1. By:- Sagar Janagonda
Java HotSpot Virtual Machine

2. Contents
 Introduction
 What is a virtual machine?
 The Java programming environment
 JVM implementations
 A basic block diagram of the Java virtual machine
 Significant Features of JVM
 Conclusion

3. Introduction
• HotSpot is a Java virtual machine for desktops and servers,
maintained and distributed by Oracle Corporation.
• The HotSpot Java virtual machine is written in C++.
•HotSpot was first released in April 27, 1999.
•Though many vendors have come up with there own implementations
of JVM,Hotspot is the most popular one and since version 1.3 it is the
Sun’s default JVM.

4. What is a virtual machine??
Meaning of a virtual machine in my own words is :
“ An isolated guest software installation within a normal
host operating system.”
OR
“A software which is installed on a host operating system
and is running in its own sandbox without disturbing the
services of host operating system but using the hardware
resources of the host computer.”

5. The Java programming environment [1]
http://www.artima.com/insidejvm/ed2/introarch2.html

6. JVM implementations
•Sun allows different vendors to come up with there
implementations of JVM .
•HotSpot was developed by Oracle in C++ . So HotSpot
is nothing but a C++ program capable of translating
bytecode to machine language(0’s and 1’s)

7. A basic block diagram of the Java virtual machine
http://www.artima.com/insidejvm/ed2/introarch2.html

8. Significant features of JVM
•Memory model
•Garbage Collection
•HotSpot detection and Method inlining

9. Other JVMs available in the market
•Jrockit by oracle supported by IBM
•Jikes RVM by IBM
•GCJ (GNU Compiler for Java) by GNU

10. Conclusion
•The Java HotSpot VM delivers optimal performance for Java
Applications.
• Delivers advanced optimization, garbage collection, and thread
synchronization capabilities.
•Deliver an extremely reliable, secure, and maintainable environment to
meet the demands of today's enterprise customers.

11. Note
The openJDK in our lab has HotSpot JVM . All the openJDK for fedora
versions have HotSpot as there JVMs

12. References
[1] “The Java Virtual Machine,” 2nd edition by Bill Venners
[2]http://java.sun.com/products/hotspot/docs/whitepaper/Java_HotSp
ot_WP_Final_4_30_01.pdf

13. Thank you!