GNU Classpath is an attempt to create a Free software implementation of the standard class library for Java programming language. It is a part of the Free Software Foundation s GNU project. Despite the massive size of the library to be replicated, the majority of the task is done aside from a portable Swing (Java) implementation.

GNU Classpath is used by many Free Software Java Virtual Machine projects (like Kaffe, SableVM, and GCJ) because every full-featured Java Virtual Machine must provide an implementation of the standard class libraries.

GNU Classpath is licensed under the GPL with GPL linking exception.

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