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8357179: Deprecate VFORK launch mechanism from Process implementation (linux) #25282

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tstuefe wants to merge 2 commits into from
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8357179: Deprecate VFORK launch mechanism from Process implementation (linux) #25282

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8bd4a36
deprecate-vfork
tstuefe May 17, 2025
ec3197f
use string block
tstuefe May 19, 2025
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18 changes: 14 additions & 4 deletions src/java.base/unix/classes/java/lang/ProcessImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -100,16 +100,26 @@ private static LaunchMechanism launchMechanism() {
// Should be value of a LaunchMechanism enum
LaunchMechanism lm = LaunchMechanism.valueOf(s.toUpperCase(Locale.ROOT));
switch (OperatingSystem.current()) {
case LINUX:
return lm; // All options are valid for Linux
case LINUX: {
// All options are valid for Linux, but VFORK is deprecated and results
// in a warning
if (lm == LaunchMechanism.VFORK) {
System.err.println("VFORK MODE DEPRECATED");
System.err.println("""
The VFORK launch mechanism has been deprecated for being dangerous.
It will be removed in a future java version. Either remove the
jdk.lang.Process.launchMechanism property (preferred) or use FORK mode
instead (-Djdk.lang.Process.launchMechanism=FORK).
""");
}
return lm;
}
case AIX:
case MACOS:
if (lm != LaunchMechanism.VFORK) {
return lm; // All but VFORK are valid
}
break;
case WINDOWS:
// fall through to throw to Error
}
} catch (IllegalArgumentException e) {
}
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