Where in OpenJDK repository can I find Hotspot VM source codes?

zengyijie hzzengyijie at corp.netease.com
Fri Jul 28 09:37:26 UTC 2017

Hi Kris,
Thank you very much for detailed explain!
We are running that specific Oracle JVM in production, and encountered a strange native memory leak, so we plan to build a debug JVM from source codes. 
Per your explain, there is no way to get source codes of Oracle HotSpot VM after JDK6u32? How to get a Oracle Hotspot VM with debug symbol?
Thanks a lot,


> 在 2017年7月28日,上午2:44,Krystal Mok <rednaxelafx at gmail.com> 写道:
> Hi Yijie,
> I don't think there is one that exactly matches what you want.
> I wrote a doc [1] long ago about the correspondence of Sun/Oracle JDK 6 versus OpenJDK 6 in terms of the JVM used. Unfortunately, because of the history behind OpenJDK 6 (it's a backport of OpenJDK 7 to be a JDK6 release, rather than the open sourced version of Sun/Oracle JDK 6), there was no exact correspondence to begin with.
> Back then, the HotSpot Expression release model was still in place, so the Oracle JDK 6 and the then still-in-development JDK 7 would mostly share the same JVM, that's how the OpenJDK 6 HotSpot VM still very closely match the Oracle JDK 6 version -- less some proprietary features like UseCompressedStrings, and a bit of delay in releasing the new tiered compilation features, etc.
> After Oracle JDK6u32 or something, I don't think the OpenJDK 6 HotSpot VM reflected changes to the Oracle JDK 6 any more, as JDK6 was going towards EOL'd and less changes from Oracle JDK 6 were sync'd to OpenJDK 6.
> Red Hat later took over the maintenance of the OpenJDK 6 release, and it further diverged from the Oracle internal one.
> What's in Oracle JDK6u45 specifically that you wanted to check the sources for, though?
> - Kris
> [1]: https://gist.github.com/rednaxelafx/925323 <https://gist.github.com/rednaxelafx/925323>
> On Wed, Jul 5, 2017 at 2:18 AM, zengyijie <hzzengyijie at corp.netease.com <mailto:hzzengyijie at corp.netease.com>> wrote:
> Hi, we are running an outdated Oracle Java JDK6 with Hotspot VM, I have spent quite a while browsing openjdk repository,
> but I can’t find the source codes for the specific Hotspot VM version. The repository tip of http://hg.openjdk.java.net/jdk6/jdk6/hotspot/ <http://hg.openjdk.java.net/jdk6/jdk6/hotspot/> <http://hg.openjdk.java.net/jdk6/jdk6/hotspot/ <http://hg.openjdk.java.net/jdk6/jdk6/hotspot/>> is only jdk6-b43, there’s no 1.6.0_45.
> Could someone help tell where to find it?
> The Oracle JDK version is as follows:
> java version "1.6.0_45"
> Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
> Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)

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