"unable to load shared object" when loading the rJava library

Question

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?

Hi @francesco... welcome to SO. I've edited your title to be a bit more informative as a question. — user3603486
– user3603486, Commented Apr 7, 2018 at 19:07
How did you install xlsx package? Or have a look here stackoverflow.com/q/37735108/5784831 — Christoph
– Christoph, Commented Apr 7, 2018 at 19:25
I wasnt'able to install xlsx package... It says "Error: package or namespace load failed for ‘rJava’". I don't know what to do, i'm a newbie of R. — Francesco Totti
– Francesco Totti, Commented Apr 7, 2018 at 20:26
What is your OS? Usually, when I get these errors, I look all over the error messages, such often there will be some libraries/packages suggested for installing for each operating system. — Cainã Max Couto da Silva
– Cainã Max Couto da Silva, Commented Apr 8, 2018 at 3:23

Kim · Accepted Answer · 2018-04-18 01:39:03Z

2

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.

answered Apr 18, 2018 at 1:39

Kim

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1 Comment

Digvijay Sawant Over a year ago

Do you happen to know why do we need to setenv() for JAVA_HOME in R, when I had already set JAVA_HOME in system variables? Using Windows 10

Kenelm · Accepted Answer · 2019-01-23 08:29:40Z

0

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.

answered Jan 23, 2019 at 8:29

Kenelm

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