I just updated a webapp, and something peculiar happened, and I'm wondering if it's normal behaviour. I'm using jetty-9.4.6.v20170531.

In my webapps directory, I have a directory "myapp" and a corresponding "myapp.xml". Since this was a major update, I copied "myapp" to "myapp.old" and then updated the contents of "myapp". When I tried to stop the webapp with"java -jar start.jar --stop", I got this:

java.lang.NullPointerException
        at org.eclipse.jetty.start.Main.stop(Main.java:620)
        at org.eclipse.jetty.start.Main.stop(Main.java:560)
        at org.eclipse.jetty.start.Main.doStop(Main.java:548)
        at org.eclipse.jetty.start.Main.start(Main.java:424)

I killed the webapp by hand and then tried to restart it, but both "myapp" and "myapp.old" started. As soon as I moved "myapp.old" elsewhere, everything went back to normal: I can now stop it using "--stop", and it restarts correctly.

Is it really the expected behaviour?

Thanks,
--
John English

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