# 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')