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• Implementation and configuration

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JCL is almost entirely written in Java, except for the parts that need direct access to the hardware and operating system (such as for I/O or bitmap graphics), which are instead written in C++.cite-ref-1[1] The classes that give access to these functions commonly use Java Native Interface wrappers to access operating system APIs.

Almost all of JCL is stored in a single Java archive file called "rt.jar" which is provided with JRE and JDK distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpathcite-ref-2[2] and does not have to appear in the classpath declared for the application. The runtime uses the bootstrap class loader to find the JCL.

The Java Module System (part of the Java 9 release) broke the monolithic "rt.jar" JAR file and modularized the JCL itself in several modules with specified dependencies.cite-ref-3[3]

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