[jdk8u-dev] RFR: 8293562: KeepAliveCache Blocks Threads while Closing Connections [v3]

[Dhamoder Nalla]

> Issue: [JDK-8293562](https://bugs.openjdk.org/browse/JDK-8293562): KeepAliveCache Blocks Threads while Closing Connections
> Backport of PR https://github.com/openjdk/jdk11u-dev/pull/1890 fromJDK11 to JDK8.
> 
> The JDK11 patch doesn't apply cleanly 3/11 hunks need to be ported manually in KeepAliveCache.java.
> 
> Test performed:
> 
> 1. JTreg jdk_tier1
> 2. JTreg jdk_tier2
> 3. New test case added to this PR passed with the fix and failed without it.
> 4. The customer failure scenario has been validated.

Dhamoder Nalla has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge pr/437
 - Fix indentation
 - Backport 770c1f65c588f3156f9b70097df752d8059c1038

-------------

Changes: https://git.openjdk.org/jdk8u-dev/pull/409/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=409&range=02
  Stats: 354 lines in 3 files changed: 288 ins; 19 del; 47 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/409.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/409/head:pull/409

PR: https://git.openjdk.org/jdk8u-dev/pull/409