Unable to load rJava on R

Question

I wish to load rJava in R x64 3.1.2. OS- Windows 8.1 64 bit

Though installation seems to work fine:

  > install.packages(\"rJava\")
    Installing         


        

Answer 1

I get this error every time Java sneaks an update onto my PC. When I go:

Sys.getenv("Path")

I find something in the output which looks like

C:\\Program Files \\Java\\jre1.8.0_112\\bin\\server\\

where the last few digits of the jre subfolder are outdated.

To fix this everywhere, you might want to edit the Windows environment variable. Do this by going WINDOWS + X key, selecting Command Prompt (Admin) from the menu, and typing

rundll32.exe sysdm.cpl,EditEnvironmentVariables

in the command box. This will call up this dialog box with edit rights for the PATH variable (and other system variables):

The Windows interface for editing long environment variables is a bit unwieldy, so after I click Edit... I like to copy-paste the resulting mess of paths to Notepad.exe, do the work there, and copy-paste back.