在 MacOSX 上安装 `rJava` 失败并显示“JDK 不完整！...”

Question

I am trying to install rJava on my Mac but I get the following error message:

[...]
checking whether javah was replaced by javac -h... no
configure: error: one or more Java tools are missing.

*** JDK is incomplete! Please make sure you have a complete JDK. JRE is *not* sufficient.
configure: error: ./configure failed for jri
ERROR: configuration failed for package ‘rJava’
* removing ‘/usr/local/lib/R/3.6/site-library/rJava’
Warning in install.packages :
  installation of package ‘rJava’ had non-zero exit status

However, I have java and javac so I don't simply have a JRE:

$ java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_242-b08)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.242-b08, mixed mode)
$ javac -version
javac 1.8.0_242

I am however slightly bothered by the line

JAVA_HOME        : /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/jre 

in R CMD javareconf . Because it ends with jre. Is that part of my problem?

I have done some googling but I have not found much. For example the last comment on https://github.com/su/rJava/issues/146 is not promising.

What should I do to be able ro run rJava ?

Answer 1

As the error suggests, it is finding the JRE as your JAVA_HOME . Just set JAVA_HOME to point to JDK, something like:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/

Then try to install rJava , if that is working you can add the export in your profile startup files.

Answer 2

1. Download and install jdk-8u251-macosx-x64.dmg from https://www.oracle.com/java/technologies/javase-jdk8-downloads.html

2. setup JAVA_HOME