Using the rJava package on Win7 64 bit with R

Question

I m trying to install rJava on a computer with Win 7 64 bit  When I run  install packages  rJava     everything seems to be fine   Installing package s  into    C  Users djq Documents R win-library 2 13     as    lib    is unspecified  trying URL  http   software rc fas harvard edu mirrors R bin windows contrib 2 13 rJava 0 9-1 zip  Content type  application zip  length 654936 bytes  639 Kb  opened URL downloaded 639 Kb  package  rJava  successfully unpacked and MD5 sums checked  The downloaded packages are in     C  TEMP RtmpW2eAUw downloaded packages   but when I tried to load the library library rJava  I get the following 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 me Documents R win-library 2 13 rJava libs x64 rJava dll     LoadLibrary failure    1 is not a valid Win32 application   Error  package namespace load failed for  rJava    I have installed  the Java JRE  trying both 32 and 64 bit versions  and the JDK  using both 32 and 64 bit   My R version is R version 2 13 1  2011-07-08  and I m using RStudio    If I try using 32 bit R  I can load rJava fine  Is the problem just that rJava does not run in R 64 bit  How can I tell if a package is just for 32 instead of 64     edit  just posted R version      gt  R Version    platform  1   x86 64-pc-mingw32    arch  1   x86 64    os  1   mingw32    system  1   x86 64  mingw32    status  1       major  1   2    minor  1   13 1    year  1   2011    month  1   07    day  1   08     svn rev   1   56322    language  1   R    version string  1   R version 2 13 1  2011-07-08

User · Answer

Download Java from https   java com en download windows-64bit jsp for 64-bit windows Install it Download Java development kit from https   www oracle com technetwork java javase downloads jdk8-downloads-2133151 html for 64-bit windows install it Then right click on    This PC    icon in desktop Properties Advanced system settings Advanced Environment Variables Under System variables select Path Click Edit Click on New Copy and paste paths    C  Program Files Java jdk1 8 0 201 bin    and    C  Program Files Java jre1 8 0 201 bin     without quote   OK OK OK   Note  jdk1 8 0 201 and jre1 8 0 201 will be changed depending on the version of Java development kit and Java   In Environment Variables window go to User variables for User Click on New Put Variable name as    JAVA HOME    and Variable value as    C  Program Files Java jdk1 8 0 201 bin    Press OK   To check the installation  open CMD Type javac Press Enter and Type java press enter It will show   In RStudio run  Sys setenv JAVA HOME  C   Program Files  Java  jdk1 8 0 201     Note  jdk1 8 0 201 will be changed depending on the version of Java development kit  Now you can install and load rJava package without any problem

User · Answer

I need to have a 32 bit JRE available for my browser  but 64 bit JRE for R and rJava   The 32 bit JRE is installed in the default location   After some experimentation  I found that I only needed one of misterbee s suggestions to get rJava  version 0 9-6  working for me   All I did was add the path to my 64 bit java installation   C  apps Java jre bin server jvm dll   to the top of my path environment variable  your path will likely be different  and remove my JAVA HOME as user2161065 suggested   I put this just ahead of the entry  C  ProgramData Oracle Java javapath   which the Oracle installer inserts at the top of the path and points to some symlinks to the 32 bit JRE   By adding the entry to 64 bit jvm dll  looks like rJava could find what it needs

User · Answer

I had some trouble determining the Java package that was installed when I ran into this problem  since the previous answers didn t exactly work for me  To sort it out  I typed   Sys setenv JAVA HOME  C  Program Files Java    and then hit tab and the two suggested directories were  jre1 8 0 31   and  jre7    Jre7 didn t solve my problem  but jre1 8 0 31  did  Final answer was running  before library rJava     Sys setenv JAVA HOME  C  Program Files Java jre1 8 0 31      I m using 64-bit Windows 8 1 Hope this helps someone else   Update   Check your version to determine what X should be  mine has changed several times since this post    Sys setenv JAVA HOME  C  Program Files Java jre1 8 0 x

User · Answer

Update  July 2018    The latest CRAN version of rJava will find the jvm dll automatically  without manually setting the PATH or JAVA HOME  However note that    To use rJava in 32-bit R  you need Java for Windows x86 To use rJava in 64-bit R  you need Java for Windows x64 To build or check R packages with multi-arch  the default  you need to  install both Java For Windows x64 as well as Java for Windows x86  On Win 64  the former installs in C  Program files Java  and the latter in C  Program Files  x86  Java  so they do not conflict    As of Java version 9  support for x86  win32  has been discontinued  Hence the latest working multi-arch setup is to install both jdk-8u172-windows-i586 exe and jdk-8u172-windows-x64 exe and then the binary package from CRAN    install packages  rJava     The binary package from CRAN should pick up on the jvm by itself  Experts only  to build rJava from source  you need the --merge-multiarch flag   install packages  rJava   type    source   INSTALL opts  --merge-multiarch       Old anwser    Note  many of folks in other answers comments have said to remove JAVA HOME  so consider that  I have not revisited this issue recently to know if all the steps below are still necessary    Here is some quick advice on how to get up and running with R   rJava on Windows 7 64bit  There are several possibilities  but most have fatal flaws  Here is what worked for me   Add jvm dll to your PATH  rJava  the R lt - Java bridge  will need jvm dll  but R will have trouble finding that DLL  It resides in a folder like  C  Program Files Java jdk1 6 0 25 jre bin server   or   C  Program Files Java jre6 jre bin client   Wherever yours is  add that directory to your windows PATH variable   Windows -   Path  -   Edit environment variables to for your account  -  PATH -  edit the value    You may already have Java on your PATH  If so you should find the client server directory in the same Java  home  dir as the one already on your PATH   To be safe  make sure your architectures match If you have Java in Program Files  it is 64-bit  so you ought to run R64  If you have Java in Program Files  x86   that s 32-bit  so you use plain 32-bit R   Re-launch R from the Windows Menu  If R is running  quit   From the Start Menu   Start R   RGUI  RStudio  This is very important  to make R pick up your PATH changes   Install rJava 0 9 2   Earlier versions do not work   Mirrors are not up-to-date  so go to the source at www rforge net  http   www rforge net rJava files   Note the advice there     Please use   install packages  rJava    http   www rforge net      to install       That is almost correct  This actually works   install packages  rJava    libPaths   1    http   www rforge net     Watch the punctuation  The mysterious     libPaths   1      just tells R to install the package in the primary library directory  For some reason  leaving the value blank doesn   t work  even though it should default

