在 R 中读取 XLSX 文件时出错

Question

I'm trying to read an 1 MB XLSX file stored on a network drive using the lines

options(java.parameters="-Xmx4g")
library(rJava) 
library(xlsx) 
jgc <- function() {
  gc()
  .jcall("java/lang/System", method = "gc")
}    
jgc()
folder <- 'network_drive/State_Stuff/'  
state <- 'MI'
xlsx_in<- read.xlsx2(paste(folder, state,"_data.xlsx", sep = ""),
                  sheetName = "sheet1",
                  colClasses = c(rep("numeric",8), "character"))

And I get the following error.

Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl, : org.apache.poi.POIXMLException: java.lang.reflect.InvocationTargetException

I'm running the Windows7 64-bit RStudio, and running java -version returns

java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

I've tried copy/pasting the file onto my desktop from the network drive and reading that, but that throws the same error.

However, moving the file to my desktop, and using Save-As, and saving it as a new file allows me to read it just fine.

Does anyone have an idea on what's going on here?

Answer 1

Try using the readxl package. It doesn't depend on java.

So for example:

library(readxl) 

folder <- 'network_drive/State_Stuff/'  
state <- 'MI'
xlsx_in<- read_excel(paste(folder, state,"_data.xlsx"),
                  sheet = "sheet1",
                  col_types = c(rep("numeric",8), "text"))

Answer 2

I had the same issue today with a file I received from a colleague and came across this post while searching for a solution. Switching to a different library is not really a solution, and if you are used to xlsx, readxl has unexpected behaviors.

I was able to solve the problem by opening the file in Excel and resaving it. Not sure if the issue is produced by a particular version of Excel or anything else. I can read similar files from the same colleague just fine.

Answer 3

Used gc() (Garbage Collection) and it works.

https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/gc