为什么 rJava 在使用 OpenJDK 7 的 Ubuntu 14.04 上不起作用？
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Why does rJava not work on Ubuntu 14.04 using OpenJDK 7?
提问by Dr. Mike
Hi I'm having issues with the rJava package from cran.
嗨，我遇到了来自 cran 的 rJava 包的问题。
I have installed
我已经安装
sudo apt-get install openjdk-7-jdk
sudo apt-get install r-cran-rjava
and ran
跑了
sudo R CMD javareconf
# Java interpreter : /usr/bin/java
# Java version : 1.7.0_55
# 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
I then try to run R and load rJava and get the following error:
然后我尝试运行 R 并加载 rJava 并收到以下错误：
R
> library(rJava)
Error : .onLoad failed in loadNamespace() for 'rJava', details:
call: dyn.load(file, DLLpath = DLLpath, ...)
error: unable to load shared object '/usr/lib/R/site-library/rJava/libs/rJava.so':
libjvm.so: cannot open shared object file: No such file or directory
Error: package or namespace load failed for ‘rJava'
I'm on Ubuntu 14.04 64 bit and am using R version 3.1.0 (2014-04-10) -- "Spring Dance"
我使用的是 Ubuntu 14.04 64 位，正在使用 R 版本 3.1.0 (2014-04-10) -- "Spring Dance"
UPDATE: Actually this is not specific to OpenJDK, I just tried oracle java 8 and got the same result. Also I found this workaround herewhich I am reluctant to use since it is indeed a workaround and doesn't really explain why it's necessary. The package system should have handled this in my opinion. Seems like libjvm.so is the problem and I have it located here
更新：实际上这不是 OpenJDK 特有的，我只是尝试了 oracle java 8 并得到了相同的结果。我也在这里找到了这个我不愿意使用的解决方法，因为它确实是一种解决方法，并没有真正解释为什么它是必要的。在我看来，包系统应该已经解决了这个问题。似乎 libjvm.so 是问题所在，我将其放在此处
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/jamvm/libjvm.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so
/usr/lib/jvm/java-7-oracle/jre/lib/amd64/server/libjvm.so
and for some reason rJava fails to find them despite updating with sudo R CMD javareconf.
并且由于某种原因，尽管使用 sudo R CMD javareconf 进行了更新，但 rJava 未能找到它们。
UPDATE 2: The plot thickens: If I run R as sudo it works.
更新 2：情节变厚：如果我将 R 作为 sudo 运行，它会起作用。
Thankful for pointers.
感谢指点。
采纳答案by persistentNoob
I had the same problem with a similar configuration (R 3.1.0, Ubuntu 12.10, 32-bit). I found the answer was in getting LD_LIBRARY_PATH set properly, as described here: error: unable to load installed packages just nowexcept that the subdirectory in question is 'client' not 'server'. So now I'm setting my environment like this:
我在使用类似的配置（R 3.1.0、Ubuntu 12.10、32 位）时遇到了同样的问题。我发现答案是正确设置 LD_LIBRARY_PATH，如下所述： 错误：刚才无法加载已安装的包，只是有问题的子目录是“客户端”而不是“服务器”。所以现在我设置我的环境是这样的：
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386
export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/i386:$JAVA_HOME/jre/lib/i386/client
回答by lapisdecor
I was able to solve this permanentelly using this answer: https://stackoverflow.com/a/25932828/3939832
我能够使用这个答案永久解决这个问题：https: //stackoverflow.com/a/25932828/3939832
This is usefull if you have Oracle java 7 or 8 installed. Exporting variables in my case was not a permanent solution. You should check what R is using as environment by doing:
如果您安装了 Oracle java 7 或 8，这将非常有用。在我的情况下导出变量不是一个永久的解决方案。您应该通过执行以下操作来检查 R 正在使用的环境：
Sys.getenv("JAVA_HOME")
and then you can use that environment by creating a java.conffile on /etc/ld.so.conf.d/as stated in the above answer link.
然后您可以通过创建上述答案链接中所述的java.conf文件来使用该环境on /etc/ld.so.conf.d/。
回答by sagarambat
you can solve this problem by opening rstudio in super user like
您可以通过在超级用户中打开 rstudio 来解决这个问题
sudo rstudio
then inside R run
然后在 R 中运行
install.packages('rJava')
回答by sourav karwa
if you are using oracle java then use following command :
如果您使用的是 oracle java，请使用以下命令：
sudo R CMD javareconf
sudo R CMD javareconf
won't help use:
不会帮助使用：
sudo R CMD javareconf **JAVA_HOME**=(path where java home is located)
回答by Ajay Jadhav
I tried many things but didnt worked. Then I tried using
我尝试了很多东西，但没有奏效。然后我尝试使用
sudo rstudio
and then
进而
install.packages('rJava')
Its working. Coool
它的工作。酷
回答by Jyoti
Installing the rJava package on Ubuntu is not quite as simple as most other R packages. Some quick notes on how to do it(Source: https://www.r-bloggers.com/installing-rjava-on-ubuntu/).
在 Ubuntu 上安装 rJava 包并不像大多数其他 R 包那么简单。关于如何做的一些快速说明（来源：https: //www.r-bloggers.com/installing-rjava-on-ubuntu/）。
Install the Java Runtime Environment (JRE).
sudo apt-get install -y default-jre
Install the Java Development Kit (JDK).
sudo apt-get install -y default-jdk
Update where R expects to find various Java files.
sudo R CMD javareconf
Install the package.
> install.packages("rJava")
If you have a RStudio session open, then exit and restart it. This is important (a running RStudio session will not pick up these changes!).
