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why need different jvm implementation?

kumar Reddy

Joined: Nov 24, 2004
Posts: 29
i have a small question

j2sdk1.4 comes with a default implementation of jvm?

but there exists many implemntations of jvm from different vendors such as IBM J9 VM?

i would just like to know why is it like this..why dont we use the default vm provided by sun?

when should we use the JVM'S from other vendors?

thank you
Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24166

Given that there is Windows, why do we need other OSs?

Given the ix86 architecture, why do we need PowerPC or Sparc?

Given that Ford makes the Escort, why do we need Kia or Lexus or Hummer?

Pepsi, Pepsi, no Coke!

[Jess in Action][AskingGoodQuestions]
Jeroen Wenting
Ranch Hand

Joined: Oct 12, 2000
Posts: 5093
Originally posted by Ernest Friedman-Hill:

Given that Ford makes the Escort, why do we need Kia or Lexus or Hummer?

I've often wondered about that, especially Kia and Lexus


Manufacturers make JVMs optimised for their specific needs and desires.
Someone might want one that has a smaller memory footprint and doesn't need some things the default one has.
Another might want more security as standard and is willing to sacrifice performance for that.
Etc. etc.

I agree. Here's the link:
subject: why need different jvm implementation?
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