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A Java virtual machine (JVM) is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describes what is required in a JVM implementation. Having a specification ensures interoperability of Java programs across different implementations so that program authors using the Java Development Kit (JDK) need not worry about idiosyncrasies of the underlying hardware platform.
Java virtual machine
Designer
Sun Microsystems
Bits
32-bit
Introduced
1994
Version
187.666.5747
Type
Stack and register–register
Endianness
Big
Registers
General purpose
Per-method operand stack (up to 65535 operands) plus per-method local variables (up to 65535)
Overview of a Java virtual machine (JVM) architecture based on The Java Virtual Machine Specification Java SE 7 Edition
The JVM reference implementation is developed by the OpenJDK project as open source code and includes a JIT compiler called HotSpot. The commercially supported Java releases available from Oracle Corporation are based on the OpenJDK runtime. Eclipse OpenJ9 is another open source JVM for OpenJDK.
Contents
JVM specification Edit
The Java virtual machine is an abstract (virtual) computer defined by a specification. The garbage-collection algorithm used and any internal optimization of the Java virtual machine instructions (their translation into machine code) are not specified. The main reason for this omission is to not unnecessarily constrain implementers. Any Java application can be run only inside some concrete implementation of the abstract specification of the Java virtual machine.[1]
Starting with Java Platform, Standard Edition (J2SE) 5.0, changes to the JVM specification have been developed under the Java Community Process as JSR 924.[2] As of 2006, changes to specification to support changes proposed to the class file format (JSR 202)[3] are being done as a maintenance release of JSR 924. The specification for the JVM was published as the blue book,[4] The preface states:
We intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Oracle provides tests that verify the proper operation of implementations of the Java Virtual Machine. L
Java virtual machine
Designer
Sun Microsystems
Bits
32-bit
Introduced
1994
Version
187.666.5747
Type
Stack and register–register
Endianness
Big
Registers
General purpose
Per-method operand stack (up to 65535 operands) plus per-method local variables (up to 65535)
Overview of a Java virtual machine (JVM) architecture based on The Java Virtual Machine Specification Java SE 7 Edition
The JVM reference implementation is developed by the OpenJDK project as open source code and includes a JIT compiler called HotSpot. The commercially supported Java releases available from Oracle Corporation are based on the OpenJDK runtime. Eclipse OpenJ9 is another open source JVM for OpenJDK.
Contents
JVM specification Edit
The Java virtual machine is an abstract (virtual) computer defined by a specification. The garbage-collection algorithm used and any internal optimization of the Java virtual machine instructions (their translation into machine code) are not specified. The main reason for this omission is to not unnecessarily constrain implementers. Any Java application can be run only inside some concrete implementation of the abstract specification of the Java virtual machine.[1]
Starting with Java Platform, Standard Edition (J2SE) 5.0, changes to the JVM specification have been developed under the Java Community Process as JSR 924.[2] As of 2006, changes to specification to support changes proposed to the class file format (JSR 202)[3] are being done as a maintenance release of JSR 924. The specification for the JVM was published as the blue book,[4] The preface states:
We intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Oracle provides tests that verify the proper operation of implementations of the Java Virtual Machine. L
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