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...s into R, but my code is failing at the first step. I setwd into my the directory with the spreadsheets, and, as a test ask for the first one: read.xlsx(file = "Argentina Final.xls", sheetIndex = 1) I promptly get an error message: Error in .jcall(row[[ir]], "Lorg/apache/poi/xssf/usermodel/XSSFCell;", : method getCell with signature (I)Lorg/apache/poi/xssf/usermodel/XSSFCell; not found Anyone have any idea how to fix this issue? Thanks, Andrew Winterman [[alternative HTML version deleted]]

...; and rJava uses the same quite intensively. I used the xlsx R package which depends on rJava to write .xls files and ran into an error. write.xls from this package uses the functions and returns an error depending on the sequence the packages were loaded. Error in .jnew("org/apache/poi/xssf/usermodel/XSSFWorkbook") : java.lang.AbstractMethodError: java.lang.ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class; data.table::J rJava::J I can work around this by loading and unloading packages, but I feel this should be addressed because loading these two packages that bot...

...64-bit) and also updated the java packages (1.6.0_24) and also R (to 2.15). Then I tried to install my packages which i use daily and one of em is the xlsx package. But if I load the package I get the following error: "Error : .onAttach in attachNamespace() Error: .jnew( "org/apache/poi/xssf/usermodel/XSSFWorkbook") " I did seth a path variable to the java folder (where the jvm.dll is). Then I tried to install the XLConnect package (which would not be that difficult to re-write my code to that package), this package loads without problems, but if I try to load a workbook an...