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What is the necessity of rt.jar ??
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What is rt. jar used for? rt. jar contains all of the compiled class files for the base Java Runtime environment, as well as the bootstrap classes, which are the run time classes that comprise the Java platform core API.
2 Answers. Show activity on this post. The rt. jar file was removed in Java 9, but if you need to access the classfiles in the runtime, you can do so easily through the JRT file system.
jar and tools. jar in JDK 9. Class and resource files previously stored in lib/rt. jar , lib/tools.
Almost all of JCL is stored in a single Java archive file called "rt. jar" which is provided with JRE and JDK distributions.
It contains all the classes provided in the Java Runtime Environment.
If you don't have it on your classpath you will not have access to any of those classes you need to use like java.lang.String or java.io.File.
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