RFR: 8300172: java/net/httpclient/MappingResponseSubscriber.java failed with java.net.ConnectException [v2]

[Daniel Fuchs]

> The MappingResponseSubscriber test has been observed failing on windows in our CI due to a ConnectException.
> I am suspecting that some kind of connection limit enforced by the system has been reached.
> We can see from the log that the TCP connection has failed, been retried, and failed again.
> Previous connections to the same server seem to have succeeded.
> 
> Modifying the test to wait after previous clients have been GC'ed before opening the next one could alleviate the situation.

Daniel Fuchs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into MappingResponseSubscriber-8300172
 - Original exception might be lost with try-finally
 - 8300172

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12013/files
  - new: https://git.openjdk.org/jdk/pull/12013/files/1433b632..097e25bd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12013&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12013&range=00-01

  Stats: 4431 lines in 587 files changed: 2414 ins; 519 del; 1498 mod
  Patch: https://git.openjdk.org/jdk/pull/12013.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12013/head:pull/12013

PR: https://git.openjdk.org/jdk/pull/12013