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javademos/docs/output/61-behaviour-changes.txt
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# Behaviour changes that need no new API to observe
=== a script that pins the VFORK process launch mechanism
JDK 26: java -Djdk.lang.Process.launchMechanism=VFORK SpawnProbe
VFORK MODE DEPRECATED
The VFORK launch mechanism has been deprecated for being dangerous.
It will be removed in a future java version. Either remove the
JDK 27: java -Djdk.lang.Process.launchMechanism=VFORK SpawnProbe
The VFORK launch mechanism has been removed. Switching to FORK instead.
Please remove the jdk.lang.Process.launchMechanism property (preferred)
or use FORK mode instead (-Djdk.lang.Process.launchMechanism=FORK).
=== the legacy ISO 639 language codes property (iw, ji, in)
JDK 26: java -Djava.locale.useOldISOCodes=true Compat
java.version = 26.0.2.1
WARNING: The use of the system property "java.locale.useOldISOCodes" is deprecated. It will be removed in a future release of the JDK.
Locale("iw").language = iw (Hebrew; old code 'iw', current code 'he')
JDK 27: java -Djava.locale.useOldISOCodes=true Compat
java.version = 27
WARNING: The system property "java.locale.useOldISOCodes" is no longer supported. Any specified value will be ignored.
Locale("iw").language = he (Hebrew; old code 'iw', current code 'he')