Re: [Springframework-developer] Re: CGLIB memory usage within class loader

[<tho...@tr...>]

Rob,

Don't know if you've seen this, but there is a free version of JProbe available
for download.  It's limited to 5 users, and you have to download a new version
when it expires in six months.  Good enough for home use :)

http://www.quest.com/jprobe/profiler_freeware.asp

Thomas


Quoting Rob Harrop <ro...@ca...>:

> To add to what Chris is saying, the best way to keep memory usage is to
> implement equals() on your interceptors so that proxy classes can be
> reused as much as possible. I am going to look into a solution that will
> use weak references from the proxy class but strong references from
> proxy instances. This way once a proxy class is no longer used the
> advice chain and target can still be GCd. In the rare case when the
> advice chain is collected but the proxy class could still apply we can
> instruct CGLIB to create a new proxy class anyway - this will
> effectively remove this problem in all but the MOST extreme cases.
>
> I will work on this as soon as I get back to work. I need access to a
> profiler to make this solution work properly and I don't have one at home.
>
> Rob
>
> Chris Nokleberg wrote:
>
> >Rob Rudin wrote:
> >
> >
> >>Is there any chance that this will eventually be fixed in CGLIB?
> >>We can get by with one context for all test methods, but as you
> >>state, it would be nice for it not to be a problem when each
> >>test method does need to create its own context.
> >>
> >>
> >
> >CGLIB keeps an internal WeakReference-based per-ClassLoader cache of all
> >generated classes, and tries to use it whenever possible. But if anything
> >about the requested proxy changes, it does the safe thing and generates a
> >new class. As Rob Harrop alluded to, for CGLIB to realize that one proxy is
> >the same as another, among other things the Callback and CallbackFilter
> >objects must implement equals/hashCode properly. Hibernate may have some
> >issues in this regard, so you may want to file a bug with them.
> >
> >Chris
> >
> >
> >
> >
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