[jdk8u-dev] RFR: 8293562: KeepAliveCache Blocks Threads while Closing Connections [v2]

[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:
> 
> JTreg jdk_tier1
> JTreg jdk_tier2
> New test case added to this PR passed with the fix and failed without it.

Dhamoder Nalla has updated the pull request incrementally with one additional commit since the last revision:

  Fix indentation

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/409/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/409/files/0d51b250..7d73c521

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=409&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=409&range=00-01

  Stats: 63 lines in 1 file changed: 13 ins; 13 del; 37 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