On Mon, Nov 11, 2013 at 6:20 PM, Simon Urbanek
<[email protected]> wrote:
>
> It’s a limitation of the Java runtime - you cannot fork a JVM. This is true
> for most libraries that use long-lived threads or any kind if UI (see the
> warnings in mcfork).
Is there some way to reset or restart the JVM within the fork? For
example, the following code seems to work in the terminal on mac/linux
(not in macgui):
library(rJava)
library(parallel)
myfile <- system.file("tests", "test_import.xlsx", package = "xlsx")
mccollect(mcparallel({xlsx::read.xlsx(myfile, 1)}))
But if we load the 'xlsxjars' package in the parent process, the
example does not work anymore as Simon explained:
library(xlsxjars)
mccollect(mcparallel({xlsx::read.xlsx(myfile, 1)}))
Would there be a way to work around this by manually forcing a reset
of the JVM in the child process, in order to get the similar behavior
as if the 'xlsxjars' package was not loaded in the parent process? I
tried unloading 'xlsxjars' with ?detach, but that seems to make things
worse.
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