Java Virtual Machine Specifications 2.0

Java Virtual Machine Specifications was written as a full document which helps the developing of the Java virtual machine. It is essential for compiler writers who wish to target the Java virtual machine and for programmers who want to implement a compatible Java virtual machine. It is also a definitive source for anyone who wants to know exactly how the Java programming language is implemented.
The Java virtual machine is an abstract machine. References to the Java virtual machine throughout this specification refer to this abstract machine rather than to Suns or any other specific implementation. This book serves as documentation for a concrete implementation of the Java virtual machine only as a blueprint documents a house. An implementation of the Java virtual machine (known as a runtime interpreter) must embody this specification, but is constrained by it only where absolutely necessary.