Nasty-sounding warning at the first use of xlsx

[EmmanuelCharpentier]

I just saw this :

> library(xlsx)
Le chargement a nécessité le package : rJava
Le chargement a nécessité le package : xlsxjars
> D1 <- read.xlsx(file="Données.xlsm", header=FALSE,
+                     sheetName="Info Générale",
+                     rowIndex=3:32, colIndex=1:12,
+                     colClasses=c("numeric", rep("character",2), "character",
+                                  "numeric", rep("logical",6),"character"))
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.poi.util.SAXHelper (file:/usr/local/lib/R/site-library/xlsxjars/java/poi-ooxml-3.10.1-20140818.jar) to method com.sun.org.apache.xerces.internal.util.SecurityManager.setEntityExpansionLimit(int)
WARNING: Please consider reporting this to the maintainers of org.apache.poi.util.SAXHelper
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
>

I haven't the foggiest idea of the meaning of this warning. It seems, though, that the culprit may exist in some XML library you happen to use, not in xlsx itself.

HTH...

[colearendt]

Thanks for the report... that's a menacing one! Very curious

[IrelCM]

Hello,
I'm having the same problem trying to compile my RMD. The compilation stops when I use this function write.xlsx()

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.poi.util.SAXHelper (file:/home/ibpc/R/x86_64-pc-linux-gnu-library/4.4/xlsxjars/java/poi-ooxml-3.10.1-20140818.jar) to method com.sun.org.apache.xerces.internal.util.SecurityManager.setEntityExpansionLimit(int)
WARNING: Please consider reporting this to the maintainers of org.apache.poi.util.SAXHelper
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

Thanks.
Irelka