when an instance of the JVM is instantiated?

Question

I have a java class that contains an instruction to do something in a hosting platform.

java Foo.class

I believe that an instance of the JVM is created/instantiated after running "java" command. Did I understand it right? "java" command is an independent program or a process, but an instantiated JVM is another process...

The `java` binary is the JVM. That is, unless your path is set up strangely, and it's actually pointing to some other script/binary. — Andy Turner, Mar 18 '15 at 14:44
See http://stackoverflow.com/a/26025656/3448419 for the details. — apangin, Mar 18 '15 at 16:28

Evgeniy Dorofeev · Accepted Answer · 2015-03-18T15:41:38.500

2

java (java.exe in Windows) is an application, it is a wrapper over jvm library (jvm.dll in Windows). We can say java.exe is a JVM launcher.

edited Mar 18 '15 at 15:41

answered Mar 18 '15 at 14:46

Evgeniy Dorofeev

133,369
30
199
275

score 1 · Answer 2 · answered Mar 18 '15 at 14:45

The term "java command" is a little misleading. What you're launching is a program or application. In unix/linux that's a binary with the execute bit set, in windows it's a file with an *.exe extension, in OSX it could be a binary or an *.app

In all those cases what's happening is the OS launches a process called "java" that is the JVM.

when an instance of the JVM is instantiated?

2 Answers2