rJava install error “JAVA_HOME cannot be determined from the Registry”

Question

I am trying to load the rJava using the command:

 library(rJava)

But I get the following error:

 Error : .onLoad failed i         


        

Answer 1

Under Windows 10, first check your (running) R-Version:

R.version

If you see something like x86_64, a 64-bit version of Java is needed.

Simply downloading and installing the matching Java version (https://java.com/en/download/manual.jsp) solved the problem for me. No reinstall of R needed (as suggested by other users here). There also was no need to set the path explicitly.

Answer 2

I got the same error resolved by installing same version of R and Java i.e. 64 bits and manually updating the path i.e. ,

Sys.setenv(JAVA_HOME='C:/Program Files/Java/jre1.8.0_121') # for 64-bit version

Answer 3

Install 64 bit Java from https://java.com/en/download/manual.jsp.
Then in windows cmd run
setx PATH "C:\Program Files\Java\jre1.8.0_211\bin\server;%PATH%"
(make sure your path is correct).

Then in RStudio run
Sys.setenv(JAVA_HOME="")

Now, you should be able to run rJava!!