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 package into ‘C:/Users/sony/Documents/R/win-library/3.1’
    (as ‘lib’ is unspecified)
    --- Please select a CRAN mirror for use in this session ---
    trying URL 'http://cran.utstat.utoronto.ca/bin/windows/contrib/3.1/rJava_0.9-6.zip'
    Content type 'application/zip' length 758898 bytes (741 Kb)
    opened URL
    downloaded 741 Kb

package ‘rJava’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
        C:\Users\sony\AppData\Local\Temp\RtmpamYUH7\downloaded_packages

I get an error while loading the package:

library(rJava)
Error in get(Info[i, 1], envir = env) : 
  lazy-load database 'C:/Users/sony/Documents/R/win-library/3.1/rJava/R/rJava.rdb' is corrupt
In addition: Warning message:
In get(Info[i, 1], envir = env) : internal error -3 in R_decompress1
Error: package or namespace load failed for ‘rJava’

I know that I am working on R-64 bit and at same time the environment variable Path is set to:

C:\Program Files\Java\jdk1.7.0_51\bin;C:\Program Files\Java\jre7\bin\server;

also, so the Java version is 64 bit too. I don't understand the reason behind the error.

On manually setting through R:

options(java.home="C:\\Program Files\\Java\\jdk1.7.0_51\\bin")
library(rJava)

I get this error:

Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: inDL(x, as.logical(local), as.logical(now), ...)
  error: unable to load shared object 'C:/Users/sony/Documents/R/win-library/3.1/rJava/libs/x64/rJava.dll':
  LoadLibrary failure:  The specified module could not be found.

Error: package or namespace load failed for ‘rJava’

Any advice? The error seems to have cropped up after I uninstalled some old version of Java.

OTHERS: Also just to add, I do not set JAVA_HOME as a environment variable.

Uninstalling and Reinstalling R also doesn't seem to fix the problem.

Removing older java versions is too of no help.

Answer 1

Faced similar error message.

Tried a few steps listed here.

1. Set Env. Variable, JAVA_HOME. => Didn't work.
2. Tried to install rJava +> Didn't work Steps 3,4,5 worked..
3. Updated my Java 64 bit version 8.xx (latest available)
4. install.packages(rJava) ==> Success
5. install.packages(RWeka) ==> Success

Answer 2

Use:

Sys.setenv(JAVA_HOME='...path to JRE...')

e.g.

Sys.setenv(JAVA_HOME='C:\\Program Files\\Java\\jdk1.7.0_51\\jre')

Your environment variable is wrong.

Answer 3

I got a similar error:

> library(rJava)
Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: inDL(x, as.logical(local), as.logical(now), ...)
  error: unable to load shared object 'C:/program files/R/R-3.1.2/library/rJava/libs/x64/rJava.dll':
  LoadLibrary failure:  The specified module could not be found.

My JAVA_HOME was pointing to JDK, rather than JRE.

> Sys.getenv("JAVA_HOME")
[1] "c:\\java\\jdk1.7.0_55"
> Sys.setenv(JAVA_HOME="c:\\java\\jdk1.7.0_55\\jre")

I could now load rJava and xlsx in R.

Answer 4

It is probably the issue with the setting with the JAVA_HOME pointer. In case you do not have JDK but JRE, here is you might have to do: Sys.setenv(JAVA_HOME='C:\Program Files\Java\jre1.8.0_161')

Remember to change the numbers after "jre" based on what you have on your computer. Here is a link that explains the difference between JDK and JRE.

Answer 5

I've met a similar problem and spent an entire day to get it fixed. Although my computer, windows7, and Rstudio are 64 bit, but my Java is 32 bit(!) Once I realized that, I download a 64 bit Java. I have to manually download, the automatic download will lead to the 32 bit version because my chrome browser is 32 bit. 64 bit Java will be automatically installed in

C:\Program Files\Java, however, 32 bit Java will be automatically installed in C:\Program Files (x86) \Java.

This is an important indicator telling me my Java is 64 bit or 32 bit.

After installing the 64 bit Java, everything works perfect!

Answer 6

Try downloading the RStudio daily build: http://dailies.rstudio.com

It worked for me on the second try after I tried everything else (updated R, Rstudio, Java, reinstalled rJava a million times, and followed all the stackoverflow advice).

The tip came from the RStudio support forums:

RStudio is indeed failing to read some of the start-up information normally provided by R here...

We have a potential fix for this in the latest daily builds of RStudio -- if you're willing, you can try downloading and testing from http://dailies.rstudio.com