this file, the Java Virtual Machine (JVM) cannot recognize even the most basic commands. 2. Where to Download rt.jar
: In older versions (pre-Java 7), it was named classes.jar . In newer installs of Java 8, it follows the standard path. 4. Why is rt.jar Missing? (Java 9 and Later) md rt.jar download
You should from third-party websites. Because it is a "trusted" file loaded by the bootstrap class loader without standard security checks, a corrupted or malicious version could compromise your entire system. Without this file, the Java Virtual Machine (JVM)
If you already have Java 8 installed, you don't need to download anything. You can find the file in the following directory: : $JAVA_HOME/jre/lib/rt.jar . In newer installs of Java 8, it follows the standard path
: Applications will run normally; the JVM knows where the classes are.
To get a legitimate rt.jar , you must install the or Java Runtime Environment (JRE) version 8 or earlier.
If you are using , you will notice that rt.jar is missing. This is intentional.Starting with Project Jigsaw (JEP 220) , Java moved to a modular system. The monolithic rt.jar was replaced by several .jmod files or a single internal modules image to improve performance and reduce the footprint of the runtime.