无法为 Eclipse StatEt 插件安装 rj 包

Question

因为 Ubuntu 升级到 18.04 破坏了我的 Eclipse 配置，我重新安装了 Eclipse（Photon Release 4.8.0）并尝试再次使用 R 和 StatET 3.6 插件。根据建议 here，我尝试通过

在 R 术语控制台中安装包 rj-2.1

install.packages(c("rj", "rj.gd"), repos="http://download.walware.de/rj-2.1")

这开始安装 rj 和 rj.gd

Installing packages into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)

但以错误消息结尾：

Warning message:
In install.packages(c("rj", "rj.gd"), repos = "http://download.walware.de/rj-2.1") :
  installation of package ‘rj’ had non-zero exit status

仔细查看控制台输出会发现此错误消息：

checking Java support in R... configure: error: cannot determine complete java config
    JAVA_HOME: /usr/lib/jvm/default-java
    JAVA     : /usr/lib/jvm/default-java/bin/java
    JAVAC    : /usr/lib/jvm/default-java/bin/javac
    JAVAH    : 
    JAVA_CPPFLAGS: -I/usr/lib/jvm/default-java/include -I/usr/lib/jvm/default-java/include/linux
    JAVA_LIBS: -L/usr/lib/jvm/default-java/lib/server -ljvm
    JAR      : /usr/lib/jvm/default-java/bin/jar
R is not configured with full Java support. Please make sure
an JDK is installed and run
    R CMD javareconf
as root to add Java support to R.

If you don't have root privileges, run
    R CMD javareconf -e
to set all Java-related variables and then install the package.
ERROR: configuration failed for package ‘rj’
* removing ‘/usr/local/lib/R/site-library/rj’
* restoring previous ‘/usr/local/lib/R/site-library/rj’

当我运行建议的命令

sudo R CMD javareconf

在终端中，输出表明它按预期工作

Java interpreter : /usr/lib/jvm/default-java/bin/java
Java version     : 10.0.2
Java home path   : /usr/lib/jvm/default-java
Java compiler    : /usr/lib/jvm/default-java/bin/javac
Java headers gen.: 
Java archive tool: /usr/lib/jvm/default-java/bin/jar

trying to compile and link a JNI program 
detected JNI cpp flags    : -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux
detected JNI linker flags : -L$(JAVA_HOME)/lib/server -ljvm
gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG -I/usr/lib/jvm/default-java/include -I/usr/lib/jvm/default-java/include/linux     -fpic  -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g  -c conftest.c -o conftest.o
g++ -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o conftest.so conftest.o -L/usr/lib/jvm/default-java/lib/server -ljvm -L/usr/lib/R/lib -lR


JAVA_HOME        : /usr/lib/jvm/default-java
Java library path: $(JAVA_HOME)/lib/server
JNI cpp flags    : -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux
JNI linker flags : -L$(JAVA_HOME)/lib/server -ljvm
Updating Java configuration in /usr/lib/R
Done.

尽管如此，安装rj-2.1之后仍然出现同样的错误信息。我看了看 /usr/local/lib/R/site-library 并且 rj.gd 更新了，但是 rj 仍然是以前的版本。启动 R 控制台会产生错误消息

eclipse.buildId=4.8.0.I20180611-0500
java.version=10.0.2
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_GB
Framework arguments:  -product org.eclipse.epp.package.java.product
Command-line arguments:  -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

de.walware.statet.r.console.ui

Launching the R Console was cancelled, because it seems starting the R engine failed.
Please make sure that R package 'rj' (2.1 or compatible) is installed and that the R library paths are set correctly for the R environment configuration

知道如何安装 rj 吗？

P.S.: 好像是Java版本问题。 Ubuntu 18.04 预装了这个版本：

openjdk 10.0.2 2018-07-17
OpenJDK Runtime Environment (build 10.0.2+13-Ubuntu-1ubuntu0.18.04.1)
OpenJDK 64-Bit Server VM (build 10.0.2+13-Ubuntu-1ubuntu0.18.04.1, mixed mode)

更新：
在没有故意更改任何内容的情况下，从 Rterm 控制台安装 rj 和 rj.gd 现在可以正常工作了。 /usr/local/lib/R/site-library中的文件确实更新了，Rterm控制台没有任何错误信息。
尽管如此，在创建和运行一个 RJ 控制台时，会出现相同的错误消息

Launching the R Console was cancelled, because it seems starting the R engine failed. 
Please make sure that R package 'rj' (2.1 or compatible) is installed and that the R library paths are set correctly for the R environment configuration 'Rstatet36'.

我又定义了Preferences>Statet>R environment和Run Configurations也没用

更新：如果您对问题投反对票，最好添加评论，说明您为什么这样做，以便改进问题。或删除。那好吧。

Answer 1

确实是Java环境不对。安装时间不长，如果你知道，该怎么做，但查找起来相当繁琐：

1) 使用 sudo apt install openjdk-8-jdk 在 Ubuntu 18.04 上安装 openjdk 8。我认为简单地将默认的 Java 版本更改为 sudo update-alternatives --config java 可能会有所帮助，但事实并非如此。所以不要这样做。

2) 转到 Eclipse>首选项>Java>已安装的 JRE：选择 ADD 并指定文件夹，在本例中为 /usr/lib/jvm/java-8-opdenjdk-amd64。单击“确定”。

3) 转到运行>运行配置并双击 R console 打开一个新的运行配置。选择RJ (default)

4) 转到选项卡 JRE 并从 Alternate JRE 中选择 Java 8

5) 为您的新配置起一个好听的名字，单击 Apply 和 Run 然后您的 RJ 控制台将启动。至少在我的环境中是这样。

无法为 Eclipse StatEt 插件安装 rj 包

Not able to install rj package for Eclipse StatEt plugin

java

eclipse

ubuntu

r

statet