On Wed, 25 Aug 2021 09:31:51 GMT, Vladimir Ivanov <vliva...@openjdk.org> wrote:
> `MethodHandle.asTypeCache` keeps a strong reference to adapted `MethodHandle` > and it can introduce a class loader leak through its `MethodType`. > > Proposed fix introduces a 2-level cache (1 element each) where 1st level can > only contain `MethodHandle`s which are guaranteed to not introduce any > dependencies on new class loaders compared to the original `MethodHandle`. > 2nd level is backed by a `SoftReference` and is used as a backup when the > result of `MethodHandle.asType()` conversion can't populate the higher level > cache. > > The fix is based on [the > work](http://cr.openjdk.java.net/~plevart/jdk9-dev/MethodHandle.asTypeCacheLeak/) > made by Peter Levart @plevart back in 2015. > > Testing: tier1 - tier6 This pull request has now been integrated. Changeset: 21012f2b Author: Vladimir Ivanov <vliva...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/21012f2bbe214955d05f8bc583dcdceb0949b601 Stats: 109 lines in 2 files changed: 88 ins; 3 del; 18 mod 8078641: MethodHandle.asTypeCache can retain classes from unloading Co-authored-by: Peter Levart <plev...@openjdk.org> Co-authored-by: Vladimir Ivanov <vliva...@openjdk.org> Reviewed-by: psandoz, mchung, plevart ------------- PR: https://git.openjdk.java.net/jdk/pull/5246
