加载rJava库时“无法加载共享对象”

Question

I apologize in advance for my bad english, i hope that someone can help me. I have to load an Excel file .xlsx on R, but:

library(xlsx)

Error: package or namespace load failed for 'rJava': .onLoad failed in loadNamespace() for 'rJava', details: call: inDL(x, as.logical(local), as.logical(now), ...) error: unable to load shared object 'C:/Users/danil/Documents/R/win-library/3.4/rJava/libs/x64/rJava.dll': LoadLibrary failure: Impossibile trovare il modulo specificato. Error: package 'rJava' could not be loaded

So, i tried to install Java, Java SE-Development Kit 10 and Java Runtime Environment 10, 64 bit for both. But, also in this case:

library(rJava)

Error: package or namespace load failed for 'rJava': .onLoad failed in loadNamespace() for 'rJava', details: call: inDL(x, as.logical(local), as.logical(now), ...) error: unable to load shared object 'C:/Users/danil/Documents/R/win-library/3.4/rJava/libs/x64/rJava.dll': LoadLibrary failure: Impossibile trovare il modulo specificato.

What can i do?

Answer 1

This was happening to me as well (also Windows 10), and the problem with mine was that the environment variable was not set properly. In my case, I had to do

Sys.setenv('JAVA_HOME' = 'C:/Program Files (x86)/Java/jre1.8.0_161/')

Just change the folder name to where Java lives in your computer, and let me know if this doesn't work out.

Answer 2

In Ubuntu 16.04 I did the following trick in RStudio:

Sys.setenv('JAVA_HOME' = '/usr/lib/jvm/java-8-oracle/jre')

Surprisingly, but

Sys.setenv('JAVA_HOME' = '/usr/lib/jvm/java-8-oracle/')

didn't work for me.