ParentProcessWatcher is not working properly on macOS

[testforstephen]

OS: macOS Catalina
vscode-java: 1.6.0

Open a Java project in VS Code, wait for the projects to be imported, and then click x button to close VS Code Window. Java extension is supposed to detect parent process exit and shutdown itself. Actually the log shows the ParentProcessWatcher didn't work.

!ENTRY org.eclipse.jdt.ls.core 4 0 2022-05-31 21:04:11.286
!MESSAGE Cannot run program "kill": error=316, posix_spawn failed
!STACK 0
java.io.IOException: Cannot run program "kill": error=316, posix_spawn failed
	at java.base/java.lang.ProcessBuilder.start(Unknown Source)
	at java.base/java.lang.ProcessBuilder.start(Unknown Source)
	at java.base/java.lang.Runtime.exec(Unknown Source)
	at java.base/java.lang.Runtime.exec(Unknown Source)
	at java.base/java.lang.Runtime.exec(Unknown Source)
	at org.eclipse.jdt.ls.core.internal.ParentProcessWatcher.parentProcessStillRunning(ParentProcessWatcher.java:77)
	at org.eclipse.jdt.ls.core.internal.ParentProcessWatcher.run(ParentProcessWatcher.java:49)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.runAndReset(Unknown Source)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: error=316, posix_spawn failed
	at java.base/java.lang.ProcessImpl.forkAndExec(Native Method)
	at java.base/java.lang.ProcessImpl.<init>(Unknown Source)
	at java.base/java.lang.ProcessImpl.start(Unknown Source)
	... 13 more

[testforstephen]

An alternative approach is to use JDK ProcessHandle API. It supports getting a ProcessHandle from a pid, and listening at its exit event via ProcessHandle.onExit().