Virtual Machine Integration
GNU Classpath contains classes from the official java API namespace. Where calls to the native code are necessary or highly desired, this is done from the small number of "VM" classes. The name of such class matches the name of the class, requiring native methods plus the additional VM prefix: VMObject, VMString and so on. VM classes, stored separately from the rest of code, are package private and final. The methods of these classes contain the keyword native, indicating the necessity of the supporting library. Such library is provided by the authors of the Java virtual machine. Hence GNU Classpath can be connected to nearly any Java virtual machine if the sources of such machine are available and can be modified.
Read more about this topic: GNU Classpath
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