OpenJDK vs Sun JDK Versions

[Erik Trimble]

OpenJDK version numbering seems to be disjoint from Sun JDK numbering.

Here on my Ubuntu 8.04 32-bit machine (openjdk-6-jre-6b11-2ubuntu2.1) ,
I get this:

% java -version
java version "1.6.0_0"
OpenJDK  Runtime Environment (build 1.6.0_0-b11)
OpenJDK Client VM (build 1.6.0_0-b11, mixed mode, sharing)


In theory, the second line (the VM version string), should report the
current contents shown in
http://hg.openjdk.java.net/jdk6/jdk6/hotspot/make/hotspot_version

which _should_ show "build 11.0-b17", as the current OpenJDK-6 Hotspot
VM source is based on Hotspot 11 Build 17.


I suspect the packagers have provided their own version numbering; how
they've chosen what number to use is unknown to me.


I can't remember which drop of the JDK 6 Update series was the basis for
OpenJDK-6.  I _know_ it is at least Update 5, but I can't be certain
which. Also, there have considerable incremental updates included, so a
direct mapping of the OpenJDK6 to Sun JDK 6 Update projects isn't really
possible NOW.


As is being discussed here on this list, the synchronization of OpenJDK6
and the Sun JDK 6 Update trains is moving forward: that is, they shortly
_may_ be virtually identical, in that Sun is looking to move the 6
Update development out in the open, in the same way that the Sun JDK 7
vs. OpenJDK 7 development is done now.


Note that I _DO_NOT_ speak for Sun on this issue, and people should NOT
take what I just said as any commitment or statement of intent on Sun's
part.  That information is forthcoming in various Official Statements.
I'm just the Hotspot VM Gatekeeper.


-Erik

 



On Mon, 2009-05-11 at 14:33 -0700, Keith Kowalczykowski wrote:
> Hi Everyone,
> 
>     I'm a little bit confused about the version numbering of openjdk 6 vs
> the current JDK provided by Sun. Looking at an install of openjdk from
> debian (lenny), it lists itself as:
> 
> java version "1.6.0_0"
> OpenJDK  Runtime Environment (build 1.6.0_0-b11)
> 
> Now, if I'm reading this correctly, this is essentially "update 0" or the
> initial release of the jdk. Therefore, I have two questions:
> 
> 1) Am I reading this correctly? In the sun jdk, the _X would be the update
> number, so I'm assuming this is update 0.
> 
> 2) Assuming I'm reading this correctly, why aren't any of the updates in the
> open JDK? 
> 
> Thanks in advance for you help.
> 
>     -Keith
> 
> 
-- 
Erik Trimble
Java System Support
Mailstop:  usca22-123
Phone:  x17195
Santa Clara, CA
Timezone: US/Pacific (GMT-0800)