[PATCH] 4851444: Exposing sun.reflect.Reflection#getCallerClass as a public API in Java 8

Mandy Chung mandy.chung at oracle.com
Tue Sep 17 20:53:51 UTC 2013

On 9/17/13 10:32 AM, cowwoc wrote:
> Hi,
>     Has this been any new progress on this thread? 
> http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-September/thread.html#20480

I have sent my feedback a couple weeks ago on this proposed patch but 
haven't heard back from Nick.

You asked at a good time.  I discussed this with John Rose last couple 
days on this topic.  He has been thinking about how to do 
fillInStackTrace performantly and walk the stack with laziness and frame 
filtering.  The current implementation fills the entire stack trace 
while Groovy and Log4j use case filters the frames of some specific 
classes until it reaches the first one not being filtered.

He suggests to consider an API taking a callback shape (e.g. Function, 
Consumer, etc) that Remi Forax suggested at one time that allows the JVM 
to do something.   I will work with John to work out the details and 
determine the interface between VM and library and hash out issues.

I like the callback shape idea and hope to work out a proposal soon.

> I'd like to second Jörn concerns that shipping JDK8 (less than a month 
> to go!) without a fix would be extremely problematic. The performance 
> impact would be huge and the difficulty of introducing a change would 
> be far more difficult than doing it before JDK8 is out.
>     How do we go about moving this forward?

This RFE is target for JDK 8 and my priority to get that in.  I'm well 
aware the impact to Groovy and Log4j and some other existing 
applications that are seeking for a replacement of 


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