Problems when trying to load a package in R due to rJava
The reason is probably linked to the fact you are using a 64-bit OS and R version but do not have Java installed with the same architecture.What you have to do is to download Java 64-bit from this page: https://www.java.com/en/download/manual.jsp
After that just try to reload the xlsx package. You shouldn't need to re-start R.
Its because either one of the Java versions(32 bit/64 bit) is missing from your computer. Try installing both the Jdks and run the code.
After installing the Jdks open R and type the code
system("java -version")This will give you the version of Jdk installed. Then try loading the rJava package. This worked for me.
I had a similar problem what worked for me was to set JAVA_HOME. I tired it first in R:
Sys.setenv(JAVA_HOME = "C:/Program Files/Java/jdk1.8.0_101/")And when it actually worked I set it in
System Properties -> Advanced -> Environment Variables
by adding a new System variable. I then restarted R/RStudio and everything worked.