User · Answer

I think this is an update   I was unable to install rJava  on Windows  until I installed the JDK  as per  Javac is not found and javac not working in windows command prompt   The message I was getting was   javac  is not recognized as an internal or external command  operable program or batch file    The JDK includes the JRE  and according to  https   cran r-project org web packages rJava index html the current version  0 9-7 published 2015-Jul-29  of rJava  SystemRequirements      Java JDK 1 2 or higher  for JRI REngine JDK 1 4 or higher   GNU make   So there you are  if rJava won t install because it can t find javac  and you have the JRE installed  then try the JDK   Also  make sure that JAVA HOME points to the JDK and not the JRE

User · Answer

I solved the issue by uninstalling apparently redundant Java software from my windows 7 x64 machine  I achieved this by first uninstalling all Java applications and then installing a fresh Java version   Later I pointed R 3 4 3 x86 64-w64-mingw32 to the Java path  just to mention though I don t think this was the real issue   Today only Java 8 Update 161  64-bit  8 0 1610 12 was left then  After this  install packages  rJava    library rJava  did work perfectly

User · Answer

Getting rJava to work depends heavily on your computers configuration    You have to use the same 32bit or 64bit version for both  R and JDK JRE  A mixture of this will never work  at least for me   If you use 64bit version make sure  that you do not set JAVA HOME as a enviorment variable  If this variable is set  rJava will not work for whatever reason  at least for me   You can check easily within R is JAVA HOME is set with  Sys getenv  JAVA HOME      If you need to have JAVA HOME set  e g  you need it for maven or something else   you could deactivate it within your R-session with the following code before loading rJava   if  Sys getenv  JAVA HOME          Sys setenv JAVA HOME     library rJava    This should do the trick in most cases  Furthermore this will fix issue Using the rJava package on Win7 64 bit with R  too  I borrowed the idea of unsetting the enviorment variable from R  rJava package install failing

User · Answer

For me  setting JAVA HOME did the trick  instead of unsetting  as in another answer given here   Either in Windows   set JAVA HOME  C  Program Files Java jre7     Or inside R   Sys setenv JAVA HOME  C   Program Files  Java  jre7       But what s probably the best solution  since rJava 0 9-4  is overriding within R the Windows JAVA HOME setting altogether   options java home  C   Program Files  Java  jre7     library rJava

User · Answer

This is a follow-up to Update  July 2018   I am on 64 bit Windows 10 but am set up to build r packages from source for both 32 and 64 bit with Rtools  My 64 bit jdk is jdk-11 0 2  When I can  I do everything in RStudio  As of March 2019  rjava is tested with  lt  jdk11  see github issue  157    Install jdks to their default location per Update  July 2018  by  Jeroen  In R studio  set JAVA HOME to the 64 bit jdk      Sys setenv JAVA HOME  C  Program Files Java jdk-11 0 2      Optionally check your environmental variable      Sys getenv  JAVA HOME      Install the package per the github page recommendation      install packages  rJava    http   rforge net     FYI  the rstudio scripting console doesn t like the double commas    but it works

User · Answer

I had a related problem with rJava  It would load but a package that depends on it  would not load   Users may waste a lot of time with jvm dll and PATH and JAVA HOME when the real fix is to force the installer to just forget about i386  Use option for install packages   this also works when drat library is used   credit goes to Dason   install packages  SqlRender  INSTALL opts  --no-multiarch     Also  you can modify just your user path with a win command like this   setx PATH  C  Program Files Java jre1 8 0 102 bin server  PATH

User · Answer

The last question has an easy answer    gt   Machine sizeof pointer  1  8   Meaning I am running R64  If I were running 32 bit R it would return 4  Just because you are running a 64 bit OS does not mean you will be running 64 bit R  and from the error message it appears you are not    EDIT  If the package has binaries  then they are in separate directories  The specifics will depend on the OS  Notice that your LoadLibrary error occurred when it attempted to find the dll in    rJava libs x64       On my MacOS system the    rJava libs      folder has 3 subdirectories  i386  ppc  and x86 64   The ppc files are obviously useless baggage

User · Answer

Sorry for necro  I have too run into the same issue and found out that rJava expects JAVA HOME to point to JRE  If you have JDK installed  most probably your JAVA HOME points to JDK  My quick solution   Sys setenv JAVA HOME paste Sys getenv  JAVA HOME     jre   sep

[r] Using the rJava package on Win7 64 bit with R

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