Installation of rJava
Here is link on R-Bloggers that worked for me: https://www.r-bloggers.com/installing-rjava-on-ubuntu/
sudo apt-get install -y default-jre
sudo apt-get install -y default-jdk
sudo R CMD javareconf
install.packages("rJava")
You don't seem to have JDK installed. You will need at least
sudo apt-get install openjdk-7-jdk
then re-run
sudo R CMD javareconf
Make sure you do NOT set JAVA_HOME
by hand - it will be detected automatically. You should then see something like this:
$ sudo R CMD javareconf
Java interpreter : /usr/bin/java
Java version : 1.7.0_91
Java home path : /usr/lib/jvm/java-7-openjdk-amd64/jre
Java compiler : /usr/bin/javac
Java headers gen.: /usr/bin/javah
Java archive tool: /usr/bin/jar
trying to compile and link a JNI program
detected JNI cpp flags : -I$(JAVA_HOME)/../include
detected JNI linker flags : -L$(JAVA_HOME)/lib/amd64/server -ljvm
gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG -I/usr/lib/jvm/java-7-openjdk-amd64/jre/../include -fpic -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -g -c conftest.c -o conftest.o
gcc -std=gnu99 -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o conftest.so conftest.o -L/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server -ljvm -L/usr/lib/R/lib -lR
JAVA_HOME : /usr/lib/jvm/java-7-openjdk-amd64/jre
Java library path: $(JAVA_HOME)/lib/amd64/server
JNI cpp flags : -I$(JAVA_HOME)/../include
JNI linker flags : -L$(JAVA_HOME)/lib/amd64/server -ljvm
What is wrong with sudo apt-get install r-cran-rjava
?
See for example this earlier answer and the question / thread around it.
For an installation from scratch, you could still much worse than starting from sudo apt-get build-dep r-cran-rjava
. It will get you the JDK corresponding to your Ubuntu version.
First i would recommend installing Rstudio from its website: https://www.rstudio.com/products/rstudio/download/ (i.e. Rstudio 64bit: https://download1.rstudio.org/rstudio-0.99.489-amd64.deb). This does not solve the problem directly, but it helps to avoid other bugs with Rstudio.
Regarding the error, trying to make sure you have JDK install. I don't think the command java -version
can tell if JDK is installed. You have to check the package of JDK itself, or based on the error message, do this:
locate jni.h
The output should match or compatible with your JAVAHOME, e.g:
/usr/lib/jvm/java-7-openjdk-amd64/include/jni.h
/usr/lib/jvm/java-7-oracle/include/jni.h
Update 1:
R CMD javareconf
is looking for the jni.h
file under $(JAVA_HOME)/include
You have JDK installed, but it is very likely that you are having default java to a JRE directory, that why the error happened.
You can see where default-java
is really pointing to by doing this command:
jRealDir=$(readlink -f /usr/lib/jvm/default-java)
echo $jRealDir
# sample correct output: /usr/lib/jvm/jdk1.8.0_65
# or /usr/lib/jvm/java-8-oracle if you default to Oracle's
# now check jni.h
ls -l $jRealDir/include/jni.h
# sample expected output:
# /usr/lib/jvm/jdk1.8.0_65/include/jni.h
If the ls
command failed, you have to setup so that javareconf
( and later rJava
) can use the java from JDK not from JRE. You have two options:
Method 1: Do it system-wide
This is convenient, but may effect other program like the one you mentioned jmol
. But don't worry, this is revertible, just re-run the command and pick the old one. Do the following command and pick the dir that has JDK:
sudo update-alternatives --config java
After that test how jmol
works, if it works alright then congrat. You are now ready to test rJava. If not, try the second method below
Method 2: Do it for R only
put this in the .Rprofile
under your home directory
Sys.setenv(JAVA_HOME = '/usr/lib/jvm/jdk1.8.0_65')
# this set JAVA_HOME for R to correct java home dir.
After updating or creating the .Rprofile
DO restart R in Rstudio. The R CMD javareconf
may still fail in this case, but it should be OK if you run it from Shell
under Tools
menu of Rstudio.
Regarding the installing or Rstudio from Ubuntu's stock repo. It would not make a difference for getting rJava
running. Then again, I recommend installing Rstudio for its homepage because new version also has some nice features (i.e. better autocompletion, which I like the most).