ClassFileTransformer does not apply to anonymous classes

Daniel D. Daugherty daniel.daugherty at
Fri Jan 22 15:15:04 UTC 2016

On 1/22/16 7:29 AM, Alan Bateman wrote:
> On 22/01/2016 14:00, Coleen Phillimore wrote:
>> Can you send the question again?  I didn't see it.  I also mostly 
>> look at JVM code and rarely deal with the Java side.
> The question was asked about ClassFileTransformer which is implemented 
> by the JPLIS agent via the JVM TI CFLH event. So I think the question 
> is really on whether this event can be posted for classes defined via 
> defineAnonymousClass. None of the standard APIs know about HotSpot 
> specific concepts like "host class" but maybe the host class defining 
> loader and PD can be used with this event. I don't know if this has 
> been explored elsewhere already.
> -Alan.

Sounds like defineAnonymousClass() is somehow by-passing the placement
of the CFLH event poster.

I don't see any information here about which JDK version this issue
is being seen with. I suspect JDK8u, but that's just a guess...


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