Retrieved 2015-11-29. Prior licenses. The Java Class Library (JCL) is a set of dynamically loadable libraries that Java applications can call at run time. The Java Class Library (rt.jar) is located in the default bootstrap classpath, and does not have to appear in the classpath declared for the application. Since the first May 2007 release, Sun, with the help of the community, released as open source or replaced with open source alternatives almost all the encumbered code:. Following their promise to release a fully buildable JDK based almost completely on free and open source code in the first half of 2007, Sun released the complete source code of the Class Library under the GPL on May 8, 2007, except some limited parts that were licensed by Sun from third parties who did not want their code to be released under an open source license. Sun's goal was to replace the parts that remain proprietary and closed source with alternative implementations and make the Class Library completely free and open source. v t e Sun Microsystems (acquired by Oracle Corp, 2010) People Bill Joy Andy Bechtolsheim Scott McNealy Vinod Khosla List of notable employees Hardware Sun-1 Sun-2 Sun-3 Sun386i Sun-4 SPARCstation Netra Ultra Enterprise Sun Blade Sun Fire SPARC Enterprise SPARC JavaStation Sun Ray Sun Modular Datacenter more. current community chat Stack Overflow Meta Stack Overflow Stack Overflow Careers your communities Sign up or log in to customize your list.