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Asked: 2026-05-25T21:19:20+00:00

I am developing a program that calls R functions from Java using JRI/rJava. I

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I am developing a program that calls R functions from Java using JRI/rJava. I was coding the program in NetBeans on another machine, which was working fine (i.e. able to run the code). I have since then moved to another machine and have been running into problems.

The exact error message I am seeing is this:

Cannot find JRI native library!
Please make sure that the JRI native library is in a directory listed in java.library.path.
java.lang.UnsatisfiedLinkError: E:\R\R-2.13.1\library\rJava\jri\jri.dll: The specified path is invalid
    at java.lang.ClassLoader$NativeLibrary.load(Native Method)
    at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1807)
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1732)
    at java.lang.Runtime.loadLibrary0(Runtime.java:823)
    at java.lang.System.loadLibrary(System.java:1028)
    at org.rosuda.JRI.Rengine.<clinit>(Rengine.java:19)
    at com.rjava.test.rtest.main(rtest.java:64)
Java Result: 1

I have read the FAQs for JRI/rJava, and have been scouring the internet for fixes, but have made no progress. Here is what I have done so far:

  • Created an environment variable called R_HOME: “E:\R\R-2.13.1”
  • Added “%R_HOME%\bin\x64” to the PATH environment variable
  • Added “%R_HOME%\library\rJava\JRI” to the PATH environment variable (this is where jri.dll is located)
  • Set the required jar files as compile time libraries (JRI.jar, JRIEngine.jar, REngine.jar) in NetBeans
  • set the following VM options in NetBeans: : -Djava.library.path=E:\R\R-2.13.1\library\rJava\jri (This is where jri.dll is located)

I have restarted my computer to make sure that the changes stick.

To make sure I configured things correctly, I ran the following in the command line:

java -cp E:\R\R-2.13.1\library\rJava\jri\JRI.jar;E:\R\R-2.13.1\library\rJava\jri\examples rtest

And the example java files ran fine. I’m beginning to think my new machine just hates me.

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1 Answer

  1. Editorial Team

    The message indicates that it the path E:\R\R-2.13.1\library\rJava\jri\jri.dll is invalid. Are you sure that path exists? Also, is E a mapped drive that is mapped to a path that has spaces in it? I’m not sure if the spaces are the issue, but it eliminates one issue. I would try just putting the dll in C:\ or somewhere very simple and seeing if it can find it there as a simple test.

    Also verify that the -Djava.library.path is being passed as you think it is (you can check that with visualvm or jconsole).

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