A certain (type of?) callsite seems to always require relinking

Hannes Wallnoefer hannes.wallnoefer at oracle.com
Wed Nov 19 10:06:55 UTC 2014

Hi Benjamin,

Thanks for the report. There is indeed something going wrong here. 
Ideally, an app would not (or only occasionally) relink once it has 

I think we should be able to reproduce the problem from your 
description: method in abstract class, about a dozen subclasses none of 
which overwrites the original method.

One question: How is the script evaluated? Does all this take place 
within a single script engine eval()? Or are you repeatedly 
evaluating/calling into the script engine?


Am 2014-11-19 um 10:40 schrieb Benjamin Sieffert:
> Hello everyone,
> it started with a peculiar obversion about our nashorn-utilising
> application, that I made: It continues to load around a hundred new
> anonymous classes *per second*, even without new scripts being introduced –
> i.e. we are just running the same javascripts over and over again, with
> different arguments.
> So I ran the application with -tcs=miss and from what I see, eventually
> there will be only a single call left that is producing all the output and
> therefor, I believe, all the memory load. (Am I correct in this assumption?)
> What I can say about the call is the following:
> - return type is an array of differing length (but always of the same type)
> - there are two arguments, of which the first one will always exactly match
> the declaration, the second one is a subclass of the one used in the
> declaration – but always the same subclass
> - method is implemented in an abstract class
> - receiver is one of about a dozen classes that inherit from this abstract
> class
> - none of the receivers overwrite the original implementation or overload
> the method
> When I look into the trace output, there's often a bunch of
> "TAG MISS library:212 dyn:getMethod|getProp|getElem:<methodname> …"
> in a row, then a whole lot of
> "TAG MISS library:212
> dyn:call([jdk.internal.dynalink.beans.SimpleDynamicMethod …"
> with a bit of the first one inbetween.
> Is this a known issue? Is there something I can do to alleviate the
> problem? As it is, I might just end up implementing the whole chunk in Java
> and be done with it, but I thought this might be worthy of some discussion.
> If there's some important information that I have left out, I'll be glad to
> follow up with it.
> Regards,
> Benjamin

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