RFR: 4792: Stop using System.out/err.println and e.printStackTrace [v3]

Mon Jul 5 16:54:15 UTC 2021

> replaced by java.util.logging logging

Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:

  add helpful messages

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/272/files
  - new: https://git.openjdk.java.net/jmc/pull/272/files/55892654..d948fa39

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=272&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=272&range=01-02

  Stats: 41 lines in 23 files changed: 2 ins; 5 del; 34 mod
  Patch: https://git.openjdk.java.net/jmc/pull/272.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/272/head:pull/272

PR: https://git.openjdk.java.net/jmc/pull/272