On 04/22/2017 10:06 PM, fo...@univ-mlv.fr wrote:

    Or this might work too:

    http://cr.openjdk.java.net/~plevart/jdk9-dev/Path.toFile/webrev.01/


yes, it's better



    A variant of this might be for FileSystems.getDefault() to start
    returning the custom default filesystem as soon as initLevel
    reaches 2 (after module system is initialized). This might allow
    custom default file system to be effective even before the VM is
    fully booted (for custom security manager or system class loader
    or java agent to already take advantage of it). But that probably
    would mean that the custom default filesystem loading logic would
    have to be modified in order to cope with system class loader not
    being setup already - it could use the builtin app class loader
    for locating and loading the classes...

    Do you happen to have a custom default filesystem to try this with?


sure, a dummy one that delegates everything to the builtin
https://gist.github.com/forax/615828b41c33eccda33afdf2eba1db87

Well, it works at least when -Djava.nio.file.spi.DefaultFileSystemProvider=... is specified on the command line. But when the system property is set as 1st thing in main() method, it is already too late. It seems that after boot sequence is finished (VM.isBooted() == true)and before main() method is called, some code needs the FileSystem again, so default file system is already initialized before the main() is executed.

Perhaps there needs to be another initLevel which would be set just before the invocation of the main() method?

Regards, Peter

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