[jdk11u-dev] RFR: 8204161: [TESTBUG] auto failed with the "Applet thread threw exception: java.lang.UnsupportedOperationException" exception

[Goetz Lindenmaier]

Backport for 11.0.15-oracle parity

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Commit messages:
 - Backport c2867d6577d51dceb1030a63709e310868c755c7

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/615/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=615&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8204161
  Stats: 364 lines in 3 files changed: 280 ins; 49 del; 35 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/615.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/615/head:pull/615

PR: https://git.openjdk.java.net/jdk11u-dev/pull/615