r - 安装软件包时，.onLoad 在 loadNamespace() 中失败( 'rJava')

Question

我有一个导入 rJava 的包“javaOnLoadFailed”(只是一个用于测试我的问题的最小包，因此有一个奇怪的名称)。当我尝试 check() 或 install() 包时，我收到“rJava”错误，即使 require(rJava) 本身工作正常。

install() 给出以下错误:

> install()
Installing javaOnloadFailed
"C:/Program Files/R/R-3.2.0/bin/x64/R" --no-site-file --no-environ --no-save  \
--no-restore CMD INSTALL  \
"C:/Projects/stackoverflow/javaOnloadFailed/javaOnLoadFailed"  \
--library="C:/Users/adb2018/Documents/R/win-library/3.2" --with-keep.source  \
--install-tests 

* installing *source* package 'javaOnloadFailed' ...
** R
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
*** arch - i386
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/adb2018/Documents/R/win-library/3.2/rJava/libs/i386/rJava.dll':
  LoadLibrary failure:  %1 is not a valid Win32 application.

Error: loading failed
Execution halted
*** arch - x64
ERROR: loading failed for 'i386'
* removing 'C:/Users/adb2018/Documents/R/win-library/3.2/javaOnloadFailed'
Error: Command failed (1)

我在 Architect 中使用 R 3.2.0，带有 sessionInfo():

R version 3.2.0 (2015-04-16)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=English_United States.1252 
[2] LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] devtools_1.7.0.9000 rj_2.0.3-2         

loaded via a namespace (and not attached):
[1] tools_3.2.0   rj.gd_2.0.0-1

Answer 1

Java环境变量为空

> Sys.getenv('JAVA')
[1] ""

基于 suggestion ，我尝试将 JAVA 环境变量设置为指向 64 位版本的 Java(因为我运行的是 R 64 位，正如您从 sessionInfo 中看到的那样，但这不起作用:

> Sys.setenv(JAVA_HOME='C:\\Program Files\\Java\\jre1.8.0_45')
> install()
Installing javaOnloadFailed
"C:/Program Files/R/R-3.2.0/bin/x64/R" --no-site-file --no-environ --no-save  \
  --no-restore CMD INSTALL  \
  "C:/Projects/stackoverflow/javaOnloadFailed/javaOnLoadFailed"  \
  --library="C:/Users/adb2018/Documents/R/win-library/3.2" --with-keep.source  \
  --install-tests 

* installing *source* package 'javaOnloadFailed' ...
** R
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
*** arch - i386
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/adb2018/Documents/R/win-library/3.2/rJava/libs/i386/rJava.dll':
  LoadLibrary failure:  %1 is not a valid Win32 application.

Error: loading failed
Execution halted
*** arch - x64
ERROR: loading failed for 'i386'
* removing 'C:/Users/adb2018/Documents/R/win-library/3.2/javaOnloadFailed'
Error: Command failed (1)

然后我尝试设置 JAVA 环境变量，使其指向我系统上的 32 位版本的 Java，然后它就可以工作了!

> Sys.setenv(JAVA_HOME='C:\\Program Files (x86)\\Java\\jre1.8.0_45\\')
> install()
Installing javaOnloadFailed
"C:/Program Files/R/R-3.2.0/bin/x64/R" --no-site-file --no-environ --no-save  \
  --no-restore CMD INSTALL  \
  "C:/Projects/stackoverflow/javaOnloadFailed/javaOnLoadFailed"  \
  --library="C:/Users/adb2018/Documents/R/win-library/3.2" --with-keep.source  \
  --install-tests 

* installing *source* package 'javaOnloadFailed' ...
** R
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
*** arch - i386
*** arch - x64
* DONE (javaOnloadFailed)

[INFO] Updating the R environment index started...

[INFO] The R environment index was updated successfully.

我不太明白为什么我需要指向 Java 32 位才能使 R 64 位工作，但情况似乎就是如此。

顺便说一句，不要无意中发现我的包名称“javaOnLoadFailed”。我刚刚创建了一个具有该名称的最小包来测试问题